Vokera Domestic Hot Water NTC Sensor Fault

Boiler displays 13; temperature readings are unstable, and the boiler may short-cycle.

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

Faulty DHW NTC sensor, loose sensor connection, scale build-up on the sensor pocket, PCB input fault.

Safety first: Turn off power and isolate the cold water supply before removing DHW components.

Symptom check: Hot water temperature may fluctuate or be excessively hot or cold.
Engineer checks:
- Measure the resistance of the DHW NTC at known temperatures.
- Inspect the wiring and connector to the PCB.
- Descale the sensor pocket or plate heat exchanger if heavily scaled.

Replacing the DHW NTC is usually a simple job but may require draining the DHW side.

Medium 3/5

DHW NTC Temperature Sensor

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