Whirlpool Dryer Error Code F-45

The F-45 code indicates a motor control electronics speed sensor failure. The motor control unit monitors the drive motor's rotational speed and has detected that the speed sensor signal is missing or invalid. The dryer shuts down to prevent further damage when this fault is detected. Diagnosis should begin with TEST #3b to isolate the specific failed component.

No, you should not attempt to operate the dryer while the F-45 code is active. The fault indicates that the motor control system cannot properly monitor the drive motor speed, which could allow the motor to overheat or operate in an uncontrolled state. Continuing to run the dryer risks additional damage to the motor or control board. Address the fault before resuming use.

Repair costs depend on which component has failed. If the issue is simply a loose connector or damaged wire, the repair cost may be minimal, primarily covering labor if a technician is involved. A replacement speed sensor typically costs in the range of $20 to $60 for the part. A motor control board is considerably more expensive, often ranging from $100 to $250 or more for the part alone, plus labor if professionally repaired.

A knowledgeable DIYer can attempt basic steps such as inspecting the wiring harness, checking for loose connectors, and cleaning corroded terminals. However, properly diagnosing this code requires following the TEST #3b procedure, which involves testing live circuits and interpreting voltage and continuity readings. Replacing the motor control board or speed sensor is within reach for experienced DIYers, but if you are not comfortable working around electrical components, a qualified technician is recommended.

A power reset, such as unplugging the dryer for a few minutes, may temporarily clear the code, but it will return as soon as the dryer attempts to run if the underlying fault is still present. The F-45 code indicates a hardware or wiring failure that requires physical diagnosis and repair. Resetting without fixing the root cause is not a reliable solution.