F43
Whirlpool Washing Machine
Severity: ModerateWhat Does This Error Mean?
The F43 error on a Whirlpool washer means the motor control unit detected that the drum motor is not responding correctly to speed commands — the motor is running but not at the right speed or direction. This is an electronic motor control fault that usually needs a technician.
Affected Models
- WFW5620HW
- WFW8620HW
- WTW7120HW
- WFW9620HC
- Most Whirlpool front-load washers
Common Causes
- Motor control unit is failing and cannot regulate motor speed accurately
- Motor winding has developed a partial fault
- Hall sensor is malfunctioning and sending bad speed data
- Wiring between the MCU and motor is damaged
- Main control board is sending incorrect commands to the MCU
How to Fix It
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Unplug the washer from the wall outlet and wait 15 minutes.
A thorough power reset sometimes resolves temporary motor communication faults. This is always the first step.
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Inspect the power cord and outlet for any damage or loose fit.
A loose plug can cause voltage fluctuations that trigger motor control faults. Make sure the plug is fully seated in a working outlet.
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Check that the drum is not overloaded.
Overloading strains the motor and can cause it to run off-speed. Remove some items and see if the error clears.
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Plug the washer back in and run a wash cycle with a half load.
If the cycle completes without F43, overloading may have been the issue. Continue monitoring.
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If F43 returns with a normal load, call a technician to test the MCU and motor.
The motor control unit is the most likely faulty component. A technician can confirm and replace it.
When to Call a Professional
F43 is typically a motor electronics fault. The MCU and motor wiring need to be tested with a multimeter and oscilloscope in many cases. Expect repair costs of $150–$350 for diagnosis and parts.
Frequently Asked Questions
Why does my Whirlpool washer keep getting motor errors?
Repeated motor errors usually indicate either a failing motor control board or an aging motor. Occasionally the root cause is a bad power supply — voltage fluctuations from the house wiring. Have an electrician check your outlet voltage if the MCU replacement does not fix it.
Can I diagnose F43 myself?
You can rule out simple causes like overloading and power supply issues. Actually diagnosing whether the MCU or motor is at fault requires a multimeter and knowledge of expected resistance values. For most homeowners, calling a technician is the practical choice.
Should I repair or replace my Whirlpool washer if it shows F43?
If your washer is under 8 years old and otherwise in good condition, repairing it is usually worth it. Motor control board replacement typically costs $150–$350. If the machine is older or has had multiple repairs, compare the repair cost against a new machine before deciding.