Recent content by ukraider

gas pressure governor replaced and boiler now fires up. So far so good, HW and CH working. thanks to all who helped out with advise.

Not wasting time, advice very much appreciated bleed screw fine air vent replaced miscroswitches working pressure increased.......still no joy all advicse carried out prior to identifiing the gas governor as problem.

finally got soemone to look at it, reckons the gas pressure governor has gone so it will need replacing.

Thanks will get some one to carry out instructions will let you know.

will have a try at checking for 20vdc againa dnsee what we can come up with. will let you know.

Its been tested with a multimeter and appears to be there, how else wopuld you test for it. In the manual the fault finder says if it is available then replace to gas operator. If it is there what problem would it cause where you have to replave the operator. if is isn't what is that problem?

yes fellas all those have been checked and me and my bro in law are also stumped.

have checked the servo valve that appears to be working ok

Yes got the original

Pump is ok have already tired that.

Chris, have checked fuse - ok continuity of the overheat stat - ok microswitches are working ok the pump is running ok (how would you bleed it if necessary) It's a balanced flue variety, yes - ie big squarish flue through the wall and no fan? yes

Yep have tried running HW and tried running CH still nothing.

Yep filled it to its current level 1 bar and still won't fire up.

Kevplumb, the system pressure is 1 bar, when the boiler stopped firing up the pressure had dropped from 1 bar to 1/2 a bar. ukraider

Hi I have a Vaillant vcw gb 221h combi boiler. After flushing out and refilling, the system worked fine for about 2 hrs firing up giving hot water and central heating. then it stopped firing up. Seems to make all the right noises prior to it firing up just doesn't. Currently have no HW or CH...