E17
Grundig
Low Voltage / Power Supply Fault
Display very dim or flickering, error sometimes logged on power supply
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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
Failed low-voltage power supply on main PCB, faulty mains filter, loose neutral or live connection, internal short drawing excess current
How to Fix / Troubleshooting
Safety first: Work on mains power circuits only if you are trained and the oven is fully isolated from the supply.
- Check supply voltage: Verify that the household supply to the oven is within the specified range (typically 220–240 V AC). Low supply can cause display issues.
- Inspect terminal block: Remove the rear cover and check the mains terminal block for loose screws, discoloration, or melted plastic. Tighten connections and replace damaged blocks.
- Examine mains filter: Inspect the EMI filter for burn marks or bulging components. Replace if defective.
- Control board inspection: On the main PCB, look for bulging electrolytic capacitors or burnt resistors in the power supply section. Board-level repair or replacement may be required.
Warning: Do not continue using an oven with unstable power; it can damage electronic components further.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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