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just had the combi serviced a couple of weeks ago. worked fine until saturday at which point it has started acting very strangley. :shock: Comes on ok when taps upstairs used when heating comes on, the pump works for 15-20 seconds before bolier lights boiler will not light when hot water...

I have a potterton combi bolier. syetem is about 6/7 yrs old. towards the end of last winter we started getting a few tapping noises coming from the pipe leading to the last radiator in the system. last couple of weeks the noise has got really loud. it seemd to coincide when the bolier is...