vaillant diaphram or diverter valve

[volvotrier]

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 then what? Many thanks for all replies.

 

[DP]

My question to you would be- why are you removing the diverter. Do you know what you are doing? This is a complex boiler. Its operation is like none other.

 

[Agile]

And if its the funny mid position thing then they never fail ( although the micros can go out of adjustment ).

Tony

 

[volvotrier]

My question to you would be- why are you removing the diverter. Do you know what you are doing? This is a complex boiler. Its operation is like none other.

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 it do you suggest any special spray for electrical parts/ any tips would be gratefully received.

 

[nicknox]

Don't confuse the 'diverter valve' with the 'servo valve' which is operated by the mains water. But it does sound like the domestic HW heat exchanger is becoming blocked.