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Thanks to all who replied. You were all wrong unfortunately. Do you know what it was? Well the plumber who serviced the boiler in mid August also emptied the Magnaclean cartridge which is located under the boiler. But apparently the dozey f***wit forgot to reopen the valve back into the...

Thanks Tony.I guess it's just taking out 4 screws and not touching anything so should be OK. I just don't understand that if the HW and CH are both powered by a pump in the Greenstar 30si then how can the HW be working and not the CH.Or am I missing the point?

Should I be taking the cover off the boiler to check these things?I don't want to mess around with it in case I lose the HW too or invalidate the guarantee.

The hot water is filling the CH pipes though, they just aren't in turn filling the rads.

Yes Mick - all the rads are on

Kev - if the CH runs off the pump too and is working OK do I need to bleed it?

Just thought I'd check for a quick fix for my prob before I call WB. We have no CH. When it is turned on the boiler fires up (and I presume the pump) for about 20 secs, with the green 'flame' light on. After this 20 secs, the light goes off but the pipe to the radiators is hot and you can...