16
Vokera
DHW NTC Sensor Fault / DHW Overheat
Vokera water heater shows code 16, appliance shuts down on DHW temperature fault, water may be excessively hot or cold
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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
Failed DHW NTC sensor, Scale on DHW heat exchanger, Sticking DHW modulating valve, Wiring fault to DHW sensor
How to Fix / Troubleshooting
Safety first: Risk of scalding. Turn off the heater if hot water temperature is uncontrollable.
User checks:
- Set the DHW temperature knob to a moderate setting and see if the temperature stabilises.
- If water is dangerously hot, do not use the hot taps until repaired.
Engineer checks:
- Measure the DHW NTC sensor resistance and replace if out of range.
- Inspect the DHW plate heat exchanger for limescale and clean or replace if restricted.
- Check operation of the DHW modulating valve or motorised valve (if fitted).
- Inspect wiring between the DHW sensor and PCB.
Correct DHW temperature control is essential for safety; have a qualified technician carry out repairs.
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Repair Difficulty
Hard
4/5
Required Part
DHW NTC Sensor
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