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Hi all, i thought it would be a good idea to start a post regarding Common Problems with certain Boilers. We've all been to certain boilers where we know almost immediatley the problem (im thinking isars, Suprimas, Modenas). Having worked for BG their laptops contained common specific faults...

had a ravenheat boiler on friday...with hot warer running pressure stays fairly stable at 1bar, soon as the dhw is turned off the pressure shoots up. when u then turn the tap on the pressure drops. cant understand this..filling loop is not passing. think the expansion vessel is knackred cos...

i queried this yesterday,,,,suspect aav....it is leaking...but would that really be enough to have a full drop by morning...is prv sus?...have ordered aav anyway as it is leaking into the comustion chamber...help

got a worcester 240 balanced flue boiler..its old...pressure is droppin overnight...auto air vent appears to be weeping round edges.....could this be the problem....and can it be replaced...thanks