Haier Heat Pump Error Code 4 flashes

The 4-flash code on a Haier heat pump indicates an over current protection fault. It activates when the compressor's running current exceeds the programmed protection value continuously for 20 seconds, and this condition has occurred 3 times within 30 minutes. The system shuts down to prevent damage to the compressor and its electrical components.

It is not advisable to continue operating the unit while this fault is active. The overcurrent condition indicates the compressor is under abnormal electrical or mechanical stress. Continuing to run the unit without addressing the cause risks permanent compressor damage, which is the most expensive component in the system to replace.

The first step is to reset power and verify that dip switches SW1-3 and SW1-4 on the control board are configured correctly for the specific unit model, since an incorrect setting can cause false overcurrent trips. After confirming the configuration, the technician should check system refrigerant pressures, inspect compressor wiring and terminal connections, test the run capacitor, and listen and monitor for signs of mechanical compressor stress such as elevated current draw or unusual noise during startup.

A power reset will clear the alarm display, but it will not resolve the underlying cause. If the compressor continues to draw excessive current, the fault will return and trigger again. Repeated cycling through this fault without a repair can accelerate compressor wear, so the root cause should be identified and corrected before returning the unit to regular operation.

Repair costs vary widely depending on the root cause. Correcting dip switch settings or tightening wiring connections may cost only a standard service call fee, typically in the range of $75 to $150. Replacing a run capacitor generally falls in the $100 to $250 range. Compressor replacement is significantly more expensive, often ranging from $800 to $2,000 or more depending on the unit size and labor rates in your area.