Whirlpool Washer Error Code 331

Error code 331 means the compressor motor inverter board has reported a fault. This board controls the compressor motor used during drying cycles. The code indicates the inverter board detected an issue, which could stem from incorrect supply voltage, wiring problems, or a board failure. The first diagnostic step is to check for 102VAC to 132VAC at connector CN8 on the inverter board.

You should not continue using the washer's drying function while error code 331 is active, as the compressor motor is not operating correctly. The washing function may still be available depending on the model, but running the appliance with a known inverter fault risks further damage to the inverter board or compressor motor. Address the fault before resuming normal use.

A reset may temporarily clear the error code, but if the underlying fault condition still exists, the code will return once the compressor motor inverter is activated again. A reset does not fix the root cause, whether that is low supply voltage, a bad wiring connection, or a failed board. Proper diagnosis is required to resolve the fault permanently.

Some causes of error code 331 can be addressed without replacing parts, such as tightening loose wiring connections at the CN8 connector or resolving a low-voltage issue at the household circuit. However, diagnosing the inverter board and measuring AC voltage at specific connector pins requires a multimeter and comfort working with live electrical components. If you are not experienced with appliance electrical diagnostics, it is safer to call a qualified technician.

Repair costs vary depending on the root cause. If only wiring connections need to be cleaned or reseated, costs are minimal. Replacing the compressor motor inverter board typically ranges from $150 to $400 including parts and labor. Replacing the compressor motor itself is more expensive, often ranging from $300 to $600 or more depending on the model and labor rates in your area.