27
Troubleshooting
Indoor Unit Error Codes
Table 9. Indoor Unit Troubleshooting Codes
Display
E0 Indoor unit EEPROM error
E1 Communication error between indoor and outdoor units
E3 Indoor fan speed error
E4 Indoor return air temperature sensor error
E5 Indoor coil temperature sensor error
EC Low refrigerant
EE High water level alarm (for ducted units only)
F0 Outdoor current overload sensed
F1
Outdoor ambient temperature sensor error (T4
malfunction)
F2 Outdoor coil temperature sensor error (T3) Malfunction
F3
Compressor discharge temperature sensor error (T5)
Malfunction
F4 Outdoor unit EEPROM error
F5 Outdoor unit fan speed error
F6 Indoor coil outlet temperature sensor error (T2B)
P0 Inverter module IPM error
P1 High or low voltage protection
P2 High temperature sensed at compressor top
P3 Outdoor low ambient temperature protection
P4 Compressor drive error
P6 High or low pressure switch open
P7 Outdoor IGBT temperature sensor error
Outdoor Unit Error Codes
The error code display is located on the main controller
board of the MPC036, MPC048, MLB036 and MLB048
models only.
Table 10. MLB and MPC Single-Zone Outdoor Unit
Error Codes
Display
EL01
Communication malfunction between indoor and
outdoor units.
FL14
Capability mismatch between indoor unit and outdoor
unit
EC50 Outdoor temperature sensor error.
EC51 Outdoor EEPROM error.
EC52 Condenser coil temperature sensor (T3) malfunction.
EC53 Outdoor ambient temperature sensor (T4 ) malfunction.
EC54
Compressor discharge temperature sensor TP is in
open circuit or has short circuited
EC55 Outdoor IPM module temperature sensor malfunction
Table 10. MLB and MPC Single-Zone Outdoor Unit
Error Codes
Display
EC56 Outdoor T2B sensor error.
EC57 Refrigerant pipe temperature sensor error.
EC07
Outdoor DC fan motor malfunction/fan speed out of
control.
EC71 Over current failure of outdoor DC fan motor.
EC72 Lack phase failure of outdoor DC fan motor.
PC00 Inverter module (IPM) protection.
PC02 Top temperature protection of compressor.
PC06 Discharge temperature protection of compressor.
PC08 Outdoor over-current protection.
PC0A High temperature protection of condenser.
PC0F PFC module protection.
PC0L Low temperature protection of outdoor unit.
PC10 Outdoor unit low AC voltage protection.
PC11
Outdoor unit main control board DC bus high voltage
protection.
PC12
Outdoor unit main control board DC bus high voltage
protection / 341 Machine Check Error (MCE) error.
PC30 System high pressure protection
PC31 System low pressure protection
PC40
Communication error between outdoor main chip and
compressor driven chip
PC42 Compressor start failure of outdoor unit
PC43 Outdoor compressor lack phase protection
PC44 Outdoor unit zero speed protection
PC45 Outdoor unit IR chip drive failure
PC46 Compressor speed has been out of control
PC49 Compressor over-current failure
PCA1 Condensation protection of refrigerant pipe
To Next Page
Loading...
Need help?
General