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hi. just wondering how to determine pump overun failure. if p/overrun stat is broken i know how to test for that( getting into repairs after servicing for past year)ive heard pcb and ignition timeout also cause pump overun failure? how to test these. thanks

hi. would a reading of 4bar on combi be classified as at risk considering the prv hasnt discharged?

could anyone explain why burner pressures decline? assuming piping , meter and gas valve filter not clogged up why do they decline. i find myself constantly adjusting burner pressures whilst servicing? curious as ive never had it explained. other engineers dont seem to know either!!!!!!

another question from myself regarding fault finding. on combi boilers what is the best and quickest way to speed test that the combi external controls programmer and stat are working. ive been told that the best way is to measure at the pcb but how do you recognise stat and prog connections on...

great site. i have two questions regarding boiler repairs and would greatly appreciate any input 1) if a faulty electrode is suspected how do you test the electodes integrity? 2)how do you alter gas rates for boilers where there is no burner pressure points? someone has said adjust the...