Boiler / Radiator Problem

[scrivomcdivo]

My central heating has been working fine up until today when I returned home from work. Whilst in the kitchen, the boiler fired up as it is supposed to (set on a timer). It began to make some bizarre noises though......like a chugging noise. I looked through the "magic looking hole" and it was lit but then extinguished itself after 20 seconds or so. It then lit again, made a chugging noise and extinguished itself. I've checked the radiators and the two upstairs are working fine, however the one downstairs is cold. The hot water seems to be running fine, but that could just be down to hot water being still in the tank.

Any suggestions? I'm thinking the downstairs radiator needs bleeding as the noises being made by the boiler sound like the water pipe is trying to push out an air lock.

Thanks

 

[twgas]

??????????????boiler?????????????system???????

 

[stevehayes]

how are your upstairs radiators working if the boiler keeps turning itself off ???!!!!!

 

[scrivomcdivo]

That's what I couldn't get my head around. As the boiler only started playing up that same evening, I am assuming there was still hot water in the water tank.

Basically, I have my boiler downstairs and my hot water tank (emergin?) upstairs in the bedroom. My boiler is a Chaffoteaux Challenger 30

http://www.chaffoteaux.co.uk/uploads/img42aee2b655a811.pdf

Also, I've just switched the system back on and noticed a lot of water coming from the overflow pipe from the cold water tank which is in the loft. I am assuming this has something to do with it as this doesn't normally happen

 

[scrivomcdivo]

Any offers?