Bush No Power – Primary Power Circuit Failure

Microwave does not start at all; display is blank and no lights or sounds.

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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

Blown internal mains fuse, Faulty mains power cord, Faulty door interlock preventing power, Failed control PCB power supply

How to Fix / Troubleshooting

Safety: Unplug the microwave before opening the cabinet. Internal fuses are on live circuits.

  • Check outlet: Test the wall socket with another appliance to confirm power is present.
  • Inspect power cord: Look for cuts, burns, or kinks. If damaged, the cord must be replaced by a qualified technician.
  • Check internal fuse: Remove the outer cover and locate the mains fuse near the power cord entry. Test with a multimeter. If blown, investigate for underlying faults (e.g., shorted HV components) before replacing with the exact same rating.
  • Door interlock: A failed interlock can sometimes prevent power-up. Inspect switches and wiring.

If the fuse blows again immediately or the control board remains dead, the control PCB or HV components may be faulty and require professional service.

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Repair Difficulty

Hard 4/5

Required Part

Internal Mains Fuse
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