Fault Codes / Haier

37 codes

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• E2 — E2 = heat-exchanger (indoor coil) temperature sensor failure (open/short circuit) — not a specific icing/anti-freeze protection code per Haier's service manual.
• F22 — AC overvoltage protection (outdoor)

MRV 5

• E0 — Condensate drain violation / clogged.
• E1 — Room temperature sensor fault.
• E12 — Outdoor EEPROM error.
• E14 — Indoor fan motor malfunction.
• E20 — 4-way reversing valve switching failure.
• E3 — Low pressure protection.
• E4 — Indoor EEPROM error.
• E5 — Compressor overload protection.
• E7 — Communication error.
• E9 — Work-intense / overload protection.
• F1 — IPM (Intelligent Power Module) protection.
• F11 — Compressor deviation / breaker trip.
• F13 — Low refrigerant level.
• F19 — Voltage fluctuation (too high/low).
• F2 — Compressor overcurrent.
• F21 — Defrost temperature sensor fault.
• F23 — Single phase overcurrent.
• F25 — Discharge temperature sensor fault.
• F27 — Compressor locked rotor.
• F28 — Station detect loop error (wiring).
• F3 — IPM & main PCB communication error.
• F4 — Discharge temperature overheat.
• F6 — Ambient temperature sensor fault.
• F7 — Suction temperature sensor fault.
• F8 — DC fan motor (outdoor) fault.

MRV5 IIS (Digitalanzeige-Code)

• 28-30 — Number of connected indoor units detected as less than the set number, for 300 seconds.
• 39-1 — Compression ratio too high (>12.0) for 5 consecutive minutes — protection.
• 3A — Sub-cooling temperature sensor (Tsco) failure — open or short circuit.
• 43 — Discharge superheat (TdSH) too low protection for 5 consecutive minutes.
• 51-0 — Electronic expansion valve A (LEVa) over current — driver chip detection.
• 51-2 — Electronic expansion valve B (LEVb) over current — driver chip detection.
• 52-0 — Electronic expansion valve A (LEVa) circuit open failure — driver chip detection.
• 52-2 — Electronic expansion valve B (LEVb) circuit open failure — driver chip detection.
• 64 — CT current too low or current sensor failure at the compressor.
• HPS — High pressure switch (HPS) failure — locked permanently if it occurs 3 times in one hour.