E20
MasterChef
Heating Element Circuit Fault (Grill/Convection)
Microwave shows E20 and beeps; occurs when starting grill or convection on combo models.
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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
Open grill element, Open convection heater, Burned wiring to elements, Failed heater relay on control board
How to Fix / Troubleshooting
Safety first: Unplug the microwave and allow it to cool before inspection.
Steps:
- 1. Visual inspection: Look at the grill element inside the cavity for visible breaks, blisters, or burn spots.
- 2. Test other modes: Check if standard microwave-only cooking works. If only grill/convection fails with E20, the issue is isolated to the heater circuit.
- 3. Internal checks (experienced DIYers): Remove the cabinet and inspect wiring to the grill and convection elements for burns or loose connectors.
- 4. Continuity test: With a multimeter, test the grill and convection elements for continuity. Replace any open element.
Next steps: If elements test good, the heater relay or control board may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Grill Heating Element
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