Trane Smart Thermostats Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E0
Thermostat displays E0 and will not communicate with the HVAC system or Trane Home app
Communication Bus Failure
E1
Thermostat displays E1 and will not control heating or cooling
Indoor Unit Communication Error
E10
Thermostat displays E10 and system may not energize any outputs
Low Voltage Power Fault
E11
Thermostat displays E11 and certain stages of heating or cooling will not engage
Output Relay Failure
E12
Thermostat displays E12 and may show incorrect date/time or scheduling issues
Real-Time Clock / Memory Error
E13
Thermostat displays E13 and will not complete pairing with Trane Home / Nexia app
Cloud Connectivity / Account Binding Error
E2
Thermostat displays E2 and cooling or heating from the outdoor unit is disabled
Outdoor Unit Communication Error
E20
Thermostat displays E20 and dehumidification or humidification functions are disabled
Humidity Accessory Communication Error
E21
Thermostat displays E21 and ventilation/ERV control is not available
Ventilation System Communication Error
E3
Thermostat displays E3 and system may run in limited or backup mode
System Configuration Error
E30
Thermostat displays E30 and system operation is locked out intermittently
Lockout Due to Excessive Faults
E4
Thermostat displays E4 and may shut down heating or cooling
High Temperature Lockout / Internal Overheat
E40
Thermostat displays E40 and shows a message about incompatible equipment
Equipment Compatibility Error
E5
Thermostat displays E5 and may not respond to touch or commands intermittently
Internal Thermostat Hardware Fault
E50
Thermostat displays E50 and touchscreen is unresponsive or frozen
Touchscreen Interface Failure
E6
Thermostat displays E6 and outdoor temperature is not shown or is incorrect
Outdoor Temperature Sensor Failure
E60
Thermostat displays E60 and indicates a problem with auxiliary heat control
Auxiliary Heat Control Fault
E7
Thermostat displays E7 and indoor temperature reading is obviously wrong or missing
Indoor Temperature Sensor Failure
E8
Thermostat displays E8 and humidity readings are missing or inaccurate
Indoor Humidity Sensor Failure
E9
Thermostat displays E9 and will not complete Wi‑Fi setup or loses connection repeatedly
Wi‑Fi Module Failure
Symptom
Thermostat backlight or display flickers when HVAC equipment starts
Voltage Sag on Control Circuit
Symptom
Thermostat calls for cooling but outdoor unit does not start
Cooling Call Not Reaching Outdoor Unit
Symptom
Thermostat calls for heat but furnace or air handler does not start
Heating Call Not Reaching Indoor Unit
Symptom
Thermostat displays outdoor temperature as -- or blank even though a sensor is installed
Open Outdoor Sensor Circuit
Symptom
Thermostat displays outdoor temperature but value is obviously wrong
Shorted or Miscalibrated Outdoor Sensor
Symptom
Thermostat does not control whole-home dehumidifier or overcools to dehumidify
Dehumidification Control Misconfiguration
Symptom
Thermostat does not control whole-home humidifier even when humidity is low
Humidifier Control Failure
Symptom
Thermostat does not follow programmed schedule or changes modes unexpectedly
Scheduling / Mode Logic Error
Symptom
Thermostat does not respond to touch or buttons, but display appears normal
Unresponsive User Interface
Symptom
Thermostat emits a burning smell or feels unusually hot to the touch
Overheating Thermostat Electronics
Symptom
Thermostat fan setting ON does not run the blower continuously
Fan Control Output Failure or Misconfiguration
Symptom
Thermostat frequently cycles the system on and off (short cycling)
Improper Cycle Rate / Differential Settings
Symptom
Thermostat frequently disconnects from Wi‑Fi or Trane Home app
Intermittent Network Connectivity
Symptom
Thermostat has power but screen is very dim or backlight flickers
Insufficient Control Voltage / Backlight Power Issue
Symptom
Thermostat is completely blank and does not power on
No Low-Voltage Power to Thermostat
Symptom
Thermostat loses date and time after power outages
Clock Backup Failure
Symptom
Thermostat randomly reboots or restarts during normal operation
Intermittent Power or Firmware Instability
Symptom
Thermostat shows 'Waiting' or 'Delay' for several minutes before starting equipment
Compressor / System Anti-Short-Cycle Timer
Symptom
Thermostat shows incorrect indoor temperature (too high or too low compared to actual)
Temperature Calibration / Sensor Drift
Symptom
Thermostat shows indoor humidity far from actual room humidity
Humidity Sensor Miscalibration
Symptom
Thermostat shows system OFF or in standby even though mode is set to HEAT or COOL
System Lockout or Safety Shutdown
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Thermostat displays E0 and will not communicate with the HVAC system or Trane Home app
|
Communication Bus Failure | View Details |
| E1 |
Thermostat displays E1 and will not control heating or cooling
|
Indoor Unit Communication Error | View Details |
| E10 |
Thermostat displays E10 and system may not energize any outputs
|
Low Voltage Power Fault | View Details |
| E11 |
