Worcester Greenstar 30Si

[OwenoWent]

Hi.

Ive been very lucky that I haven't needed to turn my heating on yet, my new house seems to be better insulated than I thought.

A colleague advised me that I should fire up the system to make sure everything works before a real cold snap hits.

I did that a few weeks back, and everything seemed ok - all rads warming evenly and quickly. I turned the heating on again last night, and some of the rads seemed patchy. I decided the bleed all of them and I seemed to let an awful lot of air out of the system - much more than I'm used to doing. I thought nothing of it, turned the heating off and went for bed.

I thought I'd test the system again this morning, most of the rads warmed quickly and evenly, but 2 were very slow to warm and didn't seem to get as hot as the others. I checked the pressure gauge and it's a flat 0BAR!! Could this explain why some of the rads are so slow to warm?

I've added water to CH systems before but never on this boiler. It's a Worcester Greenstar 30Si COMBI Mk IV. The last time I did it there was a key and bolt style valve, but my boiler doesn't seen to have one of these. Any suggestions would be greatly appreciated. I've tried to post a link to a picture of the underside of my boiler, but it doesn't seems like I'm allowed to do that.

Thanks

Owen

 

[bewsh]

If you bled the radiators, the pressure will drop.

If you havent got the integral filling loop - the one with the key, then there will be an external one somewhere. A braided hose connected to a non return valve and an isolation valve, between the cold water pipe and a heating pipe. Usually below the boiler, but I've found them in some ridiculous places at times.

 

[OwenoWent]

Thanks, Bewsh.

I've managed to sort it now. We searched high and low and still couldn't find an external filling hose. I've taken bath panels off, backs off kitchen cabinets and pulled the Rockwool up to expose the pipe-work in the loft, all to no avail.

I managed to refill the system by running a hose between a drain cock on my mains water supply and another drain cock on the heating circuit. Secured in place by jubilee clips. It was far from ideal, but got the job done without springing too many leaks.

I'm going to start a loft conversion soon, so when I get a plumber in to fit a bathroom and some rads, I'll get him to fit an external loop next to the boiler - makes sense as the system will need to be drained anyway.

Thanks again for your advice.

Owen