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Electronic  
Programmable Thermostat  
Owner’s Manual  
J.S. • Rev. 5-96  
69-0862-2  
Table of Contents  
Programming Your Thermostat .................................................................................................. 3  
Program Schedule...................................................................................................................... 5  
Set Current Time/Day ................................................................................................................ 6  
Heating Program ........................................................................................................................ 6  
Cooling Program ........................................................................................................................ 7  
Operating Your Thermostat ......................................................................................................... 7  
Using Programming Features .................................................................................................... 7  
Setting Fan Switch ..................................................................................................................... 9  
Setting System Switch ............................................................................................................... 9  
Maintaining Your Thermostat .................................................................................................... 10  
Installing Batteries .................................................................................................................... 10  
Troubleshooting Guide .............................................................................................................. 12  
Limited One-Year Warranty ............................................................................. Inside Back Cover  
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Programming Your Thermostat  
When batteries are installed, your thermostat  
can be programmed in your hand before it is  
installed or after it is mounted on the wall. For  
instructions on installing or replacing the  
batteries, refer to the Maintaining Your Thermo-  
stat section.  
Refer to the personal Program Schedule on  
page 3 to program your time and temperature  
settings for various times of the day.  
Four time periods are available during  
weekdays — WAKE, LEAVE, RETURN, and  
SLEEP. During weekends, only the WAKE and  
SLEEP time periods are available. View these  
periods individually on the display when you  
press the Set Schedule key.  
WAKE is the time the thermostat turns on  
the heating/cooling equipment after an  
energy saving period. When deciding  
what time to set for your WAKE period,  
include extra lead time, depending on  
the outside temperature and your  
furnace response time, to give the  
furnace a head start to heat the house  
before you get up. (This will be a higher  
temperature during heating season, and  
a lower temperature during cooling  
season.)  
LEAVE is the time period you can set for  
an energy-saving temperature while you  
are away at work or school. (This will be  
a lower temperature during heating  
season, and a higher temperature  
during cooling season.)  
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Fill in the times and temperatures you desire  
for weekdays and weekends. If you decide not  
to program the thermostat, it automatically  
controls heating at 68°F (20°C), and cooling at  
RETURN is the time the thermostat turns  
on the heating/cooling equipment after  
an energy saving period. When deciding  
what time to set for your RETURN  
period, include extra lead time, depend-  
ing on the outside temperature and your  
furnace response time, to give the  
furnace a head start to heat the house  
before you arrive home.  
SLEEP is the time period you can set for  
an energy-saving temperature while you  
are sleeping. (For more comfortable  
sleeping, some people choose not to  
raise the cool temperature during the  
night.)  
78°F (26°C), 24 hours a day. Also, you do not  
need to enter a time and temperature program  
for all periods if your schedule does not require  
it. For example, a house that is occupied during  
weekdays would only require programs for  
WAKE and SLEEP.  
When pressing the keys, use the ball of your  
finger or a soft pencil eraser.  
NOTE: Use of sharp fingernails or pencil  
points can damage the keypad.  
You will set one schedule for weekdays and  
another for weekends because your require-  
ments will probably be different for each.  
If you make an error at any time during  
programming, just press the Run Program key,  
and continue again at the last step.  
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Program Schedule  
HEATING PROGRAM SCHEDULE  
Heating Temperature  
Weekdays  
Start Time  
2
Cooling Temperature  
2
WAKE  
LEAVE  
RETURN  
SLEEP  
__________  
__________  
__________  
__________  
____________________  
____________________  
____________________  
____________________  
____________________  
____________________  
____________________  
____________________  
1
1
Weekends  
WAKE  
1
__________  
__________  
____________________  
____________________  
____________________  
____________________  
SLEEP  
1
2
WAKE and RETURN start times should include extra lead time, based on outside temperature  
and furnace response time, to give your furnace a head start to heat the house.  
The temperatures cannot be set higher than 88°F (31°C) or lower than 45°F (7°C).  
NOTE: If you decide not to program the thermostat, it will automatically control heating at 68°F  
20°C), and cooling at 78°F (26°C), 24 hours a day. This guide can be used for program-  
ming your new thermostat.  
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IMPORTANT  
Batteries are required for operation and  
Use Time keys to program WAKE time and  
Temp keys to program WAKE temperature for  
Mon-Fri. Repeat sequence for LEAVE, RE-  
TURN, and SLEEP.  
programming. When inserting batteries,  
set the system switch to OFF. Remove  
the battery door (on the thermostat left  
side) using a coin at the bottom. See  
Maintaining Your Thermostat section.  
