Only pilot light on / old rads

[zimmer]

Hi,

I have just had to bleed the CH system to do some maintenance on a radiator, did the work and re-filled the CH system but although the pilot light is on it won’t “fire-up” (Gloworm) what ever I do ( twiddle the Min=Max knob) , nothing more that the Pilot light is on? Occasionally, it does fire-up but only for a minute or two the back to the Pilotlight . I have manually tripped the room thermostat over to max and still nothing?

All the radiators are cold except for the bathroom where this is quite hot?. The pump seems ok ???
The mechanical switch which controls the flow between CH system & hot water seems to change ( Up & Down) depending upon which I select .

Any suggestions as it was working ok before I did my bit of fiddling!



Thanks: Zimmer

 

[chrishutt]

Air lock. Zillions of threads on this. Do a search.