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Vaillant Sine 18 T3 W - No hot water, CH ok?

I have a Vaillant Sine 18 T3 W. The boiler won't fire up when hot water tap is opened. Pressure OK, in fact since this happened the pressure at the tap has increased. CH is OK.

Can anybody point me in the right direction as to what it might be?

KenD, January 2011

home Fix label Heating label_important Home Heating Systems category Vaillantdone

Hi Carefree.

Replaced the whole unit instead of replacing the diapham & stuffing gland. Everthing OK now.
Will repair the faulty one and keep it as a spare.

Many thanks for your help.

KenD

KenD, February 2011

Many thanks carefree for your valued help. I realised were it was after I put the question.

It's a shame Bill couldn't be as helpful.

KenD

KenD, January 2011

KenD
Underneath the boiler, central, toward the front, a silver valve with 4 water connections going to/coming from it.
The page I posted for Bill (who thought I was joking for some reason)? Has a picture of the valve, 4th item down (stuffing box shown too).

Carefree, January 2011

Why having a laugh Bill?
Laugh at this!

http://www.directheatingsupplies.co.uk/boilers/boilerspareparts/vaillantspareparts/?page=8

1st item

Carefree, January 2011

Thanks for the quick response

Just to be sure wear is it located.

KenD

KenD, January 2011

I think someone is having a laugh!!! Stuffing box????

bill, January 2011

Domestic diaphragm in the water section.
Worth replacing the stuffing box (often leaks too) on top of the water section too at the same time.

Carefree, January 2011

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