Honeywell 3355 Thermostat User Manual

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®
MagicStat /3355  
Programmable Thermostat by Honeywell  
OWNER’S GUIDE  
Weekday/Weekend (5-day/ 2-day)  
Programmable Heat and/or Cool  
Low Voltage (20 to 30 Vac)  
Thermostat and Mounting Plate  
Model CT3355  
6 9 -1 0 1 2
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Welcome to the world of comfort and energy  
savings with your new Honeywell MagicStat®  
Programmable Thermostat.  
RECYCLING THERMOSTAT  
If this thermostat is replacing a thermo-  
stat that contains mercury in a sealed  
tube, see Fig. 1, do not place your old  
thermostat in the trash. Contact your  
local waste management authority for  
instructions regarding recycling and the  
proper disposal of your old thermostat.  
Your new thermostat will automatically control  
the temperature in your home, keeping you  
comfortable while saving energy when pro-  
grammed according to the instructions in  
this manual.  
Direct any questions concerning the application  
of this thermostat to Honeywell Customer  
Assistance at 1-800-468-1502, Monday-Friday  
If you have questions, call Honeywell Inc.  
at 1-800-468-1502.  
7:00 a.m.-5:30 p.m., Central time.  
MERCURY�  
SWITCH  
Fig. 1. Typical  
location of a  
mercury switch in a  
thermostat.  
M3701  
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Table of Contents  
Step 1: Prepare For Installation ..................................................................................................... 4  
Step 2: Remove Old Thermostat ................................................................................................... 6  
Step 3: Install Batteries .................................................................................................................. 8  
Step 4: Program Thermostat........................................................................................................ 10  
Personal Programming Chart ...................................................................................................... 12  
Step 5: Adjust Fan Operation Switch, as Required ................................................................... 18  
Step 6: Adjust System On-Time, °F/C°, as Required ................................................................. 18  
Step 7: Mount Thermostat Mounting Plate ................................................................................. 21  
Step 8: Wire Thermostat Terminals ............................................................................................. 23  
Step 9: Mount Thermostat............................................................................................................ 27  
Step 10: Check Thermostat Operation After Programming and Installing .............................. 28  
Step 11: Set Fan and System Switches ..................................................................................... 30  
Troubleshooting Guide................................................................................................................. 32  
Limited One-Year Warranty ................................................................................. Inside Back Cover  
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Step 1: Prepare for Installation  
Check Table 1 to make sure this thermostat is compatible with your system. If not, return to the  
retailer. For more information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.  
Table 1. Compatibility Chart.  
System Type  
Compatible With CT3355  
Gas—Standing Pilot  
Gas—Electronic Ignition  
Gas-Fired Boilers  
Yes  
Yes  
Yes  
a, b  
Gas—Millivolt  
Oil-Fired Boilers  
No  
Yes  
a, b  
Oil-Fired Furnace  
Electric Furnace  
Electric Air Conditioning  
Baseboard Electric (120/240 Line Volt)  
Heat Pumps/Multistage Equipment  
Yes  
Yes  
Yes  
No  
No  
Not compatible with any 120/240 volt circuit.  
a
Compatible with 2-wire Honeywell Zone Valves. Isolating relay required for 3-wire thermostats for  
zone valves. Not compatible with 2-wire White-Rodgers no. 1361 Valves.  
Compatible with hot water baseboard systems. Will not work efficiently on steam or gravity  
systems.  
b
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Acquire tools and items below as needed. Also purchase two AA alkaline batteries; we recom-  
mend Energizer® batteries.  
CROSS-RECESSED�  
SCREWDRIVER  
HAND OR POWER�  
DRILL WITH 3/16 INCH�  
DRILL BIT, IF NEEDED TO�  
DRILL HOLES IN WALL  
MASKING TAPE, IF �  
WIRE CUTTER/STRIPPER OR SHARP�  
KNIFE, IF NEEDED TO STRIP WIRES  
NEEDED TO LABEL WIRES �  
AS DISCONNECTED FROM�  
OLD THERMOSTAT  
LEVEL, IF NEEDED TO LEVEL�  
THERMOSTAT FOR APPEARANCE  
M878B  
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Step 2: Remove Old Thermostat  
Test to make certain that your heating and  
cooling systems are working properly. If  
either does not work, contact your local  
heating/air conditioning dealer. To avoid  
compressor damage, do not operate the  
cooling system when outdoor temperature is  
below 50°F (10°C).  
