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T8131A,B Programmable Thermostat
OWNER’S GUIDE
Weekday/Weekend (5-day/ 2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
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Welcome to the world of comfort and energy
savings with your new Honeywell programmable thermostat.
By following the programing instructions in this
manual, your new thermostat will automatically
control the temperature in your home, keeping
you comfortable while saving energy.
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Table of Contents
Page
Program the Thermostat ................................................................................................................. 4
Adjust Fan Operation Switch........................................................................................................... 13
Adjust System On-Time, °F/°C........................................................................................................ 13
Set Fan and System Switches ........................................................................................................ 18
Install Batteries................................................................................................................................ 19
Troubleshooting Guide .................................................................................................................... 21
Limited One-Year Warranty............................................................................................................. 22
Customer Assistance ...................................................................................................................... 24
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Program the Thermostat
When batteries are installed, your thermostat
can be programmed in your hand, before it is
mounted on the wall.
If you would prefer to program the thermostat
after it is mounted on the wall, (see Mount
Thermostat section), and return later to this
programming section.
Refer to the personal Program Schedule
section 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. These periods can
be seen individually on the display as you
press the Set Schedule key.
WAKE is the time period you want the house at
a comfortable temperature when you get up
and 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.)
LEAVE is the time period you can set for an
energy-saving temperature while you are away
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at work or school. (This will be a lower temperature during heating season, or a higher
temperature during cooling season.)
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,
to give the furnace a head start to heat the
house before you arrive home. (Again, higher
for heating or lower for cooling.)
SLEEP is the time period you can set for an
energy-saving temperature while you are
sleeping. (Again, lower for heating or higher for
cooling. For more comfortable sleeping, some
homeowners choose not to raise the cool
temperature during the night.)
You will set one schedule for weekdays and
another for weekends, because your requirements are probably different for each.
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
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
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it. For example, a house that is occupied during
weekdays would only require programs for
WAKE and SLEEP.
Before programming, remove the clear plastic
overlay covering the display.
When pressing the keys, use the ball of your
finger or a soft pencil eraser.
NOTE: Using sharp fingernails or pencil
points can damage the keypad.
If you make an error at any time during
programming, press the Run Program key and
continue again at the last step.
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Program Schedule
HEATING PROGRAM SCHEDULE
Weekdays Start Time Heating Temperature
WAKE
1
2
LEAVE
RETURN
1
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).
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COOLING PROGRAM SCHEDULE
Weekdays Start Time Cooling Temperature
WAKE
1
2
LEAVE
RETURN
1
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 the
system switch to OFF. Remove the battery door (on the thermostat left side) using a coin
at the bottom. Follow the instructions on pages 16 and 19.
Time
Set Current Time/Day
To set the time, press and release once, until current time shows; to set day, press
Set
Clock/Day
Time
and release again, until current day shows; then press .
Set
Clock/Day
Ahead
Back
Ahead
Back
Run
Program
Heating Program
With system switch at HEAT, press and release once. WAKE, MON-FRI and SET appear on
Set
Schedule
the display.
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Time
Ahead
Temp
Warmer
Use to program WAKE time and to program WAKE temperature for Mon-Fri.
Back
Cooler
Repeat sequence for LEAVE, RETURN, and SLEEP.
Press until SAT, SUN, WAKE and SET appear on the display. Use to program
Set
Schedule
Time
Ahead
Back
Temp
WAKE time and to program WAKE temperature for SAT-SUN. Repeat sequence for SLEEP.
Warmer
Cooler
Cooling Program
With system switch at COOL, follow the same instructions as for the Heating Program.
After programming, adjust fan and system switches, as desired. Press and release to start
Run
Program
the program.
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A quick guide for operating or making changes follows:
NOTE: Set system switch to Heat or Cool to perform the following:
Temp
Temporarily Change temperature
for current period only
—press ; TEMPORARY
Warmer
Cooler
indicator shows on display; this is cancelled at next scheduled change, or to cancel sooner,
press .
Hold a temperature indefinitely (such as when you are on vacation)—press , ;
HOLD appears on display; to cancel, press .
