H1
Haier
Overvoltage or power supply protection
Microwave shows H1 and beeps, cooking disabled
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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
Line voltage too high, Faulty power supply circuit on main PCB, Incorrect wiring or outlet, Surge damage
How to Fix / Troubleshooting
Safety: Unplug the microwave before moving or testing outlets.
- Check outlet: Ensure the microwave is plugged directly into a properly grounded outlet. Do not use extension cords or power strips.
- Test voltage (if equipped): If you have a multimeter and know how to use it, verify that the outlet voltage is within your region's standard (e.g., ~120V or ~230V). If it is significantly high, contact an electrician.
- Power reset: Unplug the microwave for 10 minutes, then plug back in and test.
- Try another outlet: Move the microwave to a different known-good outlet on a different circuit and test.
- If H1 persists: The internal power supply or control board may be damaged and should be replaced by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (Power Supply Section)
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