Haier Air Conditioner Error Code F28

F28 indicates a loop detection error on the inverter side, meaning the system has detected abnormal current in the compressor drive circuit. The inverter board monitors the current flowing to the compressor during startup, and when the reading is outside expected parameters, it shuts down and displays F28. This is a protective fault designed to prevent damage to the inverter components and compressor.

The unit will not operate normally with F28 active because the system has already shut down compressor operation as a protective measure. Attempting to force operation is not recommended, as an underlying current abnormality in the inverter circuit can cause further damage to the drive board or compressor if left unresolved.

Repair costs vary depending on the root cause. Fixing a loose wiring connection is relatively inexpensive, typically covering only a service call fee in the range of $75 to $150. Inverter board replacement can range from $200 to $500 or more depending on the model, while compressor replacement is the most costly repair, often ranging from $400 to $900 or higher including labor.

A basic first step any homeowner can safely perform is a visual check of the wiring connections at the compressor terminals after disconnecting power. However, diagnosing faults in the inverter board or testing compressor winding resistance requires a multimeter and familiarity with electrical components. Inverter board replacement and refrigerant-related compressor issues require a qualified technician.

A power reset may temporarily clear the fault display, but F28 will return if the underlying cause has not been corrected. If the error reappears within the first three minutes of startup, the wiring, compressor, or inverter board needs proper diagnosis before the unit will operate reliably.