Honeywell T8665C Thermostat User Manual

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T8665C,D,E EnergyPro™ Thermostat  
OWNER’S GUIDE  
®
U.S. Registered Trademark  
Copyright © 2003 Honeywell International Inc.  
All Rights Reserved  
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Contents  
Introduction ....................................................................................................................................  
3
4
7
Using this Guide ............................................................................................................................  
Thermostat Features .....................................................................................................................  
Operating Your Thermostat ........................................................................................................... 11  
Setting the Clock ........................................................................................................................... 12  
Programming Your Thermostat ..................................................................................................... 25  
Replacing the Batteries (T8665C Only) ......................................................................................... 38  
Adaptive Intelligent Recovery™ Control ........................................................................................ 40  
Troubleshooting (Table 3) .............................................................................................................. 43  
Warranty ........................................................................................................................................ 50  
Customer Assistance .................................................................................................................... 51  
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Although the EnergyPro™ Thermostat can be  
used standalone, it is intended to be part of a  
communicating system provided by your  
Energy Utility.  
INTRODUCTION  
Congratulations on purchasing your new  
EnergyPro™ Thermostat. This exciting new  
product is designed to add a new level of  
service, energy savings and convenience to  
your home comfort system. As part of a larger  
system of products and services from your  
Energy Utility, your new thermostat allows you  
to take advantage of special programs offered  
through your Energy Utility. These programs  
allow you to further increase your energy  
savings beyond the efficiency of a traditional  
programmable thermostat.  
Read this document thoroughly to take  
advantage of the convenience and energy  
saving benefits of using this product.  
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USING THIS GUIDE  
Keyboard and Display Description  
The T8665C,D,E Communicating Thermostat  
uses two-way radio frequency (RF) to send and  
receive information. This information can be  
used to make changes to your thermostat  
settings, or settings from your Energy Utility.  
Keyboard  
The keyboard is located behind the thermostat  
cover. Three frequently used keys: increase ,  
decrease , and i key are located next to the  
display. See Fig. 1.  
The following symbols will help you identify the  
features that apply to your system:  
Display  
The thermostat displays important information  
such as day, time, schedule period,  
temperature, filter information, system and fan  
operation. See Fig. 2.  
 Tip symbol. Look for helpful  
tips throughout this guide  
when you see this symbol.  
WARNING: This product operates under  
provisions of Part 15 of the FCC Rules.  
Modifications to this product not specifically  
authorized by Honeywell may void the user’s  
authority to operate this device.  
– Compressor with the word,  
Heat Pump, below.These  
features are availble when  
used with a heat pump.  
HEAT PUMP  
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TIME  
/ TIME  
WAKE  
SET WAKE TIMES AND  
TEMPERATURES  
LEAVE  
SET LEAVE TIMES AND  
TEMPERATURES  
DIGITAL  
DISPLAY  
INCREASE  
SETS TIME  
RAISES TEMPERATURE SETTING  
FORWARD OR BACK  
DECREASE  
LOWERS TEMPERATURE SETTING  
SET CURRENT DAY/TIME  
SETS CURRENT  
DAY AND TIME  
INFORMATION  
DISPLAYS CURRENT HEAT/COOL  
TEMPERATURE SETTING, FILYER  
STATUS, AND OUTDOOR  
RUN PROGRAM  
RETURNS THERMOSTAT TO  
NORMAL OPERATING MODE.  
TEMPERATURE (WHEN INSTALLED).  
PRESS AND HOLD TO CANCEL  
ENERGY SAVINGS AND  
PRE-HEAT/PRE-COOL MODES  
RETURN  
SET RETURN TIMES AND  
TEMPERATURES  
(MY CHOICE).  
Run  
Set Current  
Leave  
Set Program  
Filter  
SLEEP  
SET SLEEP TIMES AND  
TEMPERATURES  
DAY  
Program  
Day/Time  
Wake  
Return  
Sleep  
Fan  
SETS DAY OF THE WEEK  
Time  
Copy  
Heat/Cool  
Settings  
HOLD TEMP  
Hold Temp  
Day  
System  
PROGRAM SCHEDULING  
WAKE LEAVE RETURN SLEEP  
ENTERS PROGRAMMING MODE  
SETS A HOLD TEMPERATURE  
SETTING AND ACTIVATES  
VACATION HOLD FEATURE  
Daylight  
Time  
FAN  
DAYLIGHT TIME  
SELECTS AUTO/ON  
SELECTS STANDARD TIME  
OR DAYLIGHT SAVING TIME  
SYSTEM  
SELECTS HEAT/OFF/COOL (AUTO)  
COPY  
COPIES SETTINGS FROM ONE DAY TO  
HEAT/COOL SETTINGS  
SWITCHES BETWEEN HEAT SETPOINTS AND  
COOL SETPOINTS WHILE PROGRAMMING  
FILTER  
ANOTHER DAY FOR QUICKPROGRAMMING  
SELECTS FILTER TIMER REMINDER  
PERIOD (0, 15, 30, 60, 90, 120 DAYS)  
M20893A  
Fig. 1. Thermostat keyboard description.  
