BoilerFaultCodesTechnical description
Electronics/sensor fault: Short-circuit in flow or return sensor or electronics defective
What causes this fault?
This fault occurs when the boiler's internal computer receives conflicting or impossible signals from its temperature sensors. It is usually caused by a short circuit in the wiring or a total failure of the NTC sensors that measure water temperature, but it can also indicate that the main control board is no longer processing data correctly. To prevent overheating, the boiler immediately shuts down until the faulty electrical component is replaced.
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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