BoilerFaultCodesTechnical description
Burner blocked: Flue gas temperature sensor short circuit
What causes this fault?
This fault occurs when the boiler's internal computer detects a physical failure in the sensor that monitors the heat of the exhaust gases. The most common reason is that the sensor's internal wiring has degraded or failed entirely, leading to an incorrect electrical signal that forces the boiler to shut down to prevent overheating.
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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