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Hello Because I've changed both, I'll gas rate it today but you'd think if it was a worn injector it would be a problem on full demand and not when it's nearing temp and racking back wouldn't you?

Hello The systems full and clean and the automatics working ok, I'm leaning towards the diverter assembly, maybe worn or something? Thanks for your help cheers

Hello Has anyone come across this problem. It's a high pitched whine when the boiler's approaching temperature and it's not the pump or fan bearings. Thankyou