Alliance error code E4
What it means
Compressor or discharge temperature error.
Possible causes
Discharge line overheating from high condensing pressure Poor outdoor airflow Refrigerant charge issues
Suggested fix
Inspect outdoor coil and fan performance, verify pressures and discharge temperature and check charge; resolve airflow or charge problems and then reset the error and monitor compressor behaviour.
Safety first. Isolate the power supply before inspecting any unit. Refrigerant-circuit
and electrical repairs must be carried out by a qualified, registered technician.
Other Alliance codes
- E1 — Communication error between indoor and outdoor units (Midea-platform logic).
- E2 — Indoor temperature or evaporator sensor error.
- E3 — Refrigerant leak or low capacity protection.
- E5 — Fan motor fault.
- EC — Refrigerant leakage alarm.
- F0 — Low refrigerant protection.
- F1 — Indoor ambient temperature sensor fault.
- F2 — Indoor evaporator temperature sensor fault.
- F3 — Outdoor ambient temperature sensor fault.