BoilerFaultCodesTechnical description
Fault indication / Lockout reset button
What causes this fault?
This fault occurs when the boiler's control system detects a failure in the ignition process or a loss of flame signal during operation. The most common reasons are that the burner has failed to light correctly or the internal sensors can no longer verify that a flame is present for safety. This results in the boiler shutting down immediately to prevent unburnt gas from building up in the system.
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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