A06
Vokera Flow or Return NTC Sensor Error (Alpha Code)

Boiler displays A06, NTC sensor fault indicated, boiler may not fire

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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

Open or short-circuit NTC sensor, Loose connector, Damaged wiring, PCB fault

How to Fix / Troubleshooting

Safety first: Isolate power before accessing internal components.

  • Engineer checks:
    • Identify which NTC (flow or return) is indicated by the diagnostic menu.
    • Measure resistance of the sensor and compare with Vokera charts.
    • Inspect wiring and connectors for damage.
    • Replace the faulty NTC if readings are incorrect.

Sensor replacement is usually low complexity but should be done carefully to avoid leaks.

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Repair Difficulty

Medium 3/5

Required Part

Flow NTC Temperature Sensor
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