H1
Drazice
Evaporator Temperature Sensor Fault
Drazice heat pump water heater displays H1; reduced or no heating via heat pump mode.
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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 evaporator NTC sensor, sensor dislodged from coil, damaged sensor wiring, moisture in sensor connector
How to Fix / Troubleshooting
Power off: Disconnect the unit from mains before accessing internal components.
Check evaporator sensor:
- Remove the cover to access the heat pump section and locate the evaporator coil and its NTC sensor (usually clipped to the coil tubing).
- Inspect the sensor and wiring for physical damage or corrosion.
- Disconnect the sensor from the control board and measure resistance at ambient temperature; compare with the specified NTC curve.
- If out of range, replace the evaporator NTC sensor with an OEM part and clip it firmly back onto the coil.
- Ensure the sensor cable is routed away from sharp edges and hot components.
- Restore power and verify that H1 clears and the heat pump resumes normal operation.
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Repair Difficulty
Hard
4/5
Required Part
Evaporator NTC Sensor
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