H0
Haier
Humidity/temperature protection or sensor abnormality (variant code)
Microwave displays H0 or HO and does not heat
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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
Overheated cavity, Faulty humidity or temperature sensor, Blocked vents, Control board misreading sensor
How to Fix / Troubleshooting
Safety: Unplug the microwave before cleaning or inspection.
- Ventilation check: Ensure at least the manufacturer-recommended clearance around the microwave. Remove any items blocking vents.
- Cool-down period: Leave the door open and allow the unit to cool for 30–60 minutes. Then plug it back in and test.
- Clean interior: Wipe down the cavity, especially around any sensor grilles, to remove steam residue and grease.
- Reset: After cooling and cleaning, perform a power reset by unplugging for 5 minutes, then test with a cup of water.
- Persistent H0: Likely indicates a failing sensor or control board. Replacement of the cavity sensor or PCB may be required by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Cavity Sensor (Humidity/Temperature)
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