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SHOWS WHEN  
THERMOSTAT  
IS IN THE  
PROGRAMMING  
MODE  
SHOWS  
THERMOSTAT  
IS IN THE  
SET CURRENT  
DAY/TIME MODE  
SHOWS  
SHOWS TEMPERATURE  
DISPLAYED IS THE CURRENT  
SET TEMPERATURE  
TEMPERATURE  
SETTING CHANGED  
FOR THIS  
PROGRAM  
PERIOD  
SHOWS ACTIVE  
PRICE TIER  
SHOWS THAT THERMOSTAT  
IS CALLING FOR  
(HIGH, MEDIUM OR LOW)  
System  
SHOWS CRITICAL  
PRICE TIER IS ACTIVE  
HiMedLo Set Program Set Day/Time Temporary Setting  
Critical  
Hold for  
AM  
SHOWS VACATION  
HOLD DURATION  
SHOWS CURRENT  
SYSTEM KEY POSITION  
HEAT/OFF/COOL  
Em Heat  
Off Wait  
SHOWS FILTER TIMER  
EXPIRED (TIME TO  
REPLACE FILTER)  
Filter Em Ht Aux Ht Days  
Fan  
SHOWS CURRENT FAN  
KEY POSITION ON/AUTO  
MonTueWedThuFriSat Sun Repl Batt Room  
Wake Leave Return Sleep Recovery DST  
On  
Auto  
SHOWS CURRENT  
DAY OR DAYS BEING  
PROGRAMMED  
SHOWS BATTERIES  
NEED REPLACING  
SHOWS SMART  
RESPONSE IS OFF  
AND CONVENTIONAL  
RECOVERY IS ON  
SHOWS ADAPTIVE  
INTELLIGENT RECOVERY  
IS IN EFFECT  
SHOWS CURRENT  
PROGRAM PERIOD  
OR PERIOD BEING  
PROGRAMMED  
TM  
SHOWS THERMOSTAT IS  
CALLING FOR THE FAN  
SHOWS SYSTEM ON  
DAYLIGHT SAVING TIME  
SHOWS THERMOSTAT  
IS COMMUNICATING  
SUCCESSFULLY  
DISPLAYS EITHER ROOM  
OR SET TEMPERATURE  
DISPLAYS  
EITHER CURRENT  
TIME OF DAY OR  
PROGRAM TIMES  
SHOWS TEMPERATURE  
DISPLAYED IS THE CURRENT  
ROOM TEMPERATURE  
M20894  
Fig. 2. Example of thermostat display.  
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Set the filter indicator (0, 15, 30, 60, 90, or  
120 days) to remind you to change the  
THERMOSTAT FEATURES  
filter.  
Adaptive Intelligent Recovery™ Control  
Information at the press of a button—use  
the i (information) key to see the outdoor  
temperature (C7089B Outdoor Temper-  
ature Sensor optional accessory), the  
current setpoints, or the filter status.  
for comfort and energy savings.  
Customize the program schedule—  
program your own schedule to fit your  
needs.  
Temporary schedule override—set the  
thermostat higher or lower for the current  
program schedule.  
Daylight Time key for quick time changes  
between Daylight and Standard time.  
Backlit display for improved readability  
Permanent schedule override—set the  
(press any key to activate).  
thermostat higher or lower indefinitely.  
Optional outdoor temperature display—  
ask your installer to install an outdoor  
temperature sensor to activate this  
feature.  
Vacation mode (1 to 255 days) for added  
comfort and energy savings. Set the  
temperature higher or lower for energy  
savings while on vacation. At the same  
time, set the comfort level you want when  
you return.  
For additional features, see the System  
User’s Guide provided by your Energy  
Utility or systems provider.  
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of this thermostat or these special programs  
and features, please contact your local Energy  
Utility.  
Special Energy Saving Features  
The EnergyPro™ Thermostat supports  
Demand Response and Price Response  
Programs from your Energy Utility. If you have  
any questions concerning the application of this  
thermostat or these special programs and  
features, please contact your local Energy  
Utility.  
System  
Set Program Set Day/Time  
Cool  
Em Ht Aux Ht  
Fan  
Sat  
Room  
Demand Response  
If your utility offers a Demand Response  
Wake  
DST  
Auto  
M20901  
Program, this thermostat can be managed by  
your utility to reduce your energy consumption  
during times of peak demand. When your  
thermostat is helping your Energy Utility to  
manage energy in your community, the word,  
SAVE, is displayed on the thermostat as shown.  
If you have any questions about the application  
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Pre-Cool and Pre-Heat  
Price Response  
Your Energy Utility may decide to use the  
Pre-cool /Pre-heat feature to slightly raise or  
lower your home temperature setting  
If your utility offers a Price Response Program,  
this thermostat works with your Energy Utility to  
inform you of the rate in effect at any given time  
and automatically adjust your energy use for  
each rate. The rate in effect is indicated on the  
thermostat display as shown (Critical, Hi, Med,  
and Lo). This typically involves controlling your  
home at a higher temperature during cooling  
season and a lower temperature during heating  
season to reduce energy consumption.  
immediately prior to a Demand Response  
event to minimize the effect on your comfort.  
When the Pre-heat or Pre-cool option is in  
effect, the thermostat displays PrE.  
System  
Set Program Set Day/Time  
Cool  
Em Ht Aux Ht  
Tue  
Wake  
Fan  
Room  
DST  
Auto  
M20902  
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System  
System  
Set Program Set Day/Time  
Med  
Set Program Set Day/Time  
Cool  
Cool  
Critical  
AM  
AM  
Em Ht Aux Ht  
Em Ht Aux Ht  
Fan  
Tue  
Wake  
Room  
Fan  
Tue  
Room  
Wake  
DST  
Auto  
DST  
Auto  
M20904  
M20906  
Display shows Critical rate in effect.  
Display shows Medium rate in effect.  
System  
System  
Hi  
Set Program Set Day/Time  
Lo Set Program Set Day/Time  
Cool  
Cool  
AM  
AM  
Em Ht Aux Ht  
Em Ht Aux Ht  
Fan  
Fan  
Tue  
Room  
Tue  
Wake  
Room  
DST  
Wake  
DST  
Auto  
Auto  
M20905  
M20903  
Display shows High rate in effect.  
