BWT Perla
Stalled Valve Motor
BWT Perla makes a constant humming sound but does not change valve position
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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
Seized rotor disc, Obstructed piston or seal pack, Motor receiving power but unable to turn, Mechanical obstruction in valve head
How to Fix / Troubleshooting
Safety first: Immediately disconnect power to prevent motor overheating. Close inlet and outlet valves and relieve pressure.
- Manual rotation test: With the cover removed and power off, attempt to gently rotate the main rotor shaft using the designated service tool. If it is stuck, internal components are seized.
- Check for foreign objects: Inspect the valve head for debris, broken plastic pieces, or scale buildup.
- Assess motor: If the rotor turns freely by hand but stalls under power, the motor may be weak or failing.
- Replace valve head or motor: Depending on model, replace either the motor module or the entire valve head assembly.
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Repair Difficulty
Professional Required
5/5
Required Part
Valve Motor / Valve Head Assembly
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