 Disconnect wires from the old thermostat or  
subbase. As you disconnect each wire, use  
masking tape to label it with the old terminal  
designation. If there are only two wires, they  
do not need to be labeled. If there is an extra  
wire that is not connected to your old  
thermostat, you will also not be connecting it  
to your new thermostat. Wrap wires as shown  
to keep them from falling back into the wall.  
TURN OFF POWER to system at the  
furnace, or at the fuse/circuit breaker panel.  
Carefully unpack your new thermostat and  
mounting plate; save package of screws,  
instructions and receipt.  
WIRES THROUGH�  
WALL OPENING  
Remove the cover from the old thermostat.  
If it does not snap off when pulled firmly  
from the bottom, check for a screw used to  
lock on the cover.  
Loosen screws holding thermostat to  
subbase, wallplate or wall, and lift away.  
M5136  
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Replacing a Clock Thermostat  
that has C or C1 Clock Terminals?  
If you are replacing a Honeywell Chronotherm®  
Thermostat, you can find one or two wires that  
go to the C or C1 clock terminals on the  
Chronotherm® Thermostat wiring wallplate. Do  
not allow them to touch, or you may damage  
your transformer. Disconnect the wires and wrap  
them separately, using electrical tape. Do not  
wrap them together. Place the wires where they  
do not interfere with the operation of the new  
thermostat. Record the colors and terminal  
designation labels of the remaining wires.  
such systems so return the product to the  
place of purchase. If you would like information  
about which programmable thermostats work  
with your system, call Honeywell Customer  
Assistance at 1-800-468-1502.  
Three thermostat wires?  
If you have three wires for heating only and  
can operate the fan using the fan ON switch,  
this thermostat works with your system.  
However, some hot water (zoned) heating  
systems have three thermostat wires. The  
thermostat does not work without installing an  
isolating relay on these systems. For details,  
call Honeywell Customer Assistance at  
1-800-468-1502.  
Six or more wires?  
If there are six or more wires (excluding clock  
wires attached to terminals), you probably have  
a variation of a heat pump or multistage  
system. The thermostat is not compatible with  
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Step 3: Install Batteries  
IMPORTANT  
Batteries must be installed for  
programming and operation of the  
thermostat and heating/cooling  
system.  
Purchase two AA alkaline batteries; non-  
alkaline batteries do not last as long, and  
can leak, causing damage to the thermostat  
or the wall surface. We recommend  
Energizer® batteries.  
Make sure the thermostat is set to the OFF  
position.  
REMOVING �  
BATTERY�  
DOOR  
M1719C  
As the batteries are running low, a bAt Lo  
indicator flashes for one or two months before  
batteries run out completely. Replace the  
batteries as soon as possible after the indicator  
starts flashing. If you do not replace the  
Use a coin to remove the battery door.  
Install the fresh batteries as shown, making  
sure positive and negative terminals are  
oriented correctly.  
Replace the battery door.  
batteries sometime while bAt Lo is flashing, the  
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indicator eventually stops flashing. bAt Lo  
stays on without flashing, indicating the  
thermostat and heating/cooling system  
have stopped working when the batteries  
are almost completely dead.  
Press down on the left ends of the batteries to  
remove. If you insert the new batteries within  
20 to 30 seconds of removing the old ones,  
you do not have to reprogram the thermostat.  
However, if the display is blank, the batteries  
are dead or incorrectly installed and you must  
reprogram. See pages 14 and 15 to reprogram.  
After the batteries are completely dead, the  
bAt Lo indicator disappears, leaving a com-  
pletely blank display.  
IMPORTANT  
Although the thermostat has a low  
battery indicator, replace the batteries  
once a year to prevent the thermostat  
and heating/cooling system from  
shutting down due to lack of  
battery power.  
INSTALL TWO AA ALKALINE �  
BATTERIES AS SHOWN  
As a precaution, when leaving home for longer  
than a month, change batteries before you  
leave to prevent the system from shutting down  
due to lack of battery power.  
