On Wed, 04 Apr 2007 01:19:10 -0700, iceland_potter wrote:

my Ravenheat Combi boiler had a problem recently where it was on zero
pressure, so I turned a plastic tap underneath which was connected to
a felxible pipe, which seemed to let more water into the boiler.

The radiators now all work full heat, but the hot water isn't very
hot, and the hot water isn't hot at all when the switch is switched
from central heating and hot water to just hot water. I've tried
varying settings on both thermostats.

It seems like something's wrong as the boiler used to be fine to pump
out hot water when the switch is just set to hot water.

Pressure is about 0.8 bar cold and i'm not sure what it is when hot
but its over 1 bar.

Has anyone got any ideas please before I call out a plumber?

Many thanks.

It's very likely the diverter valve. Switch the CH off, run a hW tap,
if the boiler fires and the CH flow pipe gets hot the that's really all
the proof you need.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards