E13
OK
Low Voltage Supply or Relay Drive Error
Microwave displays E13; interior light and fan may not operate
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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 regulator on control PCB, Open main relay coil, Broken solder joint on relay pins, Loose low-voltage harness connector
How to Fix / Troubleshooting
Safety: Unplug the microwave before removing the control panel or cover.
- 1. Check display brightness: If the display is dim or flickering along with E13, the low-voltage supply is suspect.
- 2. Inspect control PCB: Remove the control panel and examine the board for bulging capacitors, burnt resistors, or cracked solder joints around the main relay.
- 3. Reseat connectors: Disconnect and reconnect the low-voltage harness from the transformer or switching supply to the control PCB.
- 4. If you have soldering skills: Reflow any visibly cracked solder joints on the relay pins. Otherwise, replace the control PCB.
- 5. If E13 persists: Replace the control PCB assembly.
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Repair Difficulty
Hard
4/5
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