H4
Midea
Inverter Overheat / Overcurrent Protection (Inverter Models)
Microwave shows H4; unit may not heat or may shut down quickly.
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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
Inverter board overheating, Blocked inverter heat sink, Shorted magnetron, Poor ventilation around electronics
How to Fix / Troubleshooting
Safety warning: Inverter circuits are high-voltage and high-frequency; only trained technicians should service them.
User-level checks:
- 1. Ensure ventilation: Confirm that vents are unobstructed and that the microwave is not installed in a confined space without proper airflow.
- 2. Avoid extreme use: Do not run repeated back-to-back high-power cycles that can overheat the inverter.
- 3. Power reset: Unplug for 10 minutes, then plug back in and test. If H4 returns quickly, internal service is required.
Technician-level checks:
- Inspect inverter heat sink and fan (if present) for dust and blockage.
- Test magnetron and inverter for shorts or overcurrent conditions.
- Replace inverter board and/or magnetron as needed.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Power Board for Midea Microwave
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