BoilerFaultCodesWhat the manual says
Manufacturer manualFault:Flowsensor Flowtemperaturesensorsignallingconstantvalue: – Flowtemperaturesensorincorrectlypositionedatflowpipe – Flowtemperaturesensordefective
What causes this fault?
This fault occurs when the boiler's internal computer notices that the flow temperature sensor is sending exactly the same temperature reading for too long, even while the burner is firing. The most common reason is that the sensor has physically failed or developed a high resistance, meaning it can no longer detect the actual rise in heat. It can also be caused by a loose connection or damaged wiring preventing the sensor from communicating correctly with the main control board.
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.
Avoid the next call-out bill
A cover plan would handle faults like F.71: no call-out fees, no surprise bills.
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