M1713  
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while you get ready for work or school. 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, or a lower  
temperature during cooling season.)  
Step 4: Program Thermostat  
After the batteries are installed, the thermostat  
can be easily programmed in your hand, before  
it is installed on the wall.  
If you prefer to program the thermostat after it  
is installed on the wall, skip to page 18, and  
return later to this programming section.  
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 tem-  
perature during heating season, or a higher  
temperature during cooling season.)  
The following Personal Programming Chart  
(
pages 12 and 13) can be helpful for planning  
your program schedule of time and tempera-  
ture settings for various times of the day.  
Four time periods are available during week-  
days — WAKE, LEAVE, RETURN, and SLEEP.  
These periods can be seen individually on the  
display as you press the SET SCHEDULE key.  
RETURN is the time period you want the  
house at a comfortable temperature for  
activities before bedtime. When deciding what  
time to set for your RETURN period, include  
extra lead time, depending on the outside  
temperature and your furnace response time,  
WAKE is the time period you want the house at  
a comfortable temperature when you get up and  
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to give the furnace a head start to heat the  
house before you arrive home. (Again, this is  
higher heating or lower for cooling.)  
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.  
SLEEP is the time period you can set for an  
energy-saving temperature while you are  
sleeping. (Again, this is lower for heating or  
higher for cooling. For more comfortable  
sleeping, some people choose not to raise the  
cool temperature during the night.)  
If no program is entered for the weekends, the  
thermostat will operate on the weekday SLEEP  
program all weekend.  
Before programming, remove the clear plastic  
overlay covering the display.  
You will set one schedule for weekdays and  
another for weekends, because your require-  
ments will probably be different for each. Also,  
during weekends, only the WAKE and SLEEP  
time periods are available.  
When pressing the keys, use the ball of your  
finger or a soft pencil eraser. Using sharp  
fingernails or pencil points can damage the  
keypad.  
Fill in the times and temperatures you desire  
for weekdays and weekends. If you decide not  
to program the thermostat, it will automatically  
control heating at 68°F (20°C), and cooling at  
If you make an error at any time during  
programming, just press the RUN PROGRAM  
key, and continue again at the step where you  
left off.  
78°F (26°C), 24 hours a day. Also, you do not  
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Personal Programming Chart  
Heating Program  
2
Weekdays  
Start Time  
Heating Temperature  
WAKE  
1
LEAVE  
RETURN  
SLEEP  
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 any higher than 88°F (31°C) or any lower than 45°F (7°C).  
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Cooling Program  
2
Weekdays  
1
Start Time  
Heating Temperature  
WAKE  
1
LEAVE  
RETURN  
SLEEP  
Weekends  
WAKE  
1
SLEEP  
1
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.  
2
The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).  
NOTE: If you decide not to program the thermostat, it automatically controls heating at 68°F  
20°C), and cooling at 78°F (26°C), 24 hours a day.  
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This guide can be used for programming your new thermostat.  
NOTE: Batteries are required for operation and programming. When inserting batteries, set  
system switch to OFF. Remove the battery door (on the thermostat left side) using a coin  
at the bottom. Follow instructions on pages 8 and 9.  
Time  
Set Current Time/Day  
Ahead  
Back  
Set�  
To set the time, press and release Clock/Day once, then press  
until current time shows; to set  
the day,  
Time  
Ahead  
Set�  
Clock/Day  
Run�  
press and release  
again, then press  
until current day shows; then press  
.
Program  
Back  
Heating Program  
Weekday  
With system switch at HEAT, press and release Schedule once. WAKE, Mon-Fri and SET appear on  
the display.  
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Time  
Temp  
Ahead  
Warmer  
Press  
to program WAKE time and press  
to program WAKE temperature for  
Time  
Back  
Cooler  
Mon-Fri. Repeat sequence for LEAVE, RETURN, and SLEEP.  
Ahead  
Weekend  
Schedule  
Press  
until SAT SUN, WAKE and SET appear on the display. Press  
Temp  
to program  
Back  
Warmer  
WAKE time and  
for SLEEP.  
to program WAKE temperature for Sat-Sun. Repeat sequence  
Cooler  
Cooling Program  
With system switch at COOL, follow the same instructions as for the Heating Program.  
