H26
Panasonic Combustion Safety / CO Sensor Error (model‑dependent)

Heater displays H26; may be associated with abnormal combustion or CO sensor on some models.

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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

Faulty combustion safety sensor, Blocked flue causing poor combustion, Loose sensor wiring, Defective PCB safety circuit

How to Fix / Troubleshooting

Carbon monoxide danger: If a combustion or CO‑related error occurs, do not operate the heater until it is inspected. Ensure the area is ventilated.

  • 1. Ventilate the area: Open windows and doors to disperse any possible combustion gases.
  • 2. Inspect flue and intake: Ensure there are no obstructions and that the flue is correctly installed.
  • 3. Check sensor wiring (qualified persons):
    • Remove the front cover.
    • Locate the combustion safety or CO sensor and verify wiring is intact and connected.
  • 4. Do not bypass sensors: Never short or bypass safety sensors to clear the error.
  • 5. Contact an authorized technician: A professional must test combustion, verify safe operation, and replace any faulty sensors or PCB components.
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Repair Difficulty

Professional Required 5/5

Required Part

Combustion Safety Sensor
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