Whirlpool Dryer Error Code F:42

The F:42 code means the motor control board has detected a supply voltage lower than 90 VAC, which is an undervoltage condition. Whirlpool dryers require approximately 240 VAC to operate, and this error triggers when the incoming power drops below the safe operating threshold. The fault is most often related to the home's circuit breaker or electrical supply rather than a failed dryer part. Running the built-in line voltage diagnostic is the recommended first step.

No. When the F:42 code is active, the dryer has detected an unsafe power supply condition and will not operate normally. Continuing to attempt operation with an undervoltage supply can stress the motor, control board, and other electronics. The underlying power issue should be diagnosed and corrected before using the dryer again.

Repair costs vary widely depending on the root cause. Replacing a household circuit breaker typically runs between $150 and $300 with an electrician. A new dryer power cord costs between $15 and $40 in parts, while a terminal block replacement is generally in the $20 to $50 range. If the motor control board is at fault, that component can range from $100 to $250 or more in parts alone, plus labor.

Some causes of the F:42 code, like a tripped circuit breaker, are straightforward to address yourself. However, checking terminal block connections, measuring voltage at the panel, and inspecting the power cord involve working with high-voltage wiring, which carries serious shock risk. If you are not experienced with electrical work, this repair should be handled by a qualified appliance technician or licensed electrician.

Resetting the dryer by unplugging it or cycling the breaker may temporarily clear the code, but if the underlying voltage problem is not corrected, the fault will return immediately or as soon as the motor attempts to start. A reset is not a fix and should only be used as part of the diagnostic process to confirm the fault is repeatable.