On Sun, 29 Jan 2006 11:47:11 -0800, chrishob wrote:


HELP!!!!!!!!!!!!!!!

I have fitted a combi condensing boiler,i have all the connections
fitted as per installation manual.i have filled the central
heating(which is actually just 1 rad at the moment)with the filling
loop till the guage read 1.5bar.

The combi boiler has a switch to select DHW or DHW/Central heating.

The problem is when i try to pull hot water from my taps,the burner
lights and burns for approx 10-15 secs,the pressure guage rises to
approx 3-4 bar and a small relief valve on the top of the boiler
discharges hot steam.

There is no hot water from the taps.

I am sure everything is connected as it should be,Please help.


I don't think this is the main flow/return isolators as
1) This happens in DHW and
2) The symptoms are too extreme.

I'd go for checking that the pump is operating and that it has been bled.
Clearly the auto air vent is working.

Make and model might help a bit too.


--
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