H27
Panasonic Indoor Humidity Sensor Fault (models equipped with humidity control)

Indoor unit shows H27; operation stops or is restricted.

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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

Failed indoor humidity sensor module, Loose sensor connector, Damaged indoor PCB input circuit

How to Fix / Troubleshooting

Safety first: Disconnect power before opening the indoor unit.

Steps:

  • 1. Identify humidity sensor: On models with humidity control, the sensor is often located near the air intake grille or on a small daughter board.
  • 2. Check connection: Ensure the sensor's small connector is firmly attached to the indoor PCB or sub-board.
  • 3. Inspect for contamination: Dust or moisture on the sensor can cause errors. Gently clean around the sensor with dry air; do not wet the sensor.
  • 4. Replace module: If H27 persists, replace the humidity sensor module with a Panasonic-compatible part.

If replacement does not clear the error, the indoor PCB may be faulty and should be serviced by a professional.

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Repair Difficulty

Medium 3/5

Required Part

Indoor Humidity Sensor
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