Run�  
Program  
After programming, adjust the fan and system switches, as desired. Press and release  
start the program.  
to  
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A quick guide for operating or making changes follows:  
NOTE: System switch must be set to Heat or Cool to perform the following.  
Temp  
Warmer  
Temporarily Change temperature for current period only— press  
;
TEMPORARY indicator  
Cooler  
Run�  
shows on display; canceling itself at the next scheduled change, or to cancel sooner press Program  
.
Temp  
Warmer  
Hold�  
;
Hold a temperature indefinitely (such as when on vacation)— press  
, then press  
Temp  
Run�  
Cooler  
HOLD appears on the display; to cancel, press Program  
.
Present  
Setting  
Check Current Temperature Setting— press  
. (When using TEMPORARILY CHANGE or  
HOLD, pressing this cancels your change.)  
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Weekday  
Weekend  
Check Programs— press Schedule  
,
Schedule repeatedly to view each time and temperature; then  
Run�  
press Program  
.
Weekday  
Weekend  
Schedule until program to cancel shows; then press  
Clear  
Cancel a program— press Schedule  
,
.
Usage  
Check Usage — Press  
for length of time heat or air conditioning has been running today  
since midnight; press again for yesterday’s usage, press again for cumulative;  
Run�  
Clear  
press  
to clear cumulative reading, if desired; then press Program .  
Permanently Change a program—Repeat steps in Heating Program section or Cooling Program  
section (pages 14 through 16), as applicable.  
Run�  
Return to normal program or start program — press Program  
.
Questions?  
Call Honeywell  
Customer Assistance  
1-800-468-1502.  
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Step 5: Adjust Fan Operation Switch, as Required  
The thermostat fan operation switch,  
your system is an electric heat system, set  
the switch to E. The E setting allows the fan  
to turn on immediately with the heating or  
cooling in a system where the G terminal is  
connected.  
labeled FUEL SWITCH (see illustration on  
page 20) is factory-set in the F position. This  
is the correct setting for most systems. If  
Step 6: Adjust System On-Time,  
°F/C  
°, as Required  
The system on-time is factory-set for a warm  
air, gas or oil heating system. If you are  
installing it on another type of system, adjust  
the on-time accordingly by setting screws A  
and B on the back of the thermostat. Use the  
heating system table shown in the illustration  
minimize room temperature swings. Setting  
the screw out one turn means turning the  
screw approximately 360° counterclockwise,  
or about one complete turn.  
In the unlikely event that you want a longer  
system on-time, readjust screws A and/or B  
as follows:  
(
page 20) as a guide. Optimize the system  
on-time according to the type of system to  
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First, turn in both screws completely, then  
adjust for system type:  
IMPORTANT  
When using a high efficiency furnace  
Warm Air Furnace—Set at the Hot Water  
setting (A—out one turn, B—leave in).  
Electric Furnace—Leave at the Warm Air  
Furnace setting (A—leave in, B—leave in).  
such as a 90% or greater AFUE  
(Average Fuel Utilization Efficiency)  
unit, adjust screw A out one turn and  
leave screw B in.  
NOTE: This thermostat does not have a  
setting for steam/gravity air. Cycles  
would not be long enough for accu-  
rate temperature control.  
 The thermostat is set to read the tempera-  
ture in degrees Fahrenheit. If readings are  
desired in degrees Celsius, adjust screw C  
out one turn, as shown in illustration.  
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THERMOSTAT BACK  
A
B
C
D
DISPLAY  
DISPLAY  
°
°
F� C–IN�  
C–OUT�  
TURN  
ADJUST SCREWS THROUGH HOLES�  
TO SELECT OPERATION DESIRED  
C
FUEL SWITCH�  
POSITION�  
1
HEATING SYSTEM  
WARM AIR� A–IN�  
FURNACE�  
B–IN�  
F�  
HOT WATER� A–OUT� B–IN�  
F�  
BOILER�  
1 TURN�  
ELECTRIC � A–IN  
FURNACE  
B–OUT�  
1 TURN�  
E�  
W
R
Y
G
FOR HIGH EFFICIENCY FURNACE (90%+ AFUE)�  
ADJUST: SCREW A–OUT ONE TURN�  
SCREW B–IN�  
FUEL SWITCH – F POSITION  
FUEL SWITCH  
F
E
Rc  
M8796  
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Step 7: Mount Thermostat Mounting Plate  
Position the mounting plate on the wall. Use  
a level to make sure the mounting plate is  
level. Use a pencil to mark the two  
mounting holes.  
