Search results

mr.V the valve only moves out for CH, not DHW. The cam moves for DHW, and I get hot water. L checked that the servo is working correctly by blowing down the pipes and I am fairly sure that it is right, judging by the clean pattern on the ceramic plate inside, it is assembled ok. I don't...

Thanks - that's how they are, but the diverter still moves right. just found that the DHW is fine, but no CH at all - because the diverter goes right, there is no flow around the rads, if i force the valve left (v difficult) all is ok. there must be a crossed hydraulic somewhere elstime to...

Thanks for the replies - the white tag is on the top one still. The crud was more like rust deposits, cleaned out easily. Still wondering if I put that back right. Oh well, more experiments called for before buying a new servo valve - plus a call to Vaillant on Monday!

I have recently had to replace the diaphragm on both the water valve and diverter valve on my boiler. I'm fairly sure I got all the servo lines back where they should go, but now the diverter moves to the right when there is CH demand - i.e. the wrong way! With no CH demand, the valve is...