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Revenheat RSF820 Boiler Problem?

Hi

I recently moved into my new house. There is a Revenheat RSF820 boiler installed in the house. The Problem is when I open a hot water tap, the hot water also goes to the readiators even when the heating is off and all radiators in the house warm up. I have tried to switch tap/heating nob to tap water only but no difference.

This is really bugging me becasue whenever I open a tap, there is no hot water as all the hot water goes to radiators first.

I would really appreciate any help/advice on this.

Many Thanks.
M M Gulzar, February 2010
Thanks Hudds Gas

So that means I 'll have to call out a plumber :(:(:(

M M Gulzar, February 2010
sounds like the diaphram on the divertor valve has gone. not really a DIY job as usually means taking a few parts out of the boiler, and can be tricky sometimes.
what is happening is the divertor vavle is stuck in the central heating position and when you open a tap it fires the boiler but it send the water round the heating side rather than the hot water heat exchanger.

hudds gas, February 2010
link Click here to see other fixes for Revenheat RSF820.