not getting hot water when turning the tap on, sometimes the tap has to be turned on full then the combi boiler clicks and in a few minutes the hot water is on, other times it does not work at all so I get cold water. The heating system is ok.

raj mistry, January 2007

Microswitch just done one

becks, October 2009

I think the problem could be with the small differential pressure valve at the front of the boiler above the solenoid. Remove it gently be unscrewing its three holding screws and pull it forward with the small bore water pipes still in place. When you turn on the hot water the valve should operate smoothly.
This can be observed by watching the plunger. It should return when water goes off. approx 27 quid.

Keith, March 2008

More than likely to be the diaphram in the H/W housing in the boiler.
Please use C.O.R.G.I registered engineers for this kind of work on gas appliances.
A vintage boiler like the sine can take your head clen off, if not treated with respect.
Hope this helps.

Christian., January 2007

poss dhw flow sensor

hi-spec plumbing, January 2007