Bosch Heat Pump: M15, M18, M20
Re: Fault Codes / Status Codes
Fault Code Display | |||
Fault Code | Fault Description | ||
C3 | The coil sensor (T3) is seated fault in Cooling | ||
E4 | Temperature Sensor Fault (T3, T4, T3L, T5 or TF) | ||
E5 | High or Low Voltage Protection | ||
E6 | Outdoor Fan Motor Fault | ||
E7 | Compressor Discharge Sensor (T5) is seated fault | ||
E9 | EEPROM Fault | ||
H0 | Communication Fault in main control chip | ||
H5 | 5 times (P2 Fault) in 100 minutes (Hard Lockout) | ||
H8 | Pressure Transducer Fault (PT) | ||
P0 | Control Board temperature protection (TF) | ||
P1 | High Pressure Switch protection (HPS) | ||
P2 | Low Pressure protection in heating or cooling (PT) | ||
P3 | Compressor Overcurrent protection | ||
P4 | High Compressor Discharge temperature protection (T5) | ||
P5 | Condenser Coil temperature protection in Cooling (T3) | ||
P8 | Outdoor Fan Motor hurricane/typhoon protection | ||
PH | Low discharge superheat protection | ||
F1 | High Pressure Switch (HPS) fault | ||
L0-L9 | IPM Fault | ||
AtL | Ambient Temperature limited |
System Protection Status Codes | |||
Display | Description | ||
L | Outdoor Coil (T3) limited condition | ||
D | Compressor Discharge (T5) limited condition | ||
P | Compressor ratio limited condition | ||
F | T5 limited condition | ||
C | Current limited condition | ||
U | Under low voltage limited condition | ||
A | Oil return mode | ||
dF | Defrost mode |