BoilerFaultCodesWhat the manual says
Manufacturer manualGeneral fault; requires momentary interruption of the electrical supply to reset.
What causes this fault?
This fault occurs when the boiler's internal electronics detect a communication error or a safety interruption that prevents the system from starting. The most common reason is a temporary glitch in the control board or a sensor that has tripped due to minor overheating or a failed ignition attempt. It acts as a safety barrier to ensure the boiler does not operate until a qualified person or a manual reset has cleared the issue.
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 Red light (flashing): no call-out fees, no surprise bills.
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