Remove the mounting plate from the wall,  
and drill 3/16-inch holes in the wall (if  
drywall) as marked. For firmer material such  
as plaster or wood, drill 7/32-inch holes.  
Gently tap anchors (provided) into drilled  
holes until flush with the wall.  
Reposition mounting plate over the holes,  
pulling wires through the wiring opening.  
Loosely insert two mounting screws into  
the holes.  
WALL ANCHORS (2)  
WIRES THROUGH�  
WALL OPENING  
WALL  
MOUNTING�  
PLATE  
MOUNTING�  
SCREWS (2)  
M1718  
2
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Level for appearance only; thermostat  
functions properly even when not level.  
Tighten the mounting screws.  
LEVEL  
M1714A  
2
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Step 8: Wire Thermostat Terminals  
NOTE: All wiring must comply with local  
codes and ordinances. If unsure  
about household wiring procedures,  
call your local heating/air conditioning  
contractor.  
 In 5-wire installations only, be sure to  
remove the factory-installed jumper  
connecting terminals R and Rc.  
WIRE NUT SIZE FOR �  
METHOD TO INCREASE WIRE LENGTH  
TWO 18-GAUGE WIRES  
Refer to masking tape labels you placed on the  
wires when you removed your old thermostat.  
Match the letter of your old thermostat wire  
with the terminal of the corresponding letter  
on the back of your new thermostat. Refer  
to illustrations on pages 25 and 26. Hold the  
thermostat as shown to minimize need for  
wire extenders. If wires are still too short,  
use wire connectors (purchased locally) to  
extend wires. See illustration for guidelines  
on using wire extenders.  
WIRE �  
FROM�  
WALL  
6 IN. (152 MM) �  
OF 18-GAUGE �  
THERMOSTAT �  
WIRE. MATCH�  
INSULATION �  
COLORS �  
OR MARK �  
WIRE ENDS.  
M1715A  
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Loosen the terminal screws and slip each  
wire beneath its matching terminal. See  
illustration (lower right) for wire insertion  
technique. Securely tighten the terminals.  
Plug the hole in the wall with insulation to  
help prevent drafts from adversely affecting  
the thermostat operation.  
JUMPER (FACTORY-�  
INSERT�  
STRAIGHT �  
UNDER �  
INSTALLED) REMOVE �  
IF 5-WIRE SYSTEM  
5
/16 in. �  
(8 mm)�  
SCREW HEAD  
c R  
R
STRIP  
END OF WIRE �  
VISIBLE HERE  
M3002A  
G
W
Y
M1712A  
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2-WIRE HEAT-ONLY (JUMPER INTACT)  
4-WIRE HEAT/COOL (JUMPER INTACT)  
A
C
A
C
B
D
B
D
JUMPER  
W
R
Y
G
W
R
Y
G
JUMPER  
Rc  
Rc  
HEATING�  
RELAY OR�  
VALVE COIL  
HEATING�  
RELAY OR�  
VALVE COIL  
COOLING�  
CONTACTOR�  
COIL  
L1�  
(
HOT)  
1
L2  
FAN�  
RELAY  
L1�  
HOT)  
(
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND�  
OVERLOAD PROTECTION AS REQUIRED.  
M8793  
L2  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND�  
OVERLOAD PROTECTION AS REQUIRED.  
M8794  
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5-WIRE HEAT/COOL (JUMPER REMOVED)  
3-WIRE COOL-ONLY (JUMPER INTACT)  
A
C
A
C
B
D
B
D
W
R
Y
G
W
R
Y
G
JUMPER  
Rc  
Rc  
HEATING�  
RELAY OR�  
VALVE COIL  
COOLING�  
CONTACTOR�  
COIL  
FAN�  
RELAY  
COOLING�  
CONTACTOR�  
COIL  
FAN�  
RELAY  
L1�  
(HOT)  
L2  
1
1
L1�  
L1�  
(HOT)  
L2  
(
HOT)  
L2  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND�  
OVERLOAD PROTECTION AS REQUIRED.  
