Thanks for the reply. The ch side is ok but the domestic hot water runs hot then cool. i had read various sites that suggested the diaphragm might well be the cause and removing the diverter valve looks reasonable.
since it is either mend it or scrap it a shot seemed worthwhile.
while i am at...
Hi. I have a vaillant vcw gb 221 h and need a diaphram plus associated new washers required on the repair. could anyone please give a supplier name who is reliable and reasonable? When replacing the diverter valve after the repair would you use tape on the unions or a sealant and if sealent...
