Boiler problem

11 Sep 2004
Reaction score
United Kingdom
My local water authority turned the water off to the whole estate the other week. Since then it is hit and miss as to whether the boiler is going to deliver hot water. If the heating is turned on it delivers hot water all the time, but only warm when it is turned off.

The boiler is a Ravenheat RSF 84 E.

It was fitted in April 2002 and since then has had a new air pressure switch fitted in Sept 2003.

Any ideas guys.

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The only relevance to the water board is if there is insuficient flow of hot water, caused by blockage with debris following whatever it was turned it off for.

Most boilers should heat water at flow rate as low as 2 litres a minute, I think you would have mentioned if water just dribbled out of the taps.

Therefore you are looking for another cause.

Such as faulty thermister diaphragm or diverter valve, unless it is equally underperforming on heating but you can't detect the change in which case you may well be looking at another aps fan almost anything

You probably need to get someone to come and have a loook :eek:
thermister diaphragm or diverter valve
Definitely something to focus on in the first instance.
Thermistors go often on these and often worth changing as a matter of course.
A DV is a very likely cause
If there happens to be a neat slit in the diaphragm or debris in that water section complain to the waterboard. I was told the following coincidentally on the Ravenheat training course:- A change in practice now means that they no longer flush the main after a burst which could have resulted in debris damaging the diaphragm. The implication that you have good pressure makes this more of a possibility

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