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Trane Air Conditioner Error Codes

Error codes

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Air conditioner manufacturers often include error codes in their manual for user reference. If you no longer have the manual for your unit, check our list below for the list of Trane error codes by unit model.

Trane Air Conditioner Error Codes

Standard Air Conditioner Error Code List

Code Description
E1 Indoor and Outdoor Unit Communication Error
E2 Room Temperature Sensor Malfunction
E3 Pipe Temperature Sensor Malfunction
E4 Outdoor Temperature Sensor Malfunction
E5 Pump Temperature Sensor Malfunction
E6 Outdoor Unit Malfunction
E7 Electrical Erasable Read-Only Memory (EEPROM) Test Fail
E8 Water-level Alarm Error
EC Refrigerant Leakage Detected
EB Motor Speed Out of Control
ED Outdoor Unit has Low Pressure Error

Inverter Air Conditioner Error Code List

Code Description
E1 Indoor and Outdoor Unit Communication Fault Code
E2 Room Temperature Sensor Error
E3 T2 Temperature Sensor Error
E4 T2B Temperature Sensor Error
E7 Electrical Erasable Read-Only Memory (EEPROM) Test Fail
E8 Fan Motor Speed Out of Control
EE Water-level Alarm Malfunction
ED Outdoor Unit Malfunction
EC Refrigerant Leakage Detected
F3 Indoor Twin Rotary Compressor Communication Error
F4 Issues with Twin Rotary Compressor

LED Blinking Error Codes

Code Description
2 Flashes System Lockout Initiated (lockout can take up to 1 hour)
3 Flashes Pressure Switch Failure
4 Flashes TCO Circuit is Open
5 Flashes Flame/Overheating Detected without Gas Valve Open
6 Flashes Flame Rollout Switch is Open
7 Flashes W1 Wire and/or W2 Wire Swapped

LED Color Codes

Code Description
Green Light; Fast Flicker Normal Operation; No Issues Detected
Yellow Light; Flickers Every 2 Seconds No Communication to Other Modules
No LED Light Power Off/Board Failure

Trane Split System Error Codes

Code Description
C5 Preventive System for Jump Wire Cap Malfunction
E1 High-pressure Protection System/PCB Malfunction
E2 Anti-freezing Preventive
E4 Compressor Exhaust Protection from High Temperature
E5 Alternate Current (AC) Overload Protection
E6 Indoor and Outdoor Unit Communication Error
E8 Unit Protection from High Temperature
EU Intelligent Power Module (IPM) Temperature Overload
F1 Ambient Sensor Open/Short circuited (Indoor Unit)
F2 Evaporator Sensor Open/Short circuited (Indoor Unit)
F3 Ambient Sensor Open/Short circuited (Outdoor Unit)
F4 Condenser Sensor Open/Short circuited (Outdoor Unit)
F5 Air Exhaust Sensor Open/Short circuited (Outdoor Unit)
F6 Overload at Limit
F8 Overcurrent Requires Descending Frequency
F9 Air Exhaust Requires Descending Frequency
FH Anti-freezing System at Limit
H6 No Feedback from Indoor Motor
PH DC Voltage Generator
PL Low Direct Current (DC) Bus Voltage Preventive System
U3 Direct Current (DC) Bus Voltage Dips
U7 Four-way Valve Malfunction
U9 Zero-cross Detection for Outdoor Units

Wired Controller Error Codes

Code Description
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
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