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thanks for the reassurance guys, I'll get to drilling out the screws this weekend and descaling. the problem I'm now having is that the pressure rises intermittently, I have it at 1 bar but it seems to suddenly rise to 3+ breaching the PRV and dropping to 2 bar, I drain it back down to 1bar...

thanks for the tip Agile, I do have an impact drill though my concern was that the problem screws happened the two that didn't go straight through? (ie 3 of 5 are visible from both sides and the stuck 2 appear to terminate within the body of the water valve) anyway I'd imagine it easier to drill...

to be honest I always had the HW off when walking through the fault finder so I hadn't realised the cam made the MS on HW demand. anyway I seem to have got the CH working ...for now. the top micro now makes on CH where it didn't before - ever, apparently the bottom micro sort of makes in 2...

thanks for the link spacethegas, looked promising but mines slightly different. re both microswitches being depressed, why would the top switch not be depressed when CH only is calling? I noticed the lower arm is spring loaded and perhaps requires more pressure 'from somewhere' to it to...

thanks guys. it seems the opposite case. the spring cannot compress any further than shown in the picture. the black lever (cam?) can be pushed in the opposite (left) direction forcing the spring to stretch and the cam to push the microswitch [this DOES activate the CH but only for a few...

Hi. I've read through a few related posts and gather this is quite an oldie (and theres quite a few vaillant smarties on here) but I can't afford to replace just right now. VCW 221 H - PROBLEM : pictures of microswitch + 'stuck' return spring hot water works fine, demand, click sound...

servo? spring return on the back remains in same position on or off ch/dhw

dhw/ch on. actuating arm moves outwards (right) clears both micro switches

ch/dhw off. actuating arm is at rest leftwards top switch is adjusted not to engage, bottom switch is engaged

Hi guys, hey Simmo I've got the exact same problem you describe on the same Valiant Combi (hot water but no CH) and minor leaking from the pressure relief valve. How did you resolve yours? what repairs or replacements were required? cheers