M8792  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND�  
OVERLOAD PROTECTION AS REQUIRED.  
M8795  
2
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Step 9: Mount Thermostat  
NOTE: To remove the thermostat from the  
wall, first pull out at the bottom of the  
thermostat, then remove the top.  
A. ENGAGE TABS AT TOP OF �  
B. PRESS LOWER EDGE �  
C. SWING OPEN COVER �  
TO CHECK �  
OPERATION.  
THERMOSTAT AND MOUNTING PLATE.  
OF CASE TO LATCH.  
M1734A  
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Step 10: Check Thermostat Operation after Programming and Installing  
Heating  
Cool  
Off  
Heat  
Do not check heating system  
Move the system switch to HEAT  
and the fan switch to AUTO.  
operation by jumpering thermostat  
terminals at the primary control  
such as the gas valve, zone valve,  
or oil burner control. This damages  
the thermostat, instead, jumper R  
and W wires at the thermostat.  
Auto  
On  
Press key until the setting is about  
Warmer  
10°F (6°C) above room tempera-  
ture. Heating should start and the  
fan should run after a short delay  
(
immediately if fan operation switch  
is set in E position).  
Press key until setting is about 10°F  
Cooler  
(6°C) below room temperature. The  
heating equipment should shut off.  
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Cooling  
Cool  
Off  
Heat  
To avoid possible compressor  
damage, do not operate the cooling  
system when outside temperature  
is below 50°F (10°C). See compres-  
sor manufacturer instructions for  
further information.  
Move the system switch to COOL  
and the fan switch to AUTO.  
Auto  
On  
Press key until setting is about  
Warmer  
Cooler  
1
0°F (6°C) below room tempera-  
NOTE: When cooling setting is  
changed, thermostat may  
delay up to five minutes  
before turning on the air  
conditioner. This delay  
ture. The cooling equipment and  
fan should start.  
Press key until the setting is about  
10°F (6°C) above room tempera-  
ture. The cooling equipment and  
fan should stop.  
protects the compressor.  
Cool  
Off  
Heat  
Move the system switch to OFF,  
with the fan switch at AUTO. The  
system and fan should be off.  
Auto  
On  
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Step 11: Set Fan and System Switches  
First set the fan switch.  
Auto  
On  
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 on low with the furnace.  
Exception: If the fan operation switch on the  
back of the thermostat is set to the  
E position (see page 20), the fan  
operates only with the furnace.  
Auto  
On  
FAN ON: The fan runs continuously. Use for  
improved air circulation during special occa-  
sions or for more efficient electronic air  
cleaning. (In a heat-only system, fan runs  
continuously only if the fan relay is connected  
to the thermostat.)  
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Then set the system switch.  
Cool  
Cool  
Cool  
Off  
Off  
Off  
Heat  
Heat  
Heat  
COOL: The thermostat controls your air  
conditioning system.  
OFF: Both the heating and air conditioning  
systems are off.  
HEAT: The thermostat controls your heating  
system.  
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ITf…roubleshooting Guide  
Display will not come on.  
Then…  
 Set the system switch to OFF. Remove batteries. Insert  
backward for at least five seconds to reset thermostat.  
Replace batteries correctly. 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  
 You have reached the temperature setting limit. The  
setting range is 45°F to 88°F (7°C to 31°C).  
8
8°F (31°C) during programming.  
Temperature change occurs at the  
wrong times.  
 Check the 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  
necessary.  
Heating will not come on.  
 Check that the switch on the thermostat is set to HEAT.  
Check the system fuse or circuit breaker and replace or  
reset if necessary.  
Check for correct wiring and good connections.  
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Heating will not come on.  
Continued)  
 Jumper wires R and W. If heat does not come on, contact  
(
your heating dealer.  
If display is blank or shows bAt Lo, install fresh batteries.  
If temperature setting is higher than current temperature,  
and the display shows HEAT, contact Honeywell  
Customer Assistance at 1-800-468-1502.  
Cooling will not come on.  
 Check that the switch on the thermostat is set to COOL.  
Check the system fuse or circuit breaker and replace or  
reset if necessary.  
Check for correct wiring and good connections.  
