Error Code Table
ESP Unit Error Fault Codes
Outdoor CPU: Wall Controller: Fault/Function
0: Cooling Mode
1: Heating Mode
2: Heating compressor run time >20mins
3: Heating Defrost
4: LOW speed flashes every 30s: Over Heat or Anti-Freeze Protection mode (Reduced Capacity Mode)
5: Heating mode – indoor coil pre-heat
E6: Fault discharge temperature
E7: Fault outdoor coil sensor (open or closed circuit)
E8: Fault outdoor discharge sensor (open or closed circuit)
E9*: High or Low Pressure/Phase error (3 phase models only)*
E2: Fault indoor coil out sensor
E3: Fault room sensor(s) (open or closed circuit)
E4: Fault indoor coil sensor (open or closed circuit)
E5: Communication Fault
*E9 can also indicate a phase error (incorrect phase rotation or phase loss).
M Series (AM24 and AM7) Controller
OUTDOOR CPU: AM24 Wall Control: AM7 Wall Control: Fault/Function
0: Cooling Mode
1: Heating Mode
2: Heating Mode after 20 minutes of compressor run time. Defrost Standby.
3: Heating Mode De-ice cycle
5: Heating Mode Indoor coil pre-heat after defrost
E7: Fault: Outdoor coil sensor (open circuit)
E7: Fault: Outdoor coil sensor (closed circuit)
E9: Fault: High or Low pressure tripped (Note: Some models have discharge sensor, which will also give the same fault code.)
E5: Communication error between outdoor and indoor.
C Series (C7-1) Controller
OUTDOOR CPU: C7 Wall Control: Fault/Function
0: Cooling Mode
1: Heating Mode
2: Heating Mode after 20 minutes of compressor run time. Defrost Standby.
3: Heating Mode De-ice cycle
5: Heating Mode Indoor coil pre-heat after defrost
E5: Communication error between outdoor and indoor.
E7: Fault: Outdoor coil sensor open circuit
E7: Fault: Outdoor coil sensor short circuit
E9: Fault: High or Low pressure tripped (Note: Some models have discharge sensor, which will also give the same fault code.)
D Series 24 Hour (AECSN) and 7 Day (AEC7N) Controller
OUTDOOR CPU: Fault/Function
0: Cooling Mode
1: Heating Mode
2: Heating Mode after 20 minutes of compressor run time. Defrost Standby.
3: Heating Mode De-ice cycle
5: Heating Mode Indoor coil pre-heat after defrost
E5: Communication error between outdoor and indoor.
7: E1: Fault: Outdoor coil sensor open circuit
8: E1: Fault: Outdoor coil sensor closed circuit
9: (heat/cool flash): E2: Fault: High or Low pressure tripped (Note: Some models have discharge sensor, which will also give the same fault code.)
Notes:
- Faults may not be displayed on the wall control until the fault occurs several times.
- Phase error will be indicated by a red light on the 3-phase relay.
- Phase correction must be applied to the incoming supply side.