An error code is a way for an HVAC system (like a mini-split or central unit) to communicate that something isn’t working properly.
Instead of just shutting down with no explanation, the system will flash a specific code — usually letters and numbers — on a display or indicator light.
Each error code points to a specific issue, like:
Electrical problems
Sensor malfunctions
Communication failures between components
Refrigerant pressure issues
Motor faults
Temperature problems
Code | Issue |
|---|---|
FC | Forced Cooling (Not an error code) |
EC-07 | ODU fan speed out of control |
EC-51 | ODU EEPROM parameter error |
EC-52 | ODU coil temp. sensor (T3) error |
EC-53 | ODU ambient temp. sensor (T4) error |
EC-54 | COMP. discharge temp. sensor (TP) error |
EC-56 | IDU coil outlet temp. sensor (T2B) error (Multi-zone) |
EC-C1 | Other IDU refrigerant sensor detects leakage (Multi-zone) |
EH-00 | IDU EEPROM malfunction |
EH-03 | IDU fan speed out of control |
EH-0A | IDU EEPROM parameter error |
EH-0E | Water-level alarm malfunction |
EH-12 | Main unit or secondary unit malfunction |
EH-3A | External fan DC bus voltage is too low protection |
EH-3b | External fan DC bus voltage is too high fault |
EH-60 | IDU room temp. sensor (T1) error |
EH-61 | IDU evaporator coil temp. sensor (T2) error |
EH-bA | Communication error between the indoor unit and the external fan module |
EH-C1 | Refrigerant sensor detects leakage |
EH-C2 | Refrigerant sensor is out of range and leakage is detected |
EH-C3 | Refrigerant sensor is out of range |
EL-01 | IDU & ODU communication error |
EL-0C | System lacks refrigerant |
EL-11 | Communication malfunction between main unit and secondary units |
FH-07 | Communication malfunction between indoor unit and auto-lifting panel |
FH-CC | Refrigerant sensor error |
PC-00 | ODU IPM module protection |
PC-01 | ODU Voltage Protection |
PC-02 | Compressor top (or IPM) temp. protection |
PC-03 | Pressure protection (low or high pressure) (for some models) |
PC-04 | Inverter compressor drive error |
PC-0L | Low ambient temperature protection (for some models) |
| - - | IDUs Mode Conflict (Multi-Zone) |
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