BoilerFaultCodesWhat the manual says
Manufacturer manualfan overrun
From this model's manual
Verified against the Glow Worm Ultracom 2 Cxi installation & service manual, page 52.
What causes this fault?
This status occurs when the boiler's fan continues to run for an extended period after the burner has finished heating your home or water. It is usually caused by the main circuit board failing to tell the fan to stop, or the fan itself sending an incorrect signal back to the control system. While it often resolves itself, it can sometimes suggest the electronic components are beginning to wear out.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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