Jumper wires Rc and Y. If cooling does not come on,  
contact your cooling dealer.  
If display is blank or shows bAt Lo, install fresh batteries.  
The thermostat has a built-in time delay on cooling. Allow  
five to ten minutes after changing the setting before the  
air conditioner starts.  
Make sure the outdoor disconnect is energized (on).  
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Cooling will not come on.  
Continued)  
 If temperature setting is lower than the current  
temperature, and the display shows COOL, move the  
system switch from COOL to OFF for ten minutes. After  
ten minutes, return the switch to the COOL position. If the  
air conditioner comes on, compressor may have reached  
its high limit temperature protection and shut down. If the  
air conditioner does not come on after the ten minutes and  
the display shows COOL, contact Honeywell Customer  
Assistance at 1-800-468-1502.  
(
If 2- or 4-wire installation, verify R-Rc jumper is installed.  
The house is too warm or too cool.  
 Press PRESENT SETTING key to check the current  
temperature setting.  
If desired, change the temperature setting. See page 16.  
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. (Check to  
make sure system on-time is set correctly according to  
page 18 and 19.)  
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The furnace cycles too frequently or  Readjust system on-time according to instructions on  
the system cycle length is too short  
or too long.  
pages 18 and 19.  
The thermostat's current setting  
does not match the display  
temperature to within ±1°.  
 Check that the wiring hole in the wall behind the wallplate  
was plugged with insulation to prevent drafts that might  
adversely affect the thermostat operation.  
Be aware that it is normal for the current setting and  
display temperature to differ on occasion.  
During recovery from setback or setup, setting and  
display temperatures may differ for up to 30 minutes after  
recovery period.  
Incorrect room temperature showing  Make sure the hole behind the thermostat is plugged with  
on thermostat display.  
insulation to help prevent drafts from adversely affecting  
the thermostat operation.  
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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TYPICAL ENERGY SAVINGS FOR REPRESENTATIVE CITIES IN THE U.S. AND CANADA  
Savings for Once-A-Day�  
0°F (5°C) decrease  
Savings for Twice-A-Day�  
10°F (5°C) decrease*  
Savings for 5°F (3°)�  
summer increase�  
1
30%  
28%  
26%  
24%  
22%  
2
0%  
8%  
1
1
6%  
4%  
1
1
2%  
0%  
1
8
%
%
%
6
4
2
% Minneapolis�  
St. Paul�  
Montreal�  
Ottawa�  
Toronto  
Edmonton�  
Regina�  
Winnipeg  
Calgary�  
Halifax  
Vancouver  
Buffalo�  
Cleveland�  
Milwaukee  
Denver�  
Des Moines � Chicago�  
Omaha�  
Salt Lake�  
City  
Boston�  
Cincinnati�  
Kansas City� Philadelphia� Portland�  
Wash., D C  
New York�  
Louisville�  
San  
Francisco  
Dallas�  
Atlanta  
Los Angeles  
San Diego  
Moncton�  
North Bay�  
Quebec�  
Detroit�  
Pittsburgh�  
Indianapolis  
St. Louis�  
Columbus  
Seattle  
St. John's  
*Based on 10°F (5°C) decrease—(5°F [3°C] decrease�  
gives approximately 55 percent of these savings).  
M2416A  
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Limited One-Year Warranty  
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.  
If the product is defective,  
(
i) return it, with a bill of sale or other dated proof of purchase, to the retailer 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  
in Canada: Honeywell Limited/Honeywell Limitée  
Product Services ON30  
1
050 Berkshire Lane  
155 Gordon Baker Road  
North York, Ontario M2H 2C9  
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 any 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. In Canada, write Retail Products ON30, Honeywell  
Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 2C9  
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Home and Building Control  
Honeywell Inc.  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
155 Gordon Baker Road  
North York, Ontario  
Helping You Control Your World  
Honeywell Plaza  
P.O. Box 524  
Minneapolis, MN 55408-0524  
M2H 2C9  
6
9-1012 6-96 J.S. Printed in U.S.A.  
Printed on recycled paper containing at �  
least 10% post-consumer paper fibers.  
Copyright © 1996 Honeywell Inc. All Rights Reserved ® U.S. RegisteredTrademark  

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