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further to the above the domestic hot water heat exchanger has now been replaced to try to cure a new fault which has developed ,whats happening now is a loss of system pressure when hot water is called for as above a new diverter valve was fitted a few days ago and a new DHW heat exchanger...

hi tony thank you for your reply ,the diverter valve was replaced yesterday ,the boiler is used in a mid sized health spa and is filling baths 7 days a week 12 -14 hours per day it does alot of work. but is serviced regularly,i have called the vaillant technical help line who now suggest...

HI all i have a vaillant turbo max VUW 242 E ,date of manufacture is 1998 ,it is being used in a commercial premises and is subject to very high hot water demand.and small heating load of six small rads it is serviced religiously . i have found that diverter valves are only lasting 9...