Check Current Temperature Setting—press . (When using TEMPORARILY CHANGE or
Run
Program
Run
Program
Program
Run
Hold
Temp
Temp
Warmer
Cooler
HOLD, pressing this cancels your change.)
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Check Programs—press repeatedly to see each time and temperature; then press .
Set
Schedule
Run
Program
Time
Cancel a program—press until program to cancel shows; then press together.
Set
Schedule
Ahead
Back
Permanently Change a program—Repeat steps in Heating Program or Cooling Program (page 9
and 10), as applicable.
Return to normal program or start program—press .
Run
Program
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Adjust Fan Operation Switch
쐃 The thermostat fan operation switch,
labeled FUEL SWITCH (see illustration on
page 14), is factory-set in the F position.
This is the correct setting for most
systems. If 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.
Adjust System On-Time, °F/°C
쐃 The thermostat 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 DIP switches 1 and 2 on the back
of the thermostat. Use the heating
system table on the thermostat back as a
guide.
Optimize the system on-time according to the
type of system to minimize room temperature
swings.
In the unlikely event that you want a longer
furnace on-time, readjust DIP switches 1 and 2
as follows:
•Warm Air Furnace—set at the Hot Water
setting (1—OFF, 2—ON).
• Electric Furnace—leave at the Warm Air
Furnace setting (1—ON, 2—OFF).
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NOTE: This thermostat does not
have a setting for steam/
gravity air. Cycles would
not be long enough for
accurate temperature
control.
IMPORTANT
When using a high
efficiency furnace such as
a 90% or greater AFUE
(Average Fuel Utilization
Efficiency) unit, adjust
DIP switch 1 Off and
DIP switch 2 On.
DISPLAY F
DISPLAY C
FUEL SWITCH
F
3 - ON
3 - OFF
THERMOSTAT BACK
ON
1
1
2
2
3
3
OFF ON
E
C
HEATING
SYSTEM
WARM AIR
FURNACE
HOT WATER OR
HIGH EFFICIENCY
ELECTRIC
FURNACE
W Y G
W Y G
C R R
FUEL SWITCH
DIP SWITCH
POSITION
POSITION
1 - ON 2 - ON F
1 - OFF 2 - ON F
1 - ON 2 - OFF E
C
R
C
M20638
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Set Fan and System Switches
First set the fan switch.
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 Fan Operation Switch on the back
of the thermostat is set to the E position (see
page 21), the fan operates with furnace only.
ON: The fan runs continuously. Use
for improved air circulation
during special occasions or for
Auto On
Auto On
more efficient electronic air cleaning. (In a
heat-only system, the fan runs continuously
only when the fan relay is connected to the
thermostat.)
Then set the system switch.
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.
HeatCool Off
HeatCool Off
HeatCool Off
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Install Batteries
IMPORTANT
Batteries must be installed for programming and operating the thermostat and heating/cooling system.
As the batteries are
running low, a
bAt Lo
indicator
flashes
for one to
two
months
before the
batteries run out
completely.
M1719C
REMOVING
BATTERY
DOOR
Replace the batteries as soon as possible after
the indicator starts flashing.
After the batteries are completely dead, the
bAt Lo
indicator disappears, leaving the display
completely blank and the heating and/or
cooling system not operating.
• Use two AA alkaline batteries; nonalkaline
batteries do not last as long.
• Make sure the thermosat is set to the OFF
position.
• Use a coin to remove the battery door.
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To remove batteries, press down on the left ends
of batteries. If you insert the new batteries within
20 to 30 seconds of removing the old ones, you
do not need to reprogram the thermostat.
However, if the display is blank, the batteries are
dead or incorrectly installed and you need to
reprogram.
• Install the fresh batteries, as shown, making
sure positive and negative terminals are
oriented correctly.
• Replace the battery door.
INSTALL TWO AA ALKALINE
BATTERIES AS SHOWN
M1713
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Troubleshooting Guide
IF… THEN…
Display will not come on. ■ Check that the green light emitting diode (LED)
located to the left of the LCD is lit, indicating the
thermostat is powered properly.
Temperature display will not go lower ■ You have reached the temperature setting limit.
than 45°F (7°C) or higher than 88°F The setting range is 45°F to 88°F (7°C to 31°C).
