H0
Danby
Humidity Sensor or Steam Sensor Error (Sensor Cooking Models)
Microwave displays H0 or HO; unit may not start or may stop heating unexpectedly.
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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
Contaminated humidity sensor, Open or shorted humidity sensor, Loose sensor wiring, Failed control board sensor circuit
How to Fix / Troubleshooting
Safety first: Unplug the microwave before accessing internal components.
- Clean interior: Wipe down the entire interior cavity, especially the upper area where the humidity sensor is often located behind a small grille or cover. Remove grease and food residue.
- Allow to dry: Leave the door open for an hour to ensure the cavity and sensor area are dry.
- Test non-sensor modes: Try heating a cup of water using a manual time/power setting. If this works but sensor modes fail with H0, the humidity sensor is suspect.
- Advanced check: With the cabinet removed and power disconnected, locate the humidity sensor module and verify its connector is firmly seated.
- Next step: If H0 persists, the humidity sensor or control board must be replaced. This is a moderate repair; consider a technician.
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Repair Difficulty
Medium
3/5
Required Part
Humidity Sensor
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