Display shows Low rate in effect.  
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If the utility does not offer the My Choice  
feature, pressing and holding the Run Program  
key will not cancel the energy-saving event.  
My Choice  
There may be times when you need to cancel  
an energy-saving event such as Demand  
Response, Pre-heat or Pre-cool. Your Energy  
Utility may offer a program that incorporates the  
My Choice feature. To use My Choice and  
cancel an energy-saving event, press and hold  
Run Program key for three seconds until the  
thermostat displays Done.  
Call your Energy Utility provider for  
further information.  
Run  
Program  
OPERATING YOUR  
THERMOSTAT  
Your new thermostat saves energy and keeps  
you comfortable at the same time. You may be  
wondering how to program your thermostat and  
how to use some more time and energy-saving  
features. First, let’s look at features you’ll be  
using often, like setting the System and Fan  
keys, how to override the current programming  
mode or to hold the thermostat at a specific  
temperature while you go on vacation. You can  
M14596  
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even program the thermostat to return to your  
regular programming schedule on your last day  
of vacation so you are comfortable when you  
return and yet save energy while you are away.  
1. Press Set Current Day/Time key.  
PM  
Mon  
SETTING THE CLOCK  
M14580  
Press Set Current Day/Time key to show information  
displayed.  
Setting Current Day and Time  
Setting the clock can be controlled as part of  
the system using two-way  
RF communication; then  
the time is automatically  
updated.  
IMPORTANT  
Always press keys with your fingertip  
or similar blunt tool. Sharp instruments  
like pens and pencil points can  
damage keyboard.  
2.  
Press Day key until current  
day displays.  
On initial powerup or after an extended power  
loss, “1:00 PM” flashes on display until a key is  
pressed.  
Day  
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Mon = Monday, Tue = Tuesday,  
Tap Set Current Day/Time key to  
advance time in  
one-hour  
Wed = Wednesday,  
Thu = Thursday,  
Fri = Friday, Sat = Saturday,  
Sun = Sunday.  
increments.  
4.  
Press Run Program key to  
return to normal operation.  
Run  
Program  
PM  
AM  
M14581  
Press Day key to set current day. Example display  
shows Tuesday.  
3.  
Press Time  or  
Time key until  
M14582  
Press Time  or Time  key to set current time.  
Example display shows 8:15 AM.  
current time displays.  
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Pressing Daylight Tiime key more than once in  
a five-minute period scrolls  
you through various time  
Daylight Saving Time  
NOTE: If current time is Daylight Saving Time,  
press Daylight Time key to display  
options (example: one-hour  
earlier or later with or  
“DST.”  
Daylight  
Time  
without DST). Pressing  
Daylight Time six times in a  
five-minute period returns  
you to your original setting.  
AM  
Setting System and Fan Keys  
Use the System and Fan keys to change the  
system and fan settings. The fan settings can  
be set for each schedule period individually.  
System selection is for all schedule periods.  
M14583  
Press Daylight Time key to set Daylight Saving Time.  
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Heat: The thermostat controls the heating.  
Off: Both the heating and cooling are off.  
Cool: The thermostat controls the cooling.  
CAUTION  
Equipment Damage Hazard.  
Can cause permanent damage to the  
compressor or other equipment.  
To avoid possible compressor damage,  
allow compressor to remain off for five  
minutes before restarting.  
Auto: The thermostat automatically changes  
between heating and cooling operation,  
depending on the indoor temperature.  
To avoid possible equipment damage,  
do not operate cooling when outside  
temperature is below 50°F (10°C). See  
equipment manufacturer instructions.  
Em.Ht: Emergency heat is controlled as stage 1  
heat. The Cooling system is  
off. The compressor is de-  
energized.  
HEAT PUMP  
Setting System Key  
Press the System key until the  
desired system (Heat, Off, Cool,  
or Auto) displays.  
System  
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Setting Fan Key  
Changing Temperature to Temporary  
Setting Until Next Schedule Period  
Press Fan key until desired mode  
Fan  
(
On or Auto) displays:  
Press increase or decrease key until the  
On: Fan operates continuously.  
Auto: Fan operates only when heating  
or cooling.  
desired temperature setpoint displays.  
Temporary Setting  
Setting Temporary Temperatures  
You can override the current schedule period to  
temporarily change the temperature setting  
until the next schedule period, or you can  
change and hold the temperature setting  
indefinitely. You can also change the  
M14563  
While selecting a temporary setting, only the setpoint  
displays.  
temperature setting until a designated day and  
period (for example, while you are on vacation).  
The temporary temperature setting you select  
displays for approximately three seconds. The  
display reads “Temporary” until the next period  
begins or when you cancel the temporary  
temperature setting.  
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Press the Run Program key to  
cancel the temporary temperature  
setting before the designated time.  
If  or  appears under temperature display,  
both heating and cooling  
Run  
Program  
setpoints are being  
adjusted. Tapping  or ꢁ  
key changes both heat and  
cool setpoints one degree.  
System  
Heat  
Temporary  
(
Press i key after setpoint is  
AM  
reached to verify setpoints.)  
Fan  
Mon  
Heat  
Auto  
Changing and Holding Temperature  
M14564  
Setting Indefinitely  
After selecting a temporary setting, the display reads  
Temporary” until cancelled. Example display shows  
temporary heat setting of 70° at 6:00 AM.  
Hold Temp  
1. Press Hold Temp key once.  
2. Press  increase or decrease  key to  
change temperature setpoint, if desired.  
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NOTE: The Display changes from setpoint to  
room temperature after approximately  
three seconds.  
Changing Temperature Setting Until a  
Designated Day and Period (Vacation  
Hold)  
3.  
Press Run Program key to  
cancel hold.  
