H3
Drazice Ambient Air Temperature Sensor Fault

Drazice heat pump water heater shows H3; compressor stops frequently or will not start.

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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

Defective ambient NTC sensor, sensor exposed to direct sunlight or heat source, damaged sensor cable, incorrect sensor placement after service

How to Fix / Troubleshooting

Power off: Disconnect mains power.

Check ambient sensor:

  • Locate the ambient air sensor near the air intake grille.
  • Ensure it is not touching hot pipes or components and is sensing room air only.
  • Inspect the cable for damage and test resistance at room temperature.
  • Replace the ambient NTC sensor if readings are out of specification.
  • Reposition the sensor away from direct sunlight or other heat sources.
  • Restore power and verify that H3 clears.
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Repair Difficulty

Medium 3/5

Required Part

Ambient NTC Sensor
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