H16
Panasonic Heat Exchanger Temperature Sensor Error

Heater shows H16 and stops; may be related to abnormal water temperature readings.

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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 heat exchanger thermistor, Loose sensor mounting, Damaged sensor wiring, Defective PCB sensor input

How to Fix / Troubleshooting

Burn hazard: Allow the unit to cool before touching the heat exchanger area.

  • 1. Power reset: Turn OFF power for several minutes, then restore and test.
  • 2. Access heat exchanger sensor (qualified persons):
    • Remove the front cover.
    • Locate the thermistor attached directly to the heat exchanger body.
  • 3. Inspect wiring and connector:
    • Check for loose, corroded, or heat‑damaged connectors.
    • Reseat the connector at both ends.
  • 4. Check sensor mounting:
    • Ensure the sensor is firmly attached to the heat exchanger surface as specified by Panasonic.
  • 5. Replace sensor: If wiring is intact but H16 persists, replace the heat exchanger temperature sensor with a genuine Panasonic part.
  • 6. If unresolved: The PCB may be misreading the sensor and should be tested by an authorized technician.
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Repair Difficulty

Medium 3/5

Required Part

Heat Exchanger Temperature Sensor
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