F3
Vax
Brush Motor Speed Control Fault
F3 displayed, brush speed fluctuates or stops intermittently
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Worn brush motor, Loose brush motor connector, Faulty speed control circuit on PCB, Excessive load from jammed brush bar
How to Fix / Troubleshooting
Safety first: Unplug the carpet cleaner before working on the brush system.
- Check brush bar for drag: Remove the bottom plate and brush bar. Clean hair and debris from the bar and end caps. Ensure it spins freely by hand.
- Inspect brush motor connector: Locate the brush motor and check its plug connection. Reseat firmly.
- Test brush motor: With the motor removed (for trained persons), apply the correct DC/AC voltage briefly to see if it runs smoothly. If it stalls, sparks excessively, or is noisy, replace the brush motor.
- Inspect PCB speed control: Look for burnt or cracked components in the brush motor control section of the PCB. If damaged, replace the PCB.
- Reassemble and test: Refit the brush bar, belt (if used), and covers. Test brush operation under load.
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Repair Difficulty
Hard
4/5
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