Thermostat displays E11 and certain stages of heating or cooling will not engage
|
Output Relay Failure | View Details |
| E12 |
Thermostat displays E12 and may show incorrect date/time or scheduling issues
|
Real-Time Clock / Memory Error | View Details |
| E13 |
Thermostat displays E13 and will not complete pairing with Trane Home / Nexia app
|
Cloud Connectivity / Account Binding Error | View Details |
| E2 |
Thermostat displays E2 and cooling or heating from the outdoor unit is disabled
|
Outdoor Unit Communication Error | View Details |
| E20 |
Thermostat displays E20 and dehumidification or humidification functions are disabled
|
Humidity Accessory Communication Error | View Details |
| E21 |
Thermostat displays E21 and ventilation/ERV control is not available
|
Ventilation System Communication Error | View Details |
| E3 |
Thermostat displays E3 and system may run in limited or backup mode
|
System Configuration Error | View Details |
| E30 |
Thermostat displays E30 and system operation is locked out intermittently
|
Lockout Due to Excessive Faults | View Details |
| E4 |
Thermostat displays E4 and may shut down heating or cooling
|
High Temperature Lockout / Internal Overheat | View Details |
| E40 |
Thermostat displays E40 and shows a message about incompatible equipment
|
Equipment Compatibility Error | View Details |
| E5 |
Thermostat displays E5 and may not respond to touch or commands intermittently
|
Internal Thermostat Hardware Fault | View Details |
| E50 |
Thermostat displays E50 and touchscreen is unresponsive or frozen
|
Touchscreen Interface Failure | View Details |
| E6 |
Thermostat displays E6 and outdoor temperature is not shown or is incorrect
|
Outdoor Temperature Sensor Failure | View Details |
| E60 |
Thermostat displays E60 and indicates a problem with auxiliary heat control
|
Auxiliary Heat Control Fault | View Details |
| E7 |
Thermostat displays E7 and indoor temperature reading is obviously wrong or missing
|
Indoor Temperature Sensor Failure | View Details |
| E8 |
Thermostat displays E8 and humidity readings are missing or inaccurate
|
Indoor Humidity Sensor Failure | View Details |
| E9 |
Thermostat displays E9 and will not complete Wi‑Fi setup or loses connection repeatedly
|
Wi‑Fi Module Failure | View Details |
| – |
Thermostat backlight or display flickers when HVAC equipment starts
|
Voltage Sag on Control Circuit | View Details |
| – |
Thermostat calls for cooling but outdoor unit does not start
|
Cooling Call Not Reaching Outdoor Unit | View Details |
| – |
Thermostat calls for heat but furnace or air handler does not start
|
Heating Call Not Reaching Indoor Unit | View Details |
| – |
Thermostat displays outdoor temperature as -- or blank even though a sensor is installed
|
Open Outdoor Sensor Circuit | View Details |
| – |
Thermostat displays outdoor temperature but value is obviously wrong
|
Shorted or Miscalibrated Outdoor Sensor | View Details |
| – |
Thermostat does not control whole-home dehumidifier or overcools to dehumidify
|
Dehumidification Control Misconfiguration | View Details |
| – |
Thermostat does not control whole-home humidifier even when humidity is low
|
Humidifier Control Failure | View Details |
| – |
Thermostat does not follow programmed schedule or changes modes unexpectedly
|
Scheduling / Mode Logic Error | View Details |
| – |
Thermostat does not respond to touch or buttons, but display appears normal
|
Unresponsive User Interface | View Details |
| – |
Thermostat emits a burning smell or feels unusually hot to the touch
|
Overheating Thermostat Electronics | View Details |
| – |
Thermostat fan setting ON does not run the blower continuously
|
Fan Control Output Failure or Misconfiguration | View Details |
| – |
Thermostat frequently cycles the system on and off (short cycling)
|
Improper Cycle Rate / Differential Settings | View Details |
| – |
Thermostat frequently disconnects from Wi‑Fi or Trane Home app
|
Intermittent Network Connectivity | View Details |
| – |
Thermostat has power but screen is very dim or backlight flickers
|
Insufficient Control Voltage / Backlight Power Issue | View Details |
| – |
Thermostat is completely blank and does not power on
|
No Low-Voltage Power to Thermostat | View Details |
| – |
Thermostat loses date and time after power outages
|
Clock Backup Failure | View Details |
| – |
Thermostat randomly reboots or restarts during normal operation
|
Intermittent Power or Firmware Instability | View Details |
| – |
Thermostat shows 'Waiting' or 'Delay' for several minutes before starting equipment
|
Compressor / System Anti-Short-Cycle Timer | View Details |
| – |
Thermostat shows incorrect indoor temperature (too high or too low compared to actual)
|
Temperature Calibration / Sensor Drift | View Details |
| – |
Thermostat shows indoor humidity far from actual room humidity
|
Humidity Sensor Miscalibration | View Details |
| – |
Thermostat shows system OFF or in standby even though mode is set to HEAT or COOL
|
System Lockout or Safety Shutdown | View Details |
No matching codes found
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