BoilerFaultCodesTechnical description
Without time delay
What causes this fault?
This fault occurs when the boiler's central brain loses contact with the sensors that monitor heat levels, often due to a broken internal wire or a sensor that has failed completely. Because the control system can no longer safely tell how hot the water is, it shuts down to prevent the system from overheating. It is usually caused by a physical break in the electrical circuit or moisture damage to the sensitive electronic connections.
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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