Hold Temp  
Hold Temp  
1.  
Press Hold Temp key twice.  
System  
Heat  
Setting  
System  
Heat  
Setting  
Hold for  
Fan  
Days  
Fan  
Heat  
Auto  
M14565  
Wake  
Heat  
Auto  
Press Hold Temp key once to display the thermostat  
in Hold mode. Example display shows temporary  
heat setting of 60°.  
M14833  
Press Hold Temp key twice to display thermostat in  
Vacation mode. Example display shows temporary  
heat setting of 60°.  
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IMPORTANT  
3. Press Wake, Leave, Return or Sleep key  
To cancel Vacation Hold before desig-  
to select the period the Hold ends.  
nated time, press Run Program key.  
Wake  
Leave  
Return  
Sleep  
2.  
Press Time  or Time ∇  
until desired number of  
days (1 to 255 days)  
displays.  
System  
Heat  
System  
Heat  
Setting  
Fan  
Hold for  
Auto  
Days  
Fan  
M14571  
th  
In this example, the Hold ends after the 18 day at the  
beginning of the Return period.  
Wake  
Heat  
Auto  
M14834  
Press Time  or Time  key to select number of  
vacation days. Example display shows 18 vacation  
days.  
4.  
Press  increase or decrease  to  
adjust temperature setting, if desired.  
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NOTE: Only the heating temperature is used  
when System is set to Heat. Similarly,  
only the cooling temperature is used  
when System is set to Cool. The  
thermostat uses both heating and  
cooling temperatures when System is  
set to Auto.  
5. Press Heat/Cool Settings key  
to change between heat and  
cool settings.  
Heat/Cool  
Settings  
6. Press  increase or decrease  to  
adjust temperature setting, if desired (for  
example, if cool is set to 84°, cooling  
equipment operates when room  
temperature is above 84°F).  
7.  
Press Run Program to start  
over or return display to  
normal.  
Run  
Program  
System  
Heat  
Fan  
Auto  
M14572  
Press increase or decrease key to select a new  
Hold temperature. Example display shows temporary  
heat setting of 55°.  
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If filter status is expired, refer to Filter Indicator  
Using the i (Information) Key  
section. Sequence of i key presses is:  
Filter status.  
Outdoor temperature (if equipped).  
Current setpoint of mode in use (Heat or  
Cool).  
System  
Em Hea
AM  
Fan  
Tue  
Wake  
Room  
Setpoint of mode not currently in use.  
DST  
Auto  
INFORMATION KEY  
M20896  
Displaying Outdoor Temperature  
The i (information) key provides information at  
your fingertips in this sequence of key presses:  
Outdoor temperature (if equipped).  
Current setpoint of mode in use (Heat or  
Cool).  
Outdoor  
INFORMATION KEY  
M20897  
Setpoint of mode not currently in use.  
Filter status.  
Press i key once to display outdoor temperature.  
Example display shows outdoor temperature at 50°.  
Press i key once to display outdoor temperature  
(if equipped).  
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If filter status is expired, press i key twice to  
display outdoor temper-  
ature. See Filter Indicator  
section for instructions on  
resetting filter indicator.  
Cool  
Displaying Current Settings  
M2089  
Press i key twice to check current temperature  
setpoint. Press i key three times to check  
temperature setpoint of mode not currently in  
use.  
Press i key twice to display current setpoint. Example  
display shows cooling setpoint of 75°.  
Without outdoor temperature sensor, press  
i key once to display current setpoint;  
press i key twice for opposite setpoint.  
If filter status is expired, press i key three times  
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to check current temper-  
ature setpoint, if equipped  
with outdoor sensor.  
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0
0
80 90  
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Filter Indicator  
Setting or Resetting Filter Indicator  
Your thermostat comes preset to a 30-day  
setting. To change this setting or reset after  
filter expiration:  
System  
AM  
Em Heat  
1. Press Filter key to enter Filter  
Filter  
Tue  
Wake  
Fan  
Filter  
Room  
mode.  
DST  
Auto  
FILTER EXPIRATION INDICATOR  
M20899  
Your thermostat monitors the amount of time  
the fan is running and lets you know when to  
replace the filter, based on the number of fan  
run-time days you select. On expiration,  
thermostat displays “Filter.”  
M14577  
Press Filter key to display filter information. Example  
display shows current fan run time set to 30 days with  
filter set to expire in five days.  
One fan run-time day equals 24 fan run-time  
hours. (If fan is on only one-  
third of the time each day, it  
takes three days to deduct  
2.  
Press and hold Filter key for  
at least three seconds to  
reset fan run time.  
Filter  
one fan run-time day.)  
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LED Indicators (T8665D Only)  
Setting  
HEAT PUMP FAULT  
MONITOR LED  
EQUIPMENT  
MONITOR LED  
Filter  
Days  
M17762A  
Hold down Filter key to reset counter.  
3
.
Press Time  or Time  until desired  
number of days display (0, 15, 30, 60, 90,  
or 120).  
M19467  
4.  
Press Run Program key to  
Run  
Two LED indicators located on upper right of the  
thermostat indicate when a Heat Pump Fault Monitor  
or Equipment Monitor signal is sent to the thermostat  
from the system. When Heat Pump Fault Monitor  
LED indicator lights (red), see Troubleshooting  
section.  
Program  
return to normal operation.  
IMPORTANT  
To track time fan is running, you must  
select a setting other than 0 (0 means  
off). If setting is 0 days, display always  
shows “0 Days; 0 Setting” when Filter  
key is pressed.  
