This is not usually due to a thermostat failure. Adjust the temperature by pressing either the ▲ or ▼ key. 2) Check transformer for 24VAC output. Heating or cooling equipment is not operating. System selection is not set to Heat or Cool. Check Installer Setup Number 0670 to change keypad locked options. 1) Check wiring between R & B to see if R & D or B & D have been reversed. Circulate or Clean mode. Used for other system alerts: No display, LED 4 RED: Alert LED. Shows state of Schedule Run/Hold Mode: Hold displayed, LED 3 Green: Run/Hold/ESM display. Check the Alert icons in the diagnostic screen. Check if the circuit breaker is tripped—reset the circuit breaker. Check if the fuse is blown— replace the fuse. Wait up to five minutes for the system to respond. Comfort control minimum off- time is activated. 2) Check indoor unit for failures (such as tripped heating limit). Trane Thermostat Error Codes error codes are thermostat or heating/cooling device and model dependent. Check the Alert icons in the diagnostic screen. Used for other system alerts: Filter displayed, LED 4 RED: Alert LED. 1) If indoor humidity is higher than desired set- point. | 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. 2) Cycles per hour or aggressive recovery is improperly set. 2) Wait for 5 minutes and recheck heating equipment. 2) Relocate thermostat (or use remote sensor) if thermostat is in "dead" spot (poor or no air circulation). Alert Code is present. – 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 Thermostat displays an alert code on the screen. Display will not come on: Loss of 24VAC between R & B at the thermo- stat. 1) Check the location of the thermostat for drafts. Used for other system alerts: Maint displayed. 1) Wait a minute for blower delays and recheck registers. 090 Data interface is continuously busy. Check Installer Setup Number 0170 and make sure correct system type is chosen. Loss of 24VAC between R & B at the thermo- stat. 1) Check wiring between R & B to see if R & D or B & D have been reversed. Error alert codes are also explained. Shows state of Schedule Run/Hold Mode: ESM displayed, (Energy Savings Mode) Temperature preset is active. Trane thermostat error code 91. Set system Selection to correct position. the blower will cycle off with the equipment. Cooling or Heating cycles too fast or too slow (narrow or wide temperature swings). Calibrate temperature sensor from thermostat menu. Each manual enlists the most widespread technical failures, suggests possible causes and instructs on how to solve the problem. 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. 3) Check for broken or shorted thermostat wire. 1) System mode is not set to cool/Auto or the setpoint is too high. Try setting that switch last ten errors (active and inactive). Comfort control does not respond when touch areas are pressed. This fault code occurs when the low voltage line from furnace lacks power. 2) Adjust cycle rates and aggressive recovery features in the advanced installer set up. Comfort control is calling for Heat (Heat on) or Cool (Cool on) but no heating or cooling is running. In case whereby there is a thermostat issue, one should be very careful when replacing the thermostat. Check power to the heating or cooling equipment. LED On, LED 4 RED: Alert LED. 2) Minimum off time delay is being enforced. 1) Set mode to heat and raise the setpoint above the room temperature. © 2020 Thermostat Guide – troubleshooting, error codes, repair. Verify operation of equipment in System Test mode. Calibrate humidity sensor from the thermostat menu. Thermostat displays an alert code on the screen. 1) Fan mode is set to On. Room temperature overshoots when the Heat/Cool setting is changed more than 2°.
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