E12
OK
Inverter Power Module Fault (Inverter Models)
Microwave shows E12; fan may run briefly then stop; no heating
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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 inverter power module, Open or shorted inverter wiring to magnetron, Faulty inverter feedback to control PCB, Overcurrent in inverter circuit
How to Fix / Troubleshooting
Critical safety: Inverter-based microwaves operate at very high voltages and frequencies. Do not attempt inverter repairs without proper training and equipment.
- 1. Confirm inverter model: Check the rating label or service manual for your OK microwave to see if it uses an inverter instead of a traditional transformer.
- 2. Basic test: Try a short cook cycle with a cup of water. If the fan and turntable run but there is no heat and E12 appears, the inverter or magnetron circuit is at fault.
- 3. Visual inspection only: With the unit unplugged, remove the cover and visually inspect the inverter board for burnt components or cracked solder joints. Do not touch the board components.
- 4. Recommended action: In most cases, the inverter module is replaced as a complete assembly along with inspection of the magnetron. This should be done by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Power Module
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