Carrier 42QFD048D8S Service Manual page 77

Error code
Display Error Information
EH 00/EH 0A Indoor unit EEPROM parameter error
Indoor / outdoor unit communication error
EL 01
Over low voltage protection of indoor external fan
EH 31
Over voltage protection of indoor external fan
EH 32
Over-current protection of indoor external fan
EH 33
Indoor external fan driver module protection
EH 34
Phase failure of indoor external fan
EH 35
Indoor external fan current sampling bias fault
EH 36
Zero speed failure of indoor external fan
EH 37
The indoor fan speed is operating outside of the normal range
EH 03
Outdoor temperature sensor is in open circuit or has short circuited
EC 50
Outdoor unit EEPROM parameter error
EC 51
Condenser coil temperature sensor T3 is in open circuit or has short circuited
EC 52
Outdoor room temperature sensor T4 is in open circuit or has short circuited
EC 53
Compressor discharge temperature sensor TP is in open circuit or has short circuited
EC 54
IGBT temperature sensor TH is in open circuit or has short circuited
EC 55
Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited(for free-match
EC 56
outdoor units)
Open circuit or short circuit of outdoor temperature sensor or outdoor unit EEPROM parameter error
EC 05
Outdoor unit malfunction
EC 0
Indoor room temperature sensor T1 is in open circuit or has short circuited
EH 60
Evaporator coil middle temperature sensor T2 is in open circuit or has short circuited
EH 61
Over-current protection of outndoor external fan
EC 71
Outdoor external fan driver module protection
EC 75
Phase failure of outdoor external fan
EC 72
Outdoor external fan current sampling bias fault
EC 74
Zero speed failure of outdoor external fan
EC 73
The outdoor fan speed is operating outside of the normal range(
EC 07
Indoor PCB/Display board communication error
EH 0
Refrigerant leakage detection
EL 0C
Rf module failure
eh 0h
Indoor display board EEPROM parameter error
EH OL
Indoor and outdoor mismatch malfunction
FL 09
IPM malfunction or IGBT over-strong current protection
PC 00
Over low voltage protection
PC 10
Over voltage protection
PC 11
 Troubleshooting 9 