E10
Blomberg
Relay Drive or Power Relay Failure
Microwave displays E10 and the interior light and fan do not turn on when starting a cycle.
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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 main power relay on control board,Burned relay contacts,Defective control board relay driver circuit,Loose wiring from relay to line input
How to Fix / Troubleshooting
Safety: Unplug the microwave before opening the cabinet. High-voltage hazards exist inside.
User-level confirmation:
- 1. Verify symptom: When you press Start, listen for a click from inside the control area. If there is no click and E10 appears, the main relay may not be engaging.
- 2. Try another program: Test multiple power levels and cooking modes to rule out a programming issue.
Advanced steps:
- 3. Inspect control board: Remove the control panel and examine the main PCB. Identify the power relay(s) and check for burn marks or cracked solder joints.
- 4. Test relay coil: With the board removed and using a multimeter, test the relay coil resistance. If open, the relay must be replaced (board-level repair) or the entire board replaced.
- 5. Check wiring: Ensure that the line input and output wires from the relay are secure and not overheated.
Because this involves live mains switching, relay replacement is best handled by a professional.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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