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Heat Pump Fault Monitor LED lights red when  
heat pump failure is  
System  
Heat  
Temporary  
detected. Switch thermostat  
to Em. Ht. and contact you  
heat pump service com-  
AM  
Fan  
Mon  
HEAT PUMP  
Heat  
Auto  
pany. Heating with Em. Ht.  
M17763  
is expensive, so act quickly.  
Successful Communication Indicator  
PROGRAMMING YOUR  
THERMOSTAT  
The thermostat periodically sends and receives  
messages. The small triangle right of the  
temperature display indicates the thermostat  
successfully communicated with the system  
controller installed by your Energy Utility.  
7-Day Program and Operation  
Your thermostat is 7-day programmable, which  
means you can set your thermostat for four  
periods (Wake, Leave, Return and Sleep) and  
up to eight temperatures (four Heat and four  
Cool) for each day of the week. Each day can  
be the same or different.  
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Program Periods:  
and a cooler temperature during cooling  
season and it follows the energy-saving  
LEAVE period.  
WAKE—The program period when you want  
the house at a comfortable temperature  
when you get up and while you get ready for  
work or school. (This is a higher temperature  
during heating season and a cooler temper-  
ature during cooling season.)  
SLEEP—The program period you set for an  
energy-saving temperature while you are  
sleeping. This is a lower temperature during  
heating season and a higher temperature  
during cooling season and it follows the  
RETURN period.  
LEAVE—The program period you can set for  
an energy saving temperature while you are  
away at work or school. This is a lower tem-  
perature during heating season, and higher  
temperature during cooling season and it  
follows the WAKE period.  
7
-Day Preprogrammed Schedule  
Your thermostat is preprogrammed with the  
schedule shown in Table 1 (same schedule for  
all days of the week). You may keep this  
schedule or develop your own. Before starting  
the programming procedure, use Table 2 to  
plan your schedule.  
RETURN—The program period when you  
want the house at a comfortable tempera-  
ture for activities before bedtime. This is a  
higher temperature during heating season  
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Instructions:  
3. Draw a circle around the fan operation  
1.  
.
Write the time you want for each program  
period.  
you desire for each period.  
2
Write the heating and cooling tempera-  
tures you want for each period.  
Table 1. 7-Day Preprogrammed Schedule.  
LEAVE RETURN  
Day  
WAKE  
SLEEP  
All Days  
TIME  
FAN  
6:00 AM  
TIME  
FAN  
8:00AM  
TIME  
FAN  
H 70  
(21)  
6:00 PM  
TIME  
FAN  
10:00 PM  
AUTO  
C 78  
(2.5)  
AUTO  
C 85  
AUTO  
C 78  
AUTO  
C 82  
(28)  
H 70  
H 62  
(16.5)  
H 62  
(16.5)  
(
21)  
(29.5)  
(25.5)  
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Customizing Your Own 7-Day Schedule  
Table 2. Your 7-Day Schedule.  
LEAVE RETURN  
Day  
WAKE  
SLEEP  
SUN  
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
AUTO  
C
ON  
ON  
ON  
ON  
AUTO  
C
ON  
ON  
ON  
ON  
AUTO  
C
ON  
ON  
ON  
ON  
AUTO  
C
ON  
ON  
ON  
ON  
MON  
TUES  
WED  
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
AUTO  
C
AUTO  
C
AUTO  
C
AUTO  
C
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
AUTO  
C
AUTO  
C
AUTO  
C
AUTO  
C
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
AUTO  
C
AUTO  
C
AUTO  
C
AUTO  
C
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Table 2. Your 7-Day Schedule. (Continued)  
Day  
WAKE  
LEAVE  
RETURN  
SLEEP  
THURS  
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
AUTO  
C
ON  
ON  
ON  
AUTO  
C
ON  
ON  
ON  
AUTO  
C
ON  
ON  
ON  
AUTO  
C
ON  
ON  
ON  
FRI  
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
AUTO  
C
AUTO  
C
AUTO  
C
AUTO  
C
SAT  
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
TIME  
FAN  
H
AUTO  
C
AUTO  
C
AUTO  
C
AUTO  
C
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Programming the First Day  
To modify the preprogrammed schedule, start  
by programming the Wake time and temper-  
ature and fan operation for any one day.  
System  
Heat  
Set Program  
Setting  
AM  
Fan  
Wake  
Mon  
Wake  
1.  
Press the Wake key.  
Heat  
Auto  
M14588  
System  
Heat  
Press Day key to select day to program. Example  
display shows Monday is selected and ready to  
program.  
AM  
Fan  
Auto  
3.  
Press Time  or Time  key until desired  
M14586  
Wake time displays.  
Press Wake key to enter program mode. Example  
display shows 6:00 AM Tuesday with Heat set to  
70°F.  
2.  
Press Day key until desired  
day displays.  
Day  
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System  
Heat  
System  
Heat  
Set Program  
Setting  
Set Program  
Setting  
AM  
AM  
Fan  
Fan  
Mon  
Wake  
Mon  
Wake  
Auto  
Heat  
Auto  
Heat  
M14590  
M14589  
Press  increase or decrease key to select  
Press the Time  or Time  key to select time Wake  
period will begin. Example display shows Wake  
period will begin at 6:30 AM.  
temperature for Wake period. Example display  
hows heating Wake period set for 68°.  
Setpoint temperature range is 40° to 90°F  
The program times are in fifteen-minute  
intervals; for example, 8:00,  
(
4° to 32°C) for heating;  
7
0
80 90  
6
0
55° to 99°F (13° to 37°C)  
for cooling.  
8:15, 8:30.  
6
0
0
80 90  
7
4.  
Press  increase or decrease  until  
desired Wake temperature displays.  
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5
.
.
