Hi, I have a worcester bosch green star 42CDi and have the same problem. It happened last Christmas, and the kettle did the trick.

Problem is, it's now even colder, and its no longer working! We have a white condensation pipe that comes out the wall (we now have decking, although there is a small gap so can fit hand down where white pipe is - I can post / email picture if this helps!).

It did the gurgling, scary vibrating sound at 4am on Monday morning, and hasn't worked since. I've tried hair dryers on the pipes (boilier is in the garage, which is also cold!), putting a halogen heater by the boiler, and hot towels around pipes.

The pressure (the digital bit) won't go above 10 now - when it works it's in the 60s! and the bar thing reaches 1.

What is this reservoir clip thing? Will I have one? Where is it? Please help! We can't afford a call out, or another night of freezing!

I'll check here, but people can also email me at santa_nethy at hotmail.com

Many Thanks

Catherine COLD COLD COLD!, December 2010

Can't thank you enough, had exactly the same symptoms, undid the dome thing let all the water out, and now the horrible vibration has stopped and we have heat again.

Thankyou.

Philip Grace, December 2010

Me again, I fixed it. Found it on google or one of these forums.

Make sure the white condense pipe defrosted, then underneath the boiler there is a dome shaped thing, which has a clip either side, unclip and tonnes of water pours out (might want to turn boiler off at the plug and have a bucket). This is the reservoir trap - once its empty the boiler will fire back up again. It was heaven!!

Google JennyCide - someobody emailed it me this morning which had the same instructions as above. It's a shame WB don't put more useful information in their brochures!!!

Catherine no longer cold, December 2010