Troubleshooting your Trane air conditioner will require you to understand the underlying problem within your unit. More often than not, your Trane AC flashes an error code on its LED screen or remote control when the unit detects an internal problem. Decoding the meaning behind these error codes will help with the troubleshooting process.
In this article, we present the full list of error codes for your Trane air conditioner. Your air conditioning unit may have issues with a clogged filter, faulty pressure switch, or thermostat miscommunication. Always refer to your user's manual for troubleshooting steps, or check out our guide on troubleshooting and restarting your Trane air conditioner.
Trane Error Codes
Common Fault Codes and Actions Taken
| Fault Codes | Meaning | Action |
|---|---|---|
| 0x01 | EEPROM communication error contact service technician. Unit stops working. | Action to be taken by user: Contact service technician. |
| 0x02 | Compressor failure or refrigerant leakage. Unit stops working. | Action to be taken by user: Contact service technician. |
| 0x03 | Filter choke error -Clean the air filter. Unit operates as per user settings. | Action to be taken by user: Clean filters. |
| 0x04 | Indoor Temp Sensor Error (Room). Thermostat Room Sensor Failure. | Cool Mode Or Dry Mode: Unit Operate With Compressor Off Fan Mode: Operates As Per User Setting. |
| 0x05 | Outdoor Temp Sensor Error. Outdoor Thermostat Sensor Failure. | Operates Indoor Unit And Outdoor Unit As Per User Setting. If Trane Mode Is Activated Unit Should Operate At Set Point 24 °C. |
| 0x06 | Indoor Coil Sensor Error. Indoor Thermostat Sensor Failure. | Cool Mode Or Dry Mode: Unit Operates With Compressor Off Fan Mode: Operates As Per User Setting. |
| 0x08 | Communication Error between the Indoor Unit and Outdoor Unit | Stop Indoor Unit And Outdoor Unit. |
| 0x09 | Thermostat/Remote Control Low battery. Operates indoor unit and outdoor unit as per user setting. | Change battery. |
| 0x0A | Input Power Error. Error 10 Idu Error - Input Power Problem. Unit Stops Working. | Check The Power Cord / Contact Service Technician |
| 0x0B | Fan Failure Error. IDU Error - Fan Failure. Unit Stops Working. | Inspect and replace any faulty components. |
Trane Split-system Error Codes
No LED light on outdoor PCB
| Fault Codes | Meaning |
|---|---|
| E1 | Indoor PCB malfunction |
| E2 | Anti-freezing protection |
| E5 | Overcurrent protection |
| EE | Storage slug |
| F1 | Internal ambient temperature sensor malfunction |
| F2 | Indoor pipe temperature sensor malfunction |
| H3 | Overload of compressor |
| H4 | Overload system |
| H6 | No motor of indoor unit feedback |
| Lc | Startup failure |
| U1 | Phase current detection malfunction of compressor |
| U7 | 4-way valve conversion abnormal |
| UF | Zero passage abnormal |
| UH | No motor of outdoor unit feedback |
LED light on outdoor PCB
| Fault Codes | Meaning |
|---|---|
| C5 | Jump wire cap malfunction protection |
| E1 | System high pressure protection |
| E2 | Anti-freezing protection |
| E4 | Compressor air exhaust high temp. protection |
| E5 | AC overload protection |
| E6 | Indoor and outdoor units communication malfunction |
| E8 | Anti-high temp. protection |
| EU | IPM temp. is too high limit/decrease frequency |
| F1 | Indoor ambient sensor open circuit, short circuit |
| F2 | Indoor evaporator sensor circuit open, short circuit |
| F3 | Outdoor ambient sensor circuit open, circuit short |
| F4 | Outdoor condenser sensor open circuit, short circuit |
| F5 | Outdoor air exhaust sensor open circuit, short circuit |
| F6 | Overload limit/descending frequency |
| F8 | Overcurrent need frequency descending |
| F9 | Air exhaust over high need frequency descending |
| FH | Anti-freezing limit/decrease frequency |
| H6 | Indoor unit motor no feedback |
| PH | DC generatrix voltage |
| PL | Low DC Bus voltage protection |
| U3 | DC Bus voltage dips |
| U7 | Four-way valve abnormal |
| U9 | Outdoor unit zero-cross detection error |
Multi-Split Wired Controller
| Error Code | Meaning |
|---|---|
| B5 | Liquid Valve Temperature Sensor Open/Short circuited (Indoor Unit) |
| B7 | Gas Valve Temperature Sensor Open/Short circuited (Indoor Unit) |
| DN | Communication Line Disconnected/Expansion Valve Malfunction |
| E1 | High Pressure Prevention System |
| E2 | Anti-freezing Prevention System |
| E3 | Low Pressure Prevention System |
| E4 | Discharge High Temperature Prevention System |
| E5 | Overcurrent Prevention System; Frequency Decreased |
| E6 | Indoor and Outdoor Unit Communication Error |
| E7 | Running Mode Issue |
| E8 | Overload Prevention System; Frequency Decreased |
| E9 | Water Overflow Error (Indoor Unit) |
| EN | Intelligent Power Module (IPM) Current Prevention System |
| EU | Intelligent Power Module (IPM) Temperature Prevention System |