Press Fan key to modify fan  
operation. Selecting Auto  
means fan runs only when  
Fan  
System  
Heat  
Set Program  
Setting  
Cool  
AM  
heating or cooling equipment is operat-  
ing. Selecting On means fan runs contin-  
uously for entire schedule period.  
Fan  
Mon  
Wake  
Auto  
M14591  
Press Heat/Cool Settings key to select cooling  
system (if you previously set heating temperature).  
Current setting displays. Example display shows  
cooling system previously set for 78°.  
6
Press Heat/Cool Settings  
Heat/Cool  
Settings  
key to make selections for  
opposite system setting  
(either Heat or Cool).  
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7.  
Press increase or decrease key until  
IMPORTANT  
Repeat steps 1 through 7 for each day  
desired temperature setpoint displays.  
of the week that has a different  
System  
Heat  
schedule from the first day. Or refer to  
Copying a Day section to copy any  
programmed day to another day.  
Set Program  
Setting  
AM  
Fan  
Mon  
Wake  
Cool  
Auto  
9. Press Run Program key to return to  
M14592  
normal operation.  
Run  
Press  increase or decrease to select cooling  
Wake temperature. Example display shows cooling  
Wake period set for 76°.  
Program  
Copying a Day  
8.  
Press Leave, Return or Sleep and repeat  
steps 3 through 6 to program entire day.  
The day (first day of a 7-day schedule) is  
now programmed.  
The thermostat must be in program mode to  
use the copy feature. Go to  
step 2 if the thermostat is  
already in program mode  
(set program displays in  
upper left corner).  
Leave  
Return  
Sleep  
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1
.
.
Press Wake, Leave, Return or Sleep key  
to enter program mode.  
3. Press Copy key.  
Copy  
Wake  
Leave  
Return  
Sleep  
2
Press Day key to select the  
day to copy from.  
Day  
Mon  
System  
Set Program  
Setting  
Heat  
AM  
M14594  
Press Copy key to copy a day schedule into memory.  
Example display shows Monday schedule was coped  
into memory.  
Fan  
Mon  
Wake  
Heat  
Auto  
M14590  
4. Press Day key until day to be  
Day  
copied to is displayed.  
Press Day key to select the day schedule to copy.  
Example display shows thermostat in program  
mode with Monday ready to be copied.  
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Mon  
Wed  
M14596  
Press Copy key again to complete copy command.  
Example display shows “donE”. Monday schedule  
was successfully copied to Wednesday (Monday and  
Wednesday now have the same schedule).  
M14595  
Press Day key again to select the day to copy to.  
Example display shows Monday and Wednesday.  
Because Monday was already selected, Monday  
schedule will be copied to Wednesday.  
NOTE: “donE” displays for two seconds  
before the normal display returns.  
5.  
Press Copy key.  
Copy  
6
.
.
Repeat steps, as necessary, for all peri-  
ods and days desired.  
7
Press Run Program key to  
return to normal operation.  
Run  
Program  
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Clearing a Program Period  
System  
Heat  
Set Program  
Setting  
Thermostat must be in program mode to use  
clear feature. Go to step 2 if  
thermostat is already in  
program mode (Set  
AM  
Fan  
Mon  
On  
Leave  
Heat  
Program displays in upper  
left corner.  
M14597  
Press Leave, Return, or Sleep to enter the  
program mode. Example display shows 8:00 AM on  
Monday in Leave period with Heat set for 62°.  
1.  
Press Leave, Return or Sleep key to  
enter program mode.  
2. Press Day key until desired  
Day  
day displays.  
Leave  
Return  
Sleep  
System  
Heat  
Set Program  
Setting  
AM  
Fan  
Sat  
On  
Leave  
Heat  
M14598  
Press Day key to select the day to begin clearing the  
periods. Example display shows Saturday is selected.  
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3.  
Press and hold Leave, Return or Sleep  
key until start time and temperature set-  
ting clear (approximately three seconds).  
You do not have to program a replacement time  
for the remaining periods;  
for example, Wake and  
Sleep. If you clear only  
Leave  
Return  
Sleep  
Leave and Return periods  
for Saturday (or any day),  
thermostat remains in Wake  
period for all of Saturday  
until Sleep period.  
Set Program  
Setting  
4
.
Repeat steps, as necessary, for all  
periods to be cleared.  
Sat  
5. Press Run Program key to  
Run  
Leave  
Heat  
Program  
M14599  
return to normal operation.  
Press and hold Leave, Return or Sleep key to clear  
the period for that day. Example display shows  
Saturday Leave period cleared.  
NOTE: Wake cannot be cleared.  
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REPLACING THE BATTERIES  
T8665C ONLY)  
WALLPLATE  
(
B
IMPORTANT  
Three AA alkaline batteries are  
included with the thermostat. Batteries  
must be installed for programming and  
operation of the thermostat and the  
heating/cooling system.  
R
RC  
O
W
Y
G
Day  
1
.
.
Install batteries in wallplate so positive  
terminals all point up (as shown).  
If the thermostat is already mounted on  
the wall, remove the thermostat by  
placing your thumb between the  
thermostat and wallplate and pulling the  
thermostat up and away as shown on the  
next page.  
INSTALL 3 AA ALKALINE BATTERIES  
AS SHOWN, POSITIVE (+) TERMINALS  
TOWARD TOP.  
2
M10622  
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MPORTANT  
Although thermostat has a low battery  
indicator, replace batteries yearly to  
prevent leakage and thermostat and  
heating/cooling system from shutting  
down due to lack of thermostat battery  
power.  
4.  
If you insert new batteries within 20 to 30  
seconds of removing old batteries, the  
system retains current time and day. If the  
display is blank, batteries are dead or  
installed incorrectly. You must reset time  
and day. See Setting the Clock section.  
M16424  
3.  
