Drazice Coil Temperature Sensor Fault

Drazice combined heater shows F2; coil heating does not operate even though boiler is hot.

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.

Possible Causes

Defective coil NTC sensor, sensor not properly inserted into coil well, damaged cable, corroded connector on control board

Power off: Disconnect mains power.

Check coil sensor:

Locate the sensor that measures the temperature of the internal heat exchanger coil (usually in a dedicated well on the tank).
Ensure the sensor is fully inserted and secured.
Test resistance at ambient temperature and compare with specification.
Replace the coil NTC sensor if readings are incorrect.
Inspect and clean the connector on the control board.
Restore power and verify that F2 is cleared and coil heating resumes.

Medium 3/5

Coil NTC Temperature Sensor

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