Haier Air Conditioner Error Code F2

The F2 error code on a Haier air conditioner indicates a compressor overcurrent condition detected by the IPM (Intelligent Power Module). The IPM is a combined power semiconductor module that drives and protects the compressor motor. When current flowing through the compressor circuit exceeds the module's rated threshold, the IPM triggers this fault to prevent damage to the compressor windings and power electronics. The unit will shut down and lock out until the underlying cause is addressed.

There are three primary categories of failure that trigger F2. First, the IPM module itself may be internally damaged, causing it to misread current or fail to properly regulate the compressor drive signal. Second, the compressor may have developed a winding fault or mechanical seizure, drawing excessive current as it struggles to operate. Third, supply voltage that is too low or too high can push current draw outside normal operating parameters, triggering the overcurrent fault even with otherwise healthy components.

The key diagnostic split is whether the fault appears before or after the compressor attempts to start. If F2 is logged immediately upon powering the unit, before the compressor receives a start command, the IPM module is the most likely culprit and should be replaced. If the fault occurs during or after a startup attempt, the focus shifts to verifying supply voltage is within spec and checking refrigerant system pressure, since an overcharged or undercharged system can cause the compressor to overload and exceed current limits.