When batteries are running low, a REPL  
BAT message flashes for one to two  
months before batteries run out com-  
pletely. Replace batteries as soon as pos-  
sible after message flashes.  
As a precaution, when leaving home for longer  
than a month, change  
70 80 90  
0
6
batteries before leaving to  
prevent system shutting  
down due to lack of power.  
6
0
0
80 90  
7
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Always use fresh alkaline batteries. Non-  
alkaline batteries do not last as long and can  
leak, causing damage to the thermostat and  
wall surface.  
reads both the temperature of the wall and in  
the air, and responds to temperature changes  
as little as one degree Fahrenheit, so room  
temperature is more likely to feel right to you  
and your family.  
The thermostat acts like a computer. When  
calculating the time to turn on your heating or  
cooling system, it considers air temperature,  
wall temperature, and the time you want to  
reach the comfort temperature. After  
ADAPTIVE INTELLIGENT  
RECOVERY™ CONTROL  
Your new thermostat is so smart, it’s almost  
human. You perceive temperature from a  
variety of sources, not only from the air in the  
room, but also from your surrounding walls,  
windows and furnishings. Humans feel  
considering these three things, Adaptive  
Intelligent Recovery™ control gradually  
changes the temperature from the energy  
savings setting to the comfort setting (for  
example, from a heating temperature of 62° at  
night to 70° in the morning).  
differences in temperature as slight as two  
degrees Fahrenheit. Common household  
thermometers and standard thermostats sense  
only air temperature, which may not reflect how  
hot or cold the room actually new thermostat  
The system runs continuously until the comfort  
temperature you choose is reached without  
overshooting the setting. This saves energy.  
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How do you know when the system is in  
recovery? The thermostat displays “Recovery”  
whenever the thermostat activates Adaptive  
Intelligent Recovery™ control. (See display.)  
adjusts the next day’s recovery start time  
accordingly. After four to eight days, the  
thermostat has adjusted to local weather, your  
lifestyle, the construction of your home, and  
your heating and cooling system.  
Recovery” displays during recovery time from  
Sleep to Wake and from Leave to Return.  
Optimum Comfort and Energy  
Savings  
System  
Set Program Set Day/Time  
AM  
In Fig. 3, Adaptive Intelligent Recovery™  
control starts to recover at 5:00 AM and  
reaches the comfort temperature of 68° at  
6:30 AM. Recovery time varies with the starting  
temperature and the comfort temperature you  
choose.  
Heat  
Em Ht Aux Ht  
Fan  
Mon  
Wake  
Room  
Recovery  
Auto  
M20895  
After installation or new schedule programming,  
your thermostat learns from experience. Each  
day it checks how closely it hit the recovery  
target (for example, 70° at 6:00 AM) and  
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At 7:00 AM System  
Operating in Comfort Mode  
System  
Heat  
AM  
At 6:00 AM  
Recovery  
Continues  
Fan  
M
Wake  
on  
Room  
Auto  
System  
Heat  
AM  
Fan  
At 5:00 AM  
Recovery  
Continues  
Mon  
Room  
Auto  
Sleep Recovery  
System  
Heat  
1
AM  
Fan  
Mon  
Room  
At 4:00 AM  
Recovery Begins  
Sleep Recovery  
Auto  
System  
Heat  
AM  
Fan  
Mon  
Room  
Sleep Recovery  
Auto  
ENERGY  
SAVINGS  
PERIOD  
COMFORT  
PERIOD  
RECOVERY FROM ENERGY SAVINGS  
TIME  
THE THERMOSTAT USES THE SAME SCHEME TO RETURN GRADUALLY TO LOWER COMFORT TEMPERATURE DURING THE COOLING SEASON.  
M19473  
1
IF In Recovery IS DISPLAYED, PRESS  
TO SEE THE COMFORT SETPOINT.  
Fig. 3. Explanation of Adaptive Intelligent Recovery™ control.  
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TROUBLESHOOTING (TABLE 3)  
Table 3. Troubleshooting.  
Possible Cause  
Symptom  
Action  
Display does not  
come on.  
Thermostat is not being  
powered.  
Check if the thermostat is mounted and  
latched on the wallplate—mount and latch  
the thermostat on the wallplate.  
Check if the circuit breaker is tripped—  
reset the circuit breaker.  
Check if the fuse at the fuse box is  
blown—replace the fuse.  
Check if System switch at equipment is in  
the Off position—set to On position.  
Check if batteries are correctly installed—  
be sure they are fresh and installed  
correctly. Replace them, if necessary.  
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Table 3. Troubleshooting. (Continued)  
Possible Cause  
Symptom  
Action  
Temperature  
The upper or lower  
temperature limits were  
reached.  
Check that the temperature setpoints are  
Heating: 40 to 90° (4.5 to 32 °C).  
Cooling: 45 to 99° (7 to 37 °C).  
setting does not  
change (Example:  
cannot set the  
heating higher or  
the cooling lower).  
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Table 3. Troubleshooting. (Continued)  
Possible Cause  
Symptom  
Action  
Heating does not  
come on.  
The thermostat is part of a  
Demand Response event.  
If thermostat indicates SAVE, wait until  
energy saving event is complete. To  
cancel energy saving event, if available,  
press and hold Run Program.  
Check that setpoint is above room  
temperature.  
No power to thermostat.  
System selection is not set  
to Heat.  
Check if circuit breaker is tripped—reset  
circuit breaker.  
Heating setpoint is below  
room temperature.  
Check if fuse at fuse box is blown—  
replace fuse.  
Check if System switch at equipment is in  
Off position—set to On position.  
Wait five minutes for System to respond  
(
thermostat displays “Wait”).  
Set System selection to Heat.  
