A07
Vokera DHW NTC Sensor Error (Alpha Code)

Boiler displays A07, indicating a DHW temperature sensor fault, leading to unstable hot water temperature.

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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, Limescale on sensor pocket, Loose wiring, PCB input fault

How to Fix / Troubleshooting

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

  • Symptom check: Hot water may be scalding hot or lukewarm, regardless of the setting.
  • Engineer tasks:
    • Test DHW NTC resistance.
    • Inspect and descale the sensor pocket or plate heat exchanger.
    • Replace the DHW NTC if it is out of specification.

Do not ignore temperature instability; it can pose a scalding risk.

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Repair Difficulty

Medium 3/5

Required Part

DHW NTC Temperature Sensor
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