(31
°C) during programming.
Temperature change occurs at the ■ Check the program times for the period in
wrong times. 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 green LED is lit.
■ Check that the switch on the thermostat is set to
HEAT.
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Heating will not come on (Cont). ■ Check the system fuse or circuit breaker and
replace or reset, if necessary.
■ Check for correct wiring and good connections.
■ If temperature setting is higher than current
temperature and displays HEAT, contact Honeywell
Customer Relations at 1-800-468-1502.
Cooling will not come on. ■ Check that the green LED is lit.
■ 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.
■ The thermostat has a built-in time delay on cooling.
Allow five to ten minutes after changing the setting
before the air conditioner starts.
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Cooling will not come on (Cont). ■ If temperature setting is lower than current
temperature, and displays COOL, move system
switch from COOL to OFF for ten minutes. After
ten minutes, return switch to COOL position. If the
air conditioner comes on, compressor could have
reached its high limit temperature protection and
shut down. If the air conditioner does not come on
after ten minutes and displays COOL, contact
Honeywell Customer Relations at 1-800-468-1502.
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 11.
SYSTEM ON indicator is lit, but no ■ Allow time for the furnace to heat up and the fan to
heat is coming from the registers. come on before checking for heat at the register.
(Check to make sure system on-time is set
correctly according to pages 13 and 14.)
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The furnace or air conditioner ■ Contact your heating or air conditioner contractor.
on-time is too short or too long. If further assistance is needed, call Honeywell
Customer Relations at 1-800-468-1502.
The thermostat’s current setting ■ Check that the wiring hole in the wall behind the
does not match the display wallplate was plugged with insulation to prevent
temperature. drafts that could adversely affect thermostat
operation.
■ Be aware that it is normal for the current setting
and display temperature to differ occasionally.
bAt Lo
remains on display after ■ Remove batteries. Wait one hour. Install fresh
fresh batteries are installed. alkaline batteries.
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TYPICAL ENERGY SAVINGS FOR REPRESENTATIVE CITIES IN THE U.S. AND CANADA
Savings for Once-A-Day
10°F (5°C) decrease
30%
28%
26%
24%
22%
20%
18%
16%
14%
12%
10%
8%
6%
Approximate percentage of energy cost savings
4%
2%
Edmonton
Regina
Winnipeg
Calgary
Halifax Vancouver Denver
Moncton
North Bay
Quebec
St. John's
Minneapolis
St. Paul
Montreal
Ottawa
Toronto
Buffalo
Cleveland
Milwaukee
Savings for Twice-A-Day
10°F (5°C) decrease*
Boston
Des Moines
Chicago
Omaha
Detroit
Salt Lake
Pittsburgh
City
Indianapolis
*Based on 10°F (5°C) decrease—(5°F (3°C) decrease
gives approximately 55 percent of these savings).
Cincinnati
Kansas City
St. Louis
Columbus
New York
Philadelphia
Seattle
Savings for 5°F (3°)
summer increase
Louisville
Portland
Wash., D C
San
Francisco
Dallas
Atlanta
Los Angeles
San Diego
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 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 Return Goods
Dock 4, MN10-3866
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.
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 Honeywell Customer Relations, 1985 Douglas Drive North, MN10-1461, Golden
Valley, MN 55422 or call 1-800-468-1502. In Canada, write Retail Products ON30, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive,
Scarborough, Ontario M1V 4Z9.
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NOTICE: This equipment is a Class B digital apparatus, which complies with Canadian Radio
Interference Regulations, CRC c.1374.
Customer Assistance
For all questions concerning this thermostat, please read and follow the instructions. If additional
assistance is needed, call Honeywell Customer Relations toll-free at 1-800-468-1502.
Before you call, please have the following information available—thermostat model number and
date code, type of heating/cooling system (for example, hot water, warm air, oil, or gas), and
number of wires connected to the thermostat.
Automation and Control Products
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422
69-1636-1 9-03 G.H. Printed in Mexico
Copyright © 2003 Honeywell International Inc. All Rights Reserved
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario
M1V 4Z9
www.honeywell.com/yourhome
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