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check out the kingspan website it has comprehensive diagrams and installation instructions for various roof conditions.don't think thermal bridging through timber is to much of a problem as if the timber depth allows you can put the entire amount of insulation in the rafters as long as...

cheers guys just got one posted to me for £40 i'll give it a try.

Nice one girls,do you reckon that the other faults can be ruled out i.e.gas valve and pcb,how would a blocked heat exchanger cause the burner to cut in and out?

Thanks for the wand advice,is there an effective way to clean it though.

The plate heat exchanger was cleaned by washing it through under a tap for about 20min and there was a fare amount of black fine deposits that came away.The d.h.w temperature dial is definitely working as i turned it down to minimum and the water was heated acordingly plus the burner remained...

boiler kicking in and heating water on demand but when full temperature is reached and held for a short time[20secs approx]burner cuts out and water goes almost cold before burner kicks back in.Secondary heat exchanger has been taken out and cleaned as has temperature sender but still no...