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ok gordon thanks will try first thing 2morro and let u know

i have a potterton 24 performa 3 yr old when i turn on hot tap boiler ignites burner flares up for about 10 seconds then goes out but flares up again it does this for around 5 mins running hot then cold after 5 mins it is ok. as anyone got any ideas wot causes this ,i have changed flame sensor