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My suprima 60L takes ages to heat the rads?

My Potterton Suprima 60L (installed 2001) on firing up Flames for only about 2/3 minutes then goes out and remains out for probably 5 minutes or more. Then on again for another 2 minutes and off for another 5 mins and so on, consequently it takes ages before the whole system gets hot. Everything else appears to be working OK. a thermistor has been replaced but to know avail
DnA, September 2009
I would check your pump is woring ok and at the right speed, It sound like the boiler gos off because its too hot ,David

capitalboilers.co.uk, September 2009
link Click here to see other fixes for Potterton Suprima 60L.