Moffat Dryer Error Code F4

The F4 code on a Moffat dryer means the drying cycle was interrupted before it could complete. The dryer detected an abnormal condition and halted operation as a result. Common causes include restricted airflow, a faulty door switch, or a triggered thermal safety component. Investigating these areas first will help identify the root cause.

It is not advisable to continue operating the dryer while F4 is active without first identifying the cause. If the interruption is triggered by overheating due to a blocked vent, running the dryer could pose a fire risk. Resolve the underlying cause before resuming use to ensure safe operation.

Repair costs vary depending on which component has failed. Cleaning a vent or sensor is essentially free if done yourself. Replacing a door switch or thermal limiter typically ranges from a modest parts cost of around $10 to $40 for the part, plus labor if a technician is involved. A control board replacement is the most expensive scenario, with parts and labor potentially ranging from $150 to $350 or more depending on the service provider and part availability.

Start by clearing any lint from the exhaust vent and confirming the vent path is unobstructed from the dryer to the exterior. Check that the door latches securely and test the door switch for continuity. Clean the moisture sensor strips inside the drum with a mild abrasive or isopropyl alcohol. If the error persists after these steps, a thermal limiter, thermostat, or control board may need professional testing and possible replacement.

Unplugging the dryer for several minutes and then restoring power may clear the F4 code temporarily, but it will likely return if the underlying issue is not addressed. A reset does not fix a blocked vent, failed door switch, or faulty thermal component. Treat the reset as a diagnostic step, not a solution.