Hansa
Stuck Relay or Shorted Control Circuit
Microwave interior light, fan, and turntable run when the door is closed, even without pressing START.
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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
Stuck power relay on control board, Shorted triac or transistor, Miswired control harness, Control board failure
How to Fix / Troubleshooting
Safety first: Immediately unplug the microwave. This condition is unsafe.
- Do not use the appliance: Continuous operation without command can overheat components and pose a fire risk.
- Power reset: After a few minutes, plug in briefly to confirm if the behavior persists. If it does, unplug again and leave disconnected.
- Professional service: The control board relays and switching components must be inspected and replaced as needed. This is not a user-serviceable repair.
Warning: Do not attempt to operate the microwave until the fault is corrected.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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