H25
Panasonic Heater Overheat / Dry-Fire Protection Triggered

Dishwasher displays H25 and does not heat water properly

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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

Scale buildup on heater, Insufficient water level over heater, Faulty NTC sensor misreading temperature, Stuck heater relay

How to Fix / Troubleshooting

Safety first: Disconnect power and allow the unit to cool before inspection.

  • Check water level: Start a cycle and open the door after filling (machine paused). Water should cover the filter area adequately. If low, investigate inlet and level sensor issues.
  • Descale dishwasher: Run an empty hot cycle with a dishwasher descaler suitable for Panasonic machines to remove limescale from the heater and tub.
  • Inspect NTC sensor: Access the NTC at the sump or heater housing and verify it is firmly seated and not coated with heavy scale. Clean gently if needed.
  • Reset error: After descaling and checks, disconnect power for 5 minutes, then retry a cycle.

If H25 persists, the heater control circuit or NTC may be faulty and should be tested and replaced by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Heater Element Assembly
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