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red light comes on more during hot water use I have them coming back out this afternoon so I will ask about the air pressure switch and if they changed the HW sensor fingers crossed it gets sorted Thanks for your comments

I have been having problems with my boiler for over a week now where the red light keeps coming on I have it covered with Scottish gas and they have been out on 4 separate occasions first they cleaned the venturi pipes, then replaced the CH sensor then today the engineer replaced the PCB...