BoilerFaultCodesTechnical description
PCB processor temperature too high | Check earth connection or electronics defect
What causes this fault?
This fault occurs when the boiler's central control board becomes dangerously hot, often due to an internal electrical short or a failing component on the circuit board itself. The boiler shuts down immediately to protect the sensitive electronics from melting or causing further damage. The most common reason is that the motherboard has simply reached the end of its lifespan and can no longer regulate its own temperature.
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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