© 2020 Thermostat Guide – troubleshooting, error codes, repair. Trane Thermostat Error Codes error codes are thermostat or heating/cooling device and model dependent. Used for other system alerts: Maint displayed. 2) Adjust cycle rates and aggressive recovery features in the advanced installer set up. Adjust the temperature by pressing either the ▲ or ▼ key. Indoor temperature display needs calibration. 1) System mode is not set to heat/Auto or set- point is set too low. LED On, LED 4 RED: Alert LED. Check Installer Setup Number 0170 and make sure correct System type is chosen. Set system Selection to correct position. 1) Wait a minute for blower delays and recheck registers. Thermostat displays an alert code on the screen. LED On, LED 2 Green: System Stage display: Aux Heat displayed, LED 3 Green: Run/Hold/ESM display. Heating or Cooling is displayed, but no warm or cool air is coming from the registers. Room temperature overshoots when the Heat/Cool setting is changed more than 2°. – Ecobee Thermostat – Emerson Thermostat – Honeywell Thermostat – Hunter Thermostat – Lennox Thermostat – Lux Thermostat – Nest Thermostat – Nuheat Thermostat – Robertshaw Thermostat – Trane Thermostat – Totaline Thermostat – Venstar Thermostat – York Thermostat – White Rodgers Thermostat – Other troubleshooting Check power to the heating or cooling equipment. 2) Check indoor unit for failures (such as tripped heating limit). 3) Check for broken or shorted thermostat wire. Used for other system alerts: Filter displayed, LED 4 RED: Alert LED.

Wait up to five minutes for the system to respond. 1) Set mode to heat and raise the setpoint above the room temperature. Control cannot respond fast enough to prevent overshooting. 1) If indoor humidity is higher than desired set- point.

Trane thermostat error code 91. Indoor humidity display needs calibration. 1) There is a fan delay as the heating or cooling equipment turns on. did you chose that one?

Try setting that switch last ten errors (active and inactive). 1) Compare heat load calculation to equipment chosen. 1) Check the location of the thermostat for drafts.

Check that the SYSTEM switch on the thermostat is set to Heat or Cool. Used for other system alerts: No display, LED 4 RED: Alert LED. 090 Data interface is continuously busy.

If you want to perform Trane thermostat troubleshooting, use one of the tables from this page: they provide step-by-step fixing instructions for the most popular Trane thermostat models. 1) System mode is not set to cool/Auto or the setpoint is too high. 2) Wait for 5 minutes and recheck cooling equipment. Shows state of Schedule Run/Hold Mode: ESM displayed, (Energy Savings Mode) Temperature preset is active. 1) Fan mode is set to On. LED 1 Green: System Operation display: Sys Off displayed, LED 1 Green: System Operation display: WAIT displayed, Minimum Off Time (MOT)delay is active; LED Off, LED 1 Green: System Operation display: Cool On displayed, LED 1 Green: System Operation display: Heat On displayed, LED 2 Green: System Stage display: No display, LED 2 Green: System Stage display: 2nd Stg displayed, Stage 2 heating or cooling is active.

1) Check wiring between R & B to see if R & D or B & D have been reversed. Comfort control does not respond when touch areas are pressed. In case whereby there is a thermostat issue, one should be very careful when replacing the thermostat. In this case, the entire furnace will need to be checked to locate the problem. 3) Check for broken or shorted thermostat wire. Display will not come on: Loss of 24VAC between R & B at the thermo- stat. 1) Set mode to cool and lower the setpoint below the room temperature. Circulate or Clean mode. Calibrate humidity sensor from the thermostat menu. Check if the fuse is blown— replace the fuse. 2) Relocate thermostat (or use remote sensor) if thermostat is in "dead" spot (poor or no air circulation). Loss of 24VAC between R & B at the thermo- stat. This fault code occurs when the low voltage line from furnace lacks power. Alert Code is present. 2) Minimum off time delay is being enforced. The upper or lower temperature limits were reached. Thermostat displays an alert code on the screen. Shows state of Schedule Run/Hold Mode: Hold displayed, LED 3 Green: Run/Hold/ESM display. Check Installer Setup Numbers 0600 and 0610; modify as needed. Comfort control minimum off- time is activated. System selection is not set to Heat or Cool. Check Installer Setup Number 0670 to change keypad locked options. Comfort control is calling for Heat (Heat on) or Cool (Cool on) but no heating or cooling is running. 1) Seal all air leaks behind thermostat. 2) Cycles per hour or aggressive recovery is improperly set. Relocate thermostat or apply remote indoor temperature sensor. Verify operation of equipment in System Test mode. Check the Alert icons in the diagnostic screen. 1) Check thermostat settings to see if fan is set to On. 2) Wait for 5 minutes and recheck heating equipment.

1) Check wiring between R & B to see if R & D or B & D have been reversed. Each manual enlists the most widespread technical failures, suggests possible causes and instructs on how to solve the problem. Check if the circuit breaker is tripped—reset the circuit breaker. 2) Check transformer for 24VAC output. Circulate or Clean mode. Calibrate temperature sensor from thermostat menu. | Contact, Loss of 24VAC between R & C at the Control, 3) Check for broken or shorted thermostat wire, 1) Indoor temperature display needs calibrating (always allow 1 hour before calibrating after any power cycle), 2) Heat from the touchscreen is being trapped within the body of the control, 2) Relocate the control away from any competing air sources or redirect the air sources away from the control, Room temperature overshoots the desired setpoint in cooling mode, 1) The delta ‘Off in cooling mode is set to a negative number, 1) Intended operation; if objectionable, change the delta “Off” to 0 degrees, 2) Cooling overshoot is enabled and the indoor RH is higher than the target cooling RH, 2) Intended operation: if objectionable, disable cooling over- shoot or raise cooling target RH, 3) Minimum compressor on time has not been met, 3) Intended operation; if objectionable, lower minimum on time (lowest setting available is 3 minutes), Room temperature overshoots the desired setpoint in heating mode, 1) The delta ‘Off in heating mode is set to a positive number, 1) Intended operation; if objectionable, change the delta “OfT' to 0 degrees, 2) Minimum compressor/indoor heat on time has not been met, 2) Intended operation; if objectionable, lower the minimum on time (lowest setting available is 3 minutes), 1) System mode is not set to Cool/Auto or setpoint is set too high, 1) Select the correct system mode and/or lower the setpoint, 2) Delta “On" for cooling is set too high, 2) Change the delta “On" setting for cooling mode, 3) Minimum off time delay is being enforced, 3) Intended operation; if objectionable, lower the minimum off time delay (lowest setting is 5 minutes), 1) System mode is not set to Heat/Auto or setpoint is set too low, 1) Select the correct system mode and/or raise the setpoint, 2) Delta “On" for heating is set too high, 2) Change the delta “On" setting for heating mode, Heating or Cooling is being displayed, but no air coming from registers/ vents, 1) Wait one minute for blower delay to end, then recheck register/grills, 1) Intended operation; if objectionable, change fan mode to "Auto", 1) Smart continuous fan is enabled and the indoor humidity is higher than the cooling target RH (SCF will be displayed on fan mode button), 1) Intended operation; if objectionable, disable SCF or raise cooling target humidity. The system uses a so called “communicating” thermostat, which has a very … Heating or cooling equipment is not operating. Cooling or Heating cycles too fast or too slow (narrow or wide temperature swings). Check the Alert icons in the diagnostic screen.

Check Installer Setup Number 0170 and make sure correct system type is chosen. Error alert codes are also explained. 1) Oversized heating/cooling equipment under current conditions. the blower will cycle off with the equipment. This is not usually due to a thermostat failure.

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