Whirlpool Washer Error Code 340

Error code 340 on a Whirlpool washer indicates a Compressor Motor Inverter Fault. The inverter board that controls the compressor or blower motor has reported an internal fault, causing the washer to stop operation. This can result from improper line voltage, a failing inverter board, a faulty motor, or wiring issues at the board connector.

No, you should not continue operating the washer when error code 340 is active. The machine stops as a protective measure, and forcing it to run could cause further damage to the inverter board, the motor, or related components. Discontinue use and perform diagnostic checks before attempting to run the washer again.

Resetting the washer may temporarily clear the code, but if the underlying fault condition is still present, the error will return once the machine attempts to run again. A reset is not a fix for this error. The inverter board fault requires proper diagnosis of line voltage, motor condition, and wiring before the code will stay clear permanently.

Some causes of error 340 can be addressed without professional help, such as checking that your home's electrical supply is within range or inspecting the wiring connector at CN8 for loose or corroded pins. However, testing motor windings and replacing the inverter board involves working with AC voltage and specialized components, which is best handled by a qualified technician. If you are comfortable using a multimeter and following safety precautions, the initial voltage check is a reasonable DIY first step.

Repair costs depend on the root cause. If the issue is a loose connector or a home voltage problem, there may be minimal cost involved. Replacing a compressor or blower motor inverter board typically ranges from $150 to $400 or more depending on parts and labor in your area. Replacing the motor itself can push costs higher. Getting a diagnostic inspection first will help you understand the most cost-effective path forward.