Technical description
Burner control box lockout safety feature. Could be caused by: An interruption in the fuel supply; An electrical supply fault; A fault with the burner or its safety control system; The failure of a component (e.g. photo cell); Worn or dirty oil nozzle.
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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