Model reference

Haier HSU12HZ03

Air Conditioner

1 document18 error codes3 service modes

Available documentation

Service Manual

Domestic Air Conditioner SERVICE MANUAL61 pg
Covers this model

MyPros+ Max

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Step-by-step diagnostics from the service manual
Test values, resistance specs, and wiring references
Verified part numbers when replacement is needed

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M+

M+ Max·Haier Air Conditioner

Power■ Timer■ Running★ on my Haier HSU12HZ03

M+

Transmission abnormity — outdoor unit

From Service Manual 201033, p.45:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure door lock assembly resistance across PTC terminals. Expected: ~200 ohms cold.

3.Inspect strike and latch alignment. A misaligned strike prevents the switch stack from closing.

Part WH44X10288

Door lock assembly

Error codes (18)

CodeMeaning

Power■ Timer■ Running★Transmission abnormity Power■ Timer★ Running■Overhigh discharging temperature protection Power■ Timer★ Running□Insufficient current protection (low-voltage protection).Power■ Timer★ Running★Outdoor control board temperature protection Power□ Timer■ Running★Abnormity of control board thermistor.Power□ Timer□ Running★Abnormity of defrosting thermistor.Power□ Timer★ Running■Abnormity of outdoor thermistor.Power□ Timer★ Running□Abnormity of module thermistor.Power□ Timer★ Running★Module temperature rising protection.Power★ Timer■ Running■Abnormity of indoor thermistor Power★ Timer■ Running□Compressor running abnormity.Power★ Timer■ Running★CT wiring disconnected protection.Power★ Timer□ Running■Abnormity of discharging thermistor.Power★ Timer□ Running□Abnormity of thermal conversion thermistor (indoor coil pipe temperature sensor…Power★ Timer□ Running★EEPROM abnormity Power★ Timer★ Running■AC current protection.Power★ Timer★ Running□DC current protection Power★ Timer★ Running★High-load protection

Service modes (3)

Abnormity Diagnose (Error Code Recall)Press the emergency switch and hold for 10-15 seconds until the buzzer sounds three times.
Automatic Emergency RunningPress the emergency button for 0-5 seconds.
Trial Running (Test Mode)Press the emergency button and hold for 5-10 seconds until the buzzer sounds twice.

Full entry steps, exit procedures, and test sequences are available in Max.

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