E13
Blomberg Internal Power Supply Instability

Microwave shows E13 and the clock resets or display flickers during operation.

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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

Failing low-voltage transformer or SMPS on control board,Dried or bulging electrolytic capacitors on PCB,Loose neutral or ground connection,Intermittent line fuse or thermal cut-out

How to Fix / Troubleshooting

Safety: Unplug the microwave before opening the cabinet. Capacitors on the control board can hold charge.

User checks:

  • 1. Verify outlet: Test the microwave on a different, known-good outlet. If E13 disappears, the original circuit may be unstable.
  • 2. Avoid shared high-load circuits: Do not run the microwave on the same circuit as heavy appliances that cause voltage dips.

Advanced steps:

  • 3. Inspect control board capacitors: Look for swollen or leaking capacitors in the low-voltage section. Replace the board or capacitors as appropriate.
  • 4. Check internal connections: Verify that all ground and neutral connections are tight and free of corrosion.
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Repair Difficulty

Hard 4/5

Required Part

Control Board Power Supply Section
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