"Stuart Black" wrote in
:


The boiler is definately working as is the pump. In fact they are
working overtime as the water in the cylinder never gets warm enough
to switch them off !

Any ideas what else i should look at ?


As there's no takers I'll have another go.

As your boiler and pump are running the heat must be going somewhere; I
have to assume it's into the heating, if not there should have been an
explosion as all your safety cutouts have failed.

It may be that your 3 port valve has failed actually in the valve,
rather than the actuator - I'm told this is pretty rare, but if you
disturbed a piece of crud....

You may be able to remove the top bit of the valve (the electrics) and
see if you can move the actual stem with a wrench. With older valves you
can't do this.

Putting it into "mamual" should have done this if the brass bit of the
valve is working.

If your pump and boiler is working, and neither the rads or hot water
are heating up, I should evecuate the area.

HTH

mike