USE TO SET  
WARMER TEMPERATURE  
LCD DISPLAY  
USE TO SET  
TIME EARLIER  
RUN  
PROGRAM  
KEY  
SET CURRENT TIME/DAY  
AM  
To set the time, press and release the Set  
Clock/Day key once. Press the Time keys until  
the current time shows.  
TU  
LEAVE  
To set the day, press and release the Set  
Clock/Day key again. Press the Time keys until  
the current day shows. Press the Run Program  
key.  
HOLD  
TEMP  
KEY  
Fan Auto On  
System Cool Off Heat  
USE TO  
SET CURRENT  
DAY AND TIME  
USE TO  
SET COOLER  
TEMPERATURE  
USE TO SET  
TIME LATER  
HEATING PROGRAM  
USE TO SET  
PROGRAM PERIOD  
With the system switch at HEAT, press and  
release the Set Schedule key once. WAKE,  
Mon-Fri, and SET appear on the display.  
M8473  
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Press Set Schedule key until WAKE, SA SU  
and SET appear on the display. Use Time keys  
to program WAKE time and Temp keys to  
program WAKE temperature for Sat-Sun.  
Repeat the sequence for SLEEP.  
COOLING PROGRAM  
With system switch at COOL, follow the  
same instructions as for the Heating Program.  
After programming, adjust the fan and  
system switches, as desired. Press and release  
Run Program key to start the program.  
Operating Your Thermostat  
USING PROGRAMMING FEATURES  
Temporarily Change temperature for  
current period only—  
Hold a temperature indefinitely—  
Press Hold Temp key once. Press Temp  
keys until display shows desired temperature.  
Press Temp keys to set desired temperature. Press Run Program key once to return to the  
The change cancels itself at the next scheduled  
program change; to cancel sooner, press the  
Run Program key.  
program.  
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Check CurrentTemperature Setting—Press  
Cancel a program—Press Set Schedule  
Run Program key once. If using TEMPORARY key until the program to cancel shows. Pressing  
CHANGE or HOLD features, pressing this key the two Time keys together cancels the  
cancels your change.  
program.  
Check Programs—Press Set Schedule key  
repeatedly to see each time and temperature.  
Press Run Program key once to return to the  
program.  
Permanently Change a program—Repeat  
the steps in the Heating Program or Cooling  
Program sections, as applicable.  
Return to the normal program or the starting  
program—Press Run Program key once.  
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SETTING FAN SWITCH  
HEAT: The thermostat controls the heating  
system.  
Fan switching positions are:  
FAN AUTO: Normal setting for most  
homes. A single-speed fan turns on  
automatically with the air conditioner or  
furnace. A two-speed fan usually runs  
on high with the air conditioner and runs  
on low with the furnace.  
AM  
TU  
LEAVE  
FAN ON: The fan runs continuously. Use  
for improved air circulation during  
special occasions or for more efficient  
electronic air cleaning.  
Fan Auto On  
System Cool Off Heat  
SETTING SYSTEM SWITCH  
System switching positions control thermo-  
stat operation as follows:  
FAN SWITCH  
SYSTEM  
SWITCH  
COOL: The thermostat controls the air  
conditioning system.  
M5783  
OFF: Both the heating and air conditioning  
systems are off.  
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As the batteries are running low, the bAt Lo  
indicator flashes for one to two months before  
the batteries run out completely. Replace the  
batteries as soon as possible after the indicator  
starts flashing.  
Maintaining Your Thermostat  
INSTALLING BATTERIES  
IMPORTANT  
Batteries must be installed for programming  
and operation of the thermostat and heat-  
ing/cooling system.  
1. Purchase two AA alkaline batteries;  
nonalkaline batteries do not last as long, and  
can leak, causing damage to the thermostat or  
wall surface. We recommend Energizer®  
batteries.  
2
Make sure the thermostat is set in the  
OFF position.  
M5781  
3
4
. Use a coin to remove the battery door.  
. Install the fresh batteries, making sure the  
positive and negative terminals are oriented  
correctly.  
5. Replace the battery door.  
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If the batteries are not replaced sometime  
during the flashing bAt Lo, the indicator  
eventually stops flashing. bAt Lo stays on  
without flashing, indicating the thermostat and  
heating/cooling system stopped working and  
the batteries are almost completely dead.  
After the batteries are completely dead, the  
bAt Lo indicator disappears, leaving a com-  
pletely blank display.  
