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11 68-0148—1
T8131A,B,C; T8132A,B,C
CHECKOUT AND SETTINGS • TROUBLESHOOTING
SETTINGS AND ADJUSTMENTS
Set the Fan and System Switches
First set the fan switch FAN AUTO: Normal setting for most homes. A single-speed
fan will turn on automatically with the air conditioner or
furnace. A two-speed fan will usually run on high with the
air conditioner and on low with the furnace.
FAN ON: The fan runs continuously. Use for improved air
circulation during special occasions or for more efficient
electronic air cleaning.
Then set the system switch. COOL: The thermostat controls the air conditioning system.
OFF: Both the heating and air conditioning systems are off.
HEAT: The thermostat controls the heating system.
Troubleshooting
IF… THEN…
Display will not come on. T8131
• Check that green LED is lit.
T8132
• 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.
Temperature display will not go T8131/T8132
lower than 45° F [7° C] or higher • The temperature setting limit has been reached. The setting range is 45° F
than 88° F [31° C] during to 88° F [7° C to 31° C].
programming.
Heating will not come on. T8131
• Check that green LED is lit.
T8132
• If display is blank or says “bAt Lo,” install fresh batteries.
T8131/T8132
• Check that switch on thermostat is set to HEAT.
• Check the system fuse or circuit breaker and replace or reset if necessary.
• If temperature setting is higher than current temperature, and SYSTEM
ON indicator is lit, see furnace manufacturer instructions.
Cooling will not come on. T8131
• Check that green LED is lit.
T8132
• If display is blank or says “bAt Lo,” install fresh batteries.
• If 2- or 4-wire installation, verify that R-Rc jumper is installed.
T8131/T8132
• Check that switch on thermostat is set to COOL.
• Check the system fuse or circuit breaker and replace or reset if necessary.
• The thermostat has a built-in time delay on cooling. Allow five to ten min-
utes after changing the setting before the air conditioner starts.
• If temperature setting is lower than current temperature, and SYSTEM ON
indicator is lit, move system switch from COOL to OFF for ten minutes.
HeatCool Off
HeatCool Off
HeatCool Off
Auto On
Auto On