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Table 3. Troubleshooting. (Continued)  
Possible Cause  
Symptom  
Action  
Cooling does not  
come on  
The thermostat is part of a  
Demand Response event.  
If thermostat indicates SAVE, wait until  
energy saving event is complete. To  
cancel energy saving event, if available,  
press and hold Run Program.  
Check that setpoint is below room  
temperature.  
No power to thermostat.  
System selection is not set  
to Cool.  
Check if circuit breaker is tripped—reset  
circuit breaker.  
Cooling setpoint is above  
room temperature.  
Check if fuse at fuse box is blown—  
replace fuse.  
Check if System switch at equipment is in  
Off position—set to On position.  
Wait five minutes for System to respond—  
(
thermostat displays “Wait”).  
Set System selection to Cool.  
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Table 3. Troubleshooting. (Continued)  
Possible Cause  
Symptom  
System on  
Action  
Heating/cooling equipment  
turns on the fan when the  
equipment has reached the  
preset time or temperature.  
Wait a minute after seeing the  
indicator—  
or  
and then check the registers.  
for heat;  
for cool—  
is lit, but no warm  
or cool air is  
coming from the  
registers.  
Heat Pump Fault  
Monitor LED is  
lighted.  
The heat pump signaled the  
thermostat to indicate a  
problem.  
Move the System switch to Em. Ht setting  
(heat pump only). See Heat pump  
Operating Instructions or call your local  
heat pump dealer or Energy Utility for  
assistance.  
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Table 3. Troubleshooting. (Continued)  
Possible Cause  
Symptom  
Action  
Room temperature  
is cooler than  
Thermostat is operating in  
Pre-cool mode. If the  
thermostat displays PrE,  
wait until the Pre-cool event  
is complete.  
If PrE does not display, contact your local  
heating contractor or Energy Utility.  
current setting and  
air conditioner is  
still running.  
To cancel, press and hold  
Run Program for three  
seconds until DONE is  
displayed.  
Outdoor  
Installer did not activate this  
option.  
Contact installer or service technician.  
temperature is not  
displayed or is  
incorrect.  
Outdoor sensor is connected  
incorrectly.  
Press i key twice for outdoor temperature  
when filter expiration shows on display.  
Refer to the Filter Indicator section.  
Filter expired.  
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Table 3. Troubleshooting. (Continued)  
Possible Cause  
Symptom  
Action  
1
COM is displayed. The thermostat is unable to  
communicate with Energy  
Utility management system  
controller.  
Contact your energy utility for assistance.  
Heat or cool turns  
on before  
Adaptive Intelligent  
Adaptive Intelligent Recovery™ control  
brings the heat or cool on early to meet the  
temperature set for the programmed  
period. See Adaptive Intelligent  
Recovery™ control is on.  
programmed time.  
Recovery™ control section. To disable  
Adaptive Intelligent Recovery™ control,  
contact you local Heating and Air  
Conditioning contractor.  
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Honeywell Return Goods  
Dock 4 MN10-3860  
WARRANTY  
1
885 Douglas Drive North  
Honeywell warrants this product, excluding battery, to be free  
from defects in the workmanship or materials, under normal  
use and service, for a period of one (1) year from the date of  
purchase by the consumer. If, at any time during the warranty  
period, the product is defective or malfunctions, Honeywell  
shall repair or replace it (at Honeywell’s option) within a  
reasonable period of time.  
Golden Valley, MN 55422  
This warranty does not cover removal or reinstallation  
costs. This warranty shall not apply if it is shown by  
Honeywell that the defect or malfunction was caused  
by damage which occurred while the product was in  
the possession of a consumer.  
Honeywell’s sole responsibility shall be to repair or replace  
the product within the terms stated above. HONEYWELL  
SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF  
ANY KIND, INCLUDING ANY INCIDENTAL OR  
CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR  
INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY,  
EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF  
THIS PRODUCT. Some states do not allow the exclusion or  
limitation of incidental or consequential damages, so this  
limitation may not apply to you.  
If the product is defective:  
(
i) return it, with a bill of sale or other dated proof of  
purchase, to the retailer where you purchased it, or  
(
ii) package it carefully, along with proof of purchase  
including date of purchase) and a short description of  
(
the malfunction, and mail it, postage prepaid, to the  
following address:  
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THIS WARRANTY IS THE ONLY EXPRESS WARRANTY  
HONEYWELL MAKES ON THIS PRODUCT. THE  
CUSTOMER ASSISTANCE  
DURATION OF ANY IMPLIED WARRANTIES, INCLUDING  
THE WARRANTIES OF MERCHANTABILITY AND FITNESS  
FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO  
THE ONE YEAR DURATION OF THIS WARRANTY. Some  
states do not allow limitations on how long an implied  
warranty lasts, so the above limitation may not apply to you.  
After reading this guide, if you have any  
questions about the operation of your  
thermostat, please visit the Honeywell website  
at www.honeywell.com/yourhome. For service,  
contact your Installer or Energy Utility company  
or service provider.  
This warranty gives you specific legal rights, and you may  
have other rights which vary from state to state.  
If you have any questions concerning this warranty, please  
write our Honeywell Customer Relations, 1985 Douglas Drive  
North, Golden Valley, MN 55422. In Canada, write Retail  
Products ON15-02H, Honeywell Limited/Honeywell Limitée,  
3
5 Dynamic Drive, Scarborough, Ontario M1V 4Z9.  
5
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Automation and Control Solutions  
Honeywell International Inc.  
985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
1
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
Printed in U.S.A. on recycled  
paper containing at least 10%  
post-consumer paper fibers.  
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9-1538 G.H. 04-03  
www.honeywell.com/yourhome  

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