INSTALL TWO AA ALKALINE  
BATTERIES AS SHOWN  
AM  
TU  
LEAVE  
To remove, press down on left ends of  
batteries. If the new batteries are installed  
within 20 to 30 seconds of removing the old  
ones, the thermostat does not have to be  
reprogrammed. If the display is blank, the  
batteries are dead or incorrectly installed, the  
thermostat has to be reprogrammed. See  
Programming Your Thermostat section for  
instructions.  
Fan Auto On  
System Cool Off Heat  
FAN SWITCH  
SYSTEM  
SWITCH  
M5782  
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Troubleshooting Guide  
IF…  
THEN…  
Display will not come on.  
 Set the system switch to OFF. Remove batteries. Insert  
backward for at least five seconds to reset thermostat.  
Correctly replace batteries. Display should come on.  
Make sure batteries are fresh and installed correctly.  
Gently clean battery contacts using a soft pencil eraser.  
Do not use anything abrasive on the clips.  
Temperature display will not go  
lower than 45°F (7°C) or higher  
than 88°F (31°C) during  
programming.  
 The temperature setting limit is reached. The setting  
range is 45°F to 88°F (7°C to 31°C).  
Temperature change occurs at  
the wrong times.  
 Check program times for the period in question. Be sure  
that AM and PM indications are correct. Make sure the  
current day and time are correct. Reprogram if neces-  
sary.  
Heating will not come on.  
 Check that switch on thermostat is set to HEAT. Allow a  
minimum of five minutes for time-guard protection to  
expire.  
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Heating will not come on.  
Continued)  
 Check the system fuse or circuit breaker and replace or  
(
reset, if necessary.  
If display is blank or displays bAt Lo, install fresh  
batteries.  
If temperature setting is higher than current temperature,  
and SYSTEM ON indicator is lit, contact your local  
dealer.  
Cooling will not come on.  
 Check that switch on thermostat is set to COOL. Allow a  
minimum of five minutes for time-guard protection to  
expire.  
Check the system fuse or circuit breaker and replace or  
reset, if necessary.  
If display is blank or displays bAt Lo, install fresh  
batteries.  
The thermostat has a built-in time delay on cooling. Allow  
at least five minutes after changing the setting before the  
air conditioner starts.  
Make sure outdoor disconnect is engaged (on).  
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Cooling will not come on.  
Continued)  
 If temperature setting is lower than current temperature,  
and SYSTEM ON indicator is lit, move system switch  
from COOL to OFF for ten minutes. After ten minutes,  
return switch to the COOL position. If the air conditioner  
comes on, the compressor could have reached its high-  
limit temperature protection and shut down. If air  
(
conditioner does not come on after ten minutes and the  
SYSTEM ON indicator is lit, contact your local dealer.  
If 2- or 4-wire installation, verify that R-Rc jumper is  
installed.  
Too warm or too cool.  
 Press Run Program key to check the current tempera-  
ture setting.  
If desired, change the temperature setting. See Program-  
ming Your Thermostat section.  
SYSTEM ON indicator is lit, but  
no heat is coming from the  
registers.  
 Allow time for the furnace to heat up and the fan to come  
on before checking for heat at the register.  
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Thermostat current  
 Check that the wiring hole in the wall behind the  
wallplate was plugged with insulation to prevent  
drafts that might adversely affect thermostat operation.  
 Be aware that it is normal for the current setting and  
display temperature to differ on occasion.  
temperature setting does not  
match the display temperature  
to within ± 1°.  
During recovery from setback or setup, setting and  
display temperatures can differ for up to 30 minutes after  
the recovery period.  
Incorrect temperature  
showing on thermostat display.  
 The thermostat is factory-calibrated and cannot be  
adjusted.  
bAt Lo remains on display after  
fresh batteries are installed.  
 Remove the batteries. Wait one hour. Install fresh  
alkaline batteries.  
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NOTICE  
This equipment is a Class B digital apparatus, which complies with Canadian Radio Interference  
Regulations, CRC c.1374.  
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Limited One-Year Warranty  
Honeywell warrants this product 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 detective or malfunctions, Honeywell shall  
repair or replace it (at Honeywell’s option) within a reasonable period of time.  
If the product is detective,  
(I) return it, with a bill of sale or other dated proof-of-purchase, to the dealer or contractor from which 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:  
Honeywell Inc.  
Return Goods Department  
1050 Berkshire Lane  
Plymouth, MN 55441-4437  
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.  
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE 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.  
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.  
If you have questions concerning this warranty, please write our Customer Assistance Center, Honeywell Inc., P.O. Box 524, Minneapolis, MN  
55440-0524 or call 1-800-468-1502, Monday - Friday, 7:00 a.m. to 5:30 p.m., Central time.  
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