H28
Panasonic
Humidity Sensor Communication / Calibration Error
Unit displays H28; humidity reading may be frozen or unrealistic.
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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
Corrupted sensor data, Loose sensor connection, Incompatible replacement sensor, Main PCB firmware fault
How to Fix / Troubleshooting
Safety first: Disconnect power.
- Reset control: Unplug for 10 minutes to reset the microcontroller, then power back on and check if H28 clears.
- Check sensor harness: Inspect the humidity sensor wiring for damage and ensure the connector is fully seated and oriented correctly.
- Use correct part: If the sensor was recently replaced, verify that a Panasonic‑approved sensor with the correct part number was installed. Replace with the correct part if necessary.
- Firmware/PCB issue: If wiring and sensor are correct and H28 persists, the main PCB may have a firmware or hardware fault. Board replacement is recommended via an authorized service center.
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Repair Difficulty
Hard
4/5
Required Part
Humidity Sensor Module
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