Franke
Stuck Relay / Failed Power Electronics
Garbage disposal causes a noticeable buzzing or humming from the Franke control box but the motor does not run.
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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
Relay coil energized but contacts burnt, Shorted triac on Franke PCB, Internal PCB trace damage, Control board not delivering full voltage to motor
How to Fix / Troubleshooting
Safety first: Turn OFF power and discharge any capacitors before touching the control board.
- Inspect PCB: Open the Franke control box and look for burnt or discolored areas near the relay or power components.
- Check output voltage (advanced): With proper safety precautions, measure voltage at the motor output terminals when the unit is switched on. Low or zero voltage with a buzzing relay indicates board failure.
- Do not bypass safety: Never bypass the control board or hardwire the motor without proper overload protection.
- Replace control board: Install a new Franke control PCB / power module matched to your model.
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Repair Difficulty
Professional Required
5/5
Required Part
Franke control PCB / power module
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