Whirlpool Dryer Error Code F18

F18 indicates that the Motor Control Unit (MCU) has detected an over-temperature condition and shut down to protect itself from heat damage. The MCU controls the drive motor, and this fault triggers when the board gets too hot during operation. It can be caused by venting restrictions, a struggling motor, worn mechanical components, or a failing MCU board. The dryer must be turned off and unplugged, and allowed to cool for several minutes before any diagnosis begins.

No, you should not continue running the dryer while F18 is active. The code indicates the motor control board has overheated, and continued operation could cause permanent damage to the MCU or create a fire risk if the underlying cause involves restricted venting or a failing motor. Turn the dryer off, unplug it, and allow it to cool before investigating the cause.

Repair costs vary significantly depending on what is causing the overtemperature condition. Clearing a blocked vent is essentially free if done yourself, while replacing drum rollers or an idler pulley typically costs between $20 and $80 in parts. A replacement drive motor can range from $80 to $200 in parts, and a new MCU board often falls between $100 and $300, with professional labor adding $75 to $150 or more on top of parts depending on your area.

Some causes of F18 are DIY-friendly, such as cleaning out a blocked exhaust vent or reseating a loose wiring harness connector at the MCU. Replacing worn drum rollers or an idler pulley is also a manageable repair for someone comfortable with basic appliance disassembly. However, replacing the drive motor or MCU board involves higher-voltage components and is best handled by a technician if you are not experienced with appliance electrical repairs.

Unplugging the dryer and allowing it to cool may clear the fault temporarily, but the code will return if the underlying cause is not addressed. Because F18 is triggered by a real thermal condition, a simple reset without fixing the root problem, such as a clogged vent or a failing motor, will only result in repeated shutdowns. Resolve the cause first before returning the dryer to service.