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chris soon as i altered the pump speed re earlier response it started banging so i bled it and at mo ok. it is fed from a small loft tank and level does drop when i bleed system so the feed should be ok, when system is running ok all pipes and rads are hot as they should be then all of a sudden...

have just been and checked pump body is very hot to the touch is this a clue

have not checked the pressure this is not a combi boiler (more of an antique) the system was fine until about a couple of months ago then it did it once in a while but the last couple weeks this is happening more often could this be an intermmitant pump fault? tho it seems to function at the mo...

Chaffoteaux et Maury is the maker the boiler is mounted upstairs and the highest point of the system are the water inlet /outlet pipes which i have been bleeding to get the system to function all radiators work fine as does hot water by messing to get it started i mean bleeding the boiler and...

the boiler is a challenger 40 by boiler outlet i mean the hot water outlet from the boiler pump speed is on no2 of 3 (and not been altered)

can anyone help please have challenger boiler problems.... heating and hot water will run for 24/48 hrs then system will stop, red cut out pops out and pilot goes out system will restart after a lot of messing ,when boiler fires up there is a banging noise then it cuts out again after a lot...