| F1 | Room Air Temperature Sensor Open/Short circuited |
| F2 | Evaporator Temperature Sensor Open/Short circuited |
| F3 | Ambient Temperature Sensor Open/Short circuited (Outdoor Unit) |
| F4 | Condenser Temperature Sensor Open/Short circuited (Outdoor Unit) |
| F5 | Discharge Temperature Sensor Open/Short circuited |
| F6 | Overload Protection; Frequency Restricted |
| F8 | Current Protection; Frequency Restricted |
| FO | System Charge Shortage/Blockage Prevention/Pump Down |
| F9 | High Discharge Temperature; Frequency Restricted |
| FH | Anti-freezing; Frequency Restricted |
| H1 | Defrosting |
| H3 | Compressor Overheating Preventive |
| H7 | Compressor Desynchronizing |
| H5 | Intelligent Power Module (IPM) Current Protection |
| H6 | Stalled Motor |
| HE | Compressor Demagnetization Protection |
| HC | Power Factor Correction (PFC) |
| L3 | Outdoor Fan1 Error |
| L9 | Overpower Protection |
| LA | Outdoor Fan2 Error |
| LC | Compressor Startup Failure |
| LD | Compressor Phase Loss/Reversal |
| LE | Stalling Compressor |
| LF | Speeding |
| LP | Indoor and Outdoor Units Unmatched |
| P6 | Drive Board Communication Error Codes |
| P9 | Alternate Current (AC) Contactor Error Code |
| PD | Sensor Connection Error Code |
| PE | Temperature Drift Error Code |
| PF | Drive Board Temperature Sensor Error Code |
| PU | Capacitor Charging Error Code |
| P5 | Over Phase Current |
| P7 | Intelligent Power Module (IPM) Temperature Tensor Open/Short Circuited |
| P8 | Intelligent Power Module (IPM) Temperature Protection |
| PH | Direct Current (DC) Bus Over-Voltage |
| PL | Direct Current (DC) Bus Under-Voltage |
| PP | Alternate Current (AC) Input Voltage Error Code |
| U1 | Compressor Phase Current Circuit Error Code |
| U3 | Sensor Connection Error Code |
| U5 | Current Circuit Error Code |
| U7 | 4-Way Valve Reversing Error Code |
| U8 | PG Motor Zero-Crossing Protection |
2-Trane Mini TVR 5G Error Codes
Normal LED Displays:
- On Standby: LED screen displays the amount of indoor units communicating with outdoor units.
- On Operation: LED screen displays the frequency value of the compressor.
- On Defrost Setting: LED screen displays dF for defrosting.
Indoor Unit
| Fault Codes | Meaning |
|---|---|
| H0 | Malfunction or Protection: M_Home unmatching |
| E0 | Malfunction or Protection: EEPROM Fault |
| E2 | Malfunction or Protection: Communication fault of the outdoor chip and the indoor chip |
| E3 | Malfunction or Protection: Main board and IR341 not properly connected |
| E4 | Malfunction or Protection: Outdoor unit sensor fault |
| E5 | Malfunction or Protection: Voltage protection fault from circuit breaker |
| E6 | Malfunction or Protection: Direct-current fan fault |
| E7 | Malfunction or Protection: Heating fan fault in the area A lasts for 5 minutes |
| E8 | Malfunction or Protection: There are two times E6 fault in 10 minutes (recovery will be after power off) |
| P0 | Malfunction or Protection: The cooling fin high temperature protection |
| P1 | Malfunction or Protection: High pressure protection |
| P2 | Malfunction or Protection: Low pressure protection |
| P3 | Malfunction or Protection: Compressor current protection |
| P4 | Malfunction or Protection: Discharge temperature protection |
| P5 | Malfunction or Protection: Outdoor condenser high temperature protection |
| P6 | Malfunction or Protection: IPM modules protection |
| P7 | Malfunction or Protection: Evaporator high temperature protection |
| P8 | Malfunction or Protection: Typhoon protection |
Outdoor Unit
| Fault Codes | Meaning |
|---|---|
| E2 | Malfunction or Protection: Communication malfunction between indoor/outdoor units |
| E4 | Malfunction or Protection: T3 and T4 temperature sensor malfunction |
| E5 | Malfunction or Protection: Power voltage protection |
| E6 | Malfunction or Protection: Fan Protection |
| E7 | Malfunction or Protection: Compressor discharge temperature sensor malfunction |
| E9 | Malfunction or Protection: EEPROM malfunction |
| EA | Malfunction or Protection: A fan in the Aregion run for more than 5 minutes in Heat mode |
| Eb | Malfunction or Protection: 2 times of E6 protection in 10 minutes |
| H0 | Malfunction or Protection: Communication malfunction between IR341/main board |
| P1 | Malfunction or Protection: Hi-pressure protection |
| P2 | Malfunction or Protection: Low-pressure protection |
| P3 | Malfunction or Protection: Input current protection |
| P4 | Malfunction or Protection: Compressor discharge protection temperature |
| P5 | Malfunction or Protection: Condenser high temperature protection |
| P6 | Malfunction or Protection: Inverter module protection |
| P8 | Malfunction or Protection: Typhoon protection |
| PE | Malfunction or Protection: Indoor evaporator hi-temp protection |
Check out our article on Trane aircon troubleshooting.
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