BoilerFaultCodesYour boiler is struggling because there is trapped air circulating inside, which is causing the internal pump to make a loud, grinding, or rattling noise.
This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.
Technical description: Pump noisy - Air in system
DIY fix possible
Switch off the boiler and allow the system to cool down.Bleed all radiators in the house starting from the lowest floor to the highest to release trapped air.Check the system pressure gauge and top up the boiler loop to between 1 and 1.5 bar if it has dropped.
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