Microwave shows E9 and stops heating; fan may continue briefly, then shut off.
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.
Possible Causes
How to Fix / Troubleshooting
Critical Safety: High-voltage repairs should only be performed by qualified technicians. The following user steps are limited to external checks.
User-level steps:
- 1. Confirm heating: Test with a cup of water. If E9 appears and the water is barely warm or cold, the magnetron circuit is underperforming.
- 2. Power reset: Unplug for 10 minutes and retry. If E9 recurs consistently, internal components are likely failing.
Technician-level steps:
- Unplug and remove the outer cover.
- Inspect all high-voltage wiring to the transformer, capacitor, diode, and magnetron for discoloration, loose terminals, or arcing marks.
- Test the magnetron, HV transformer, and HV diode with appropriate methods and replace any out-of-spec components.
Note: Because of the risk, most users should arrange professional service for E9 faults on Tower microwaves.
Repair Difficulty
Required Part
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