E15
Bush
Relay Drive / Output Stage Fault
Microwave displays E15; clock and basic functions may work but cooking modes fail to 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
Failed relay on control PCB, Burnt relay contacts, Faulty relay driver transistor, Damaged PCB tracks to high-voltage transformer
How to Fix / Troubleshooting
Safety: Unplug the microwave before removing the control board.
- Visual inspection: Remove the control PCB and inspect the power relays (small rectangular components). Look for burn marks, cracked cases, or discoloured PCB around them.
- Check solder joints: Cold or cracked solder joints on relay pins are common. Resolder if you are experienced with electronics.
- Relay replacement: If a relay is suspected faulty (e.g., no click when starting, or welded contacts), it should be replaced with the exact type and rating. This typically requires desoldering and soldering skills.
- Consider full PCB replacement: For most users, replacing the entire control PCB with a Bush OEM part is safer and more reliable than component-level repair.
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Repair Difficulty
Professional Required
5/5
Required Part
Power Relay (on Control PCB)
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