HVAC Toolkit
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Trane Error Codes

Inverter Mini-Splits & Air Conditioners ยท USA

Prefixes: E=System/Sensor, F=Sensor/Protection, P=Protection, H=Status

E-Series (System/Sensor Errors)

Code Description Possible Cause Action
E0 EEPROM parameter error Unit EEPROM data corrupted Reset power; replace PCB if persists
E1 Indoor/outdoor communication error Communication line disconnected Check signal wiring between units
E2 Zero crossing detection error Power supply frequency abnormal Check power supply quality
E3 Fan speed out of control Indoor fan motor abnormal Check fan motor, capacitor, driver
E4 Room temperature sensor fault T1 thermistor open or short Check and replace room sensor
E5 Evaporator coil sensor fault T2 thermistor open or short Check and replace coil sensor
E6 Condenser coil sensor fault Outdoor coil thermistor fault Check outdoor coil temperature sensor
E109 Communication timeout during startup Indoor-outdoor communication failed at startup Verify all wiring and power connections
E201 Indoor/outdoor tracking communication error Indoor unit powered off or wire break Check indoor power and daisy-chain wiring
E320 OLP sensor open or short Compressor top sensor or circuit board defective Check OLP sensor, replace PCB if needed

F-Series (Sensor/Protection Codes)

Code Description Possible Cause Action
F1 Outdoor ambient sensor fault Outdoor temperature sensor failure Check outdoor ambient thermistor
F2 Condenser temperature sensor fault Condenser coil thermistor failure Check condenser sensor resistance
F3 Discharge temperature sensor fault Compressor discharge thermistor failure Check discharge temperature sensor

H-Series (Status/Protection)

Code Description Possible Cause Action
H1 Defrost mode Normal defrost operation Normal, wait 5-10 minutes to complete
H3 Compressor overload protection Overcurrent or overheating Check compressor and refrigerant charge

P-Series (Protection Codes)

Code Description Possible Cause Action
P0 IPM module protection Inverter module fault Check IPM module and compressor
P1 Over/under voltage protection Supply voltage out of range Check power supply voltage at unit
P2 Compressor top temperature high Compressor discharge overheating Check superheat, charge, clean condenser
P4 Inverter compressor drive error Drive board failure Check inverter drive board
P5 DC fan motor fault Outdoor fan motor feedback error Check DC fan motor wiring and bearings

Trane Troubleshooting Tips

Before Calling for Service

  • Turn off unit, wait 5 minutes, then restart - some errors auto-reset
  • Check and clean air filters - many errors caused by restricted airflow
  • Verify power supply voltage is within specification
  • Check circuit breaker and disconnect switch
  • Note the exact error code and when it occurs for technician

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