Honeywell T8131A Programmable Thermostat Owner’s Manual
Troubleshooting Guide
IF…
Display will not come on.
THEN…
■ 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
than 45°F (7°C) or higher than 88°F
(31°C) during programming.
■ You have reached the temperature setting limit.
The setting range is 45°F to 88°F (7°C to 31°C).
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 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
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 pages 13 and 14.)
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The furnace or air conditioner
on-time is too short or too long.
■ Contact your heating or air conditioner contractor.
If further assistance is needed, call Honeywell
Customer Relations at 1-800-468-1502.
The thermostat’s current setting
does not match the display
temperature.
■ Check that the wiring hole in the wall behind the
wallplate was plugged with insulation to prevent
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
fresh batteries are installed.
■ Remove 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
10°F (5°C) decrease
Savings for Twice-A-Day
10°F (5°C) decrease*
Savings for 5°F (3°)
summer increase
30%
28%
26%
24%
22%
20%
18%
16%
14%
12%
10%
8%
6%
4%
2%
Calgary
Halifax
Vancouver
Buffalo
Denver
Des Moines Chicago
Boston
New York
Louisville
Portland
San
Francisco Atlanta
Dallas
Los Angeles San Diego
Minneapolis Edmonton
Cincinnati
St. Paul
Montreal
Ottawa
Regina
Moncton
North Bay
Quebec
Cleveland
Milwaukee
Kansas City Philadelphia
Wash., D C
Omaha
Salt Lake
City
Detroit
St. Louis
Columbus
Seattle
Winnipeg
Pittsburgh
Indianapolis
Toronto
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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| General | Details |
|---|---|
| Name | Honeywell T8131A Programmable Thermostat Owner’s Manual |
| Make | Honeywell |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.15 MB |
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