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Vaillant boiler turbomax VUW 282/1E - increase to pressure !?

Vaillant boiler issue - increase to delivery pressure from pump, this varies in operation - i thought just a problem with HWD exchange so changed but it appears tobe related to maybe divertor valve ?
I have had water depensing down relief for boiler so is it to do with diaphragm ? Can only think thats where mains water would be in contact, other than dhw exchange !

Steve
December 2010
VaillantHeating, Home Heating SystemsBoiler Increase Pressure
your not making a lot of sense what is the starting pressure what does it end up at does it increase slowly or very fast when does water escape from the pressure relief valve all the time or when the boiler is on ???

brian
December 2010

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