BoilerFaultCodesTechnical description
Flow NTC error – flow temperature sensor signal constant value
What causes this fault?
This fault occurs when the boiler's internal computer notices that the temperature reading from the flow sensor isn't changing, even though the burner is firing. The most common reason is that the sensor has physically failed or 'seized' internally, but it can also be caused by a loose connection or damaged wiring that prevents the sensor from sending updated data.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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