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I've got a Worcester bosch greenstar 30si boiler. For the last 2 mornings a couple of the radiators have been warm(not hot) when the thermostat is turned to zero. Coincidentally the shower was used twice about half an hour before I noticed the warm radiators. Also the flow turned adaptor behind...

It's fixed. Heat sensor apparently. Thanks for the suggestions.

Thanks alicorgon, I'll mention that tomorrow when he comes back.

He hasn't charged me for the pump or expansion vessel, he changed them back over when he realised they made no difference. He now thinks maybe it's the heat sensor?

And the saga goes on.....plumber has finished flushing the system and changed the diverter valve. There is hot water back to the boiler now. But the system cuts out still at two bar??? Anyone got any more ideas????

I don't think he has checked the diverter valve compheat. I noticed yesterday while he was running the boiler again, the radiators were getting warm??

Changed the pump. Still the same. So he's powerflushing the system another day as the return pipe back to the boiler was still stone cold. Any thoughts?

The plumber says he phoned Worcester up and they reckon it's the pump?? I'll post the outcome when it's fixed.

Does anyone reckon it could be the heat exchanger??

Boiler was installed just over two and a half years ago.... And no it doesn't do it on the hot water??

It doesn't lockout. The pressure drops eventually and the heating starts again?

Thanks compheat, The pressure gauge is at one bar, as you said. When I put the heating on it runs ok for awhile, with a slight slow increase in pressure. Then all of a sudden it rises quickly (about 10secs) to 2 bar. Then goes off, the pointer on the gauge flickers/jumps a couple of times...

I have a problem with a worcester bosch 30si boiler. When i put the central heating on, it comes on ok for about 4 mins, then it starts running faster and the pressure dial rises rapidly from 1 bar to 2 bar and then gets louder and cuts out. The green flame indicator is off and the pump and fan...

Has anyone else got any ideas please??

why should I need to do that, I didn't a month ago. What has changed?

Could anybody help me I had a worcester greenstar 30si combi boiler fitted oct 09. Its been fine up until approx 3 weeks ago. When the hot water is run, either for a bath or washing up. Its cool enough to sit in straight away. You don't need to add cold water. The dial is turned to max. This...

I got the choice of a Worster bosch 30si or a 30cdi. I got 11 radiators over a four bedroom house and one bathroom, but hopefully put an on-suite in a bedroom. Will the 30si be ok?? Thanks, Banjo13.

Potterton Puma 80e, About 15 years old.

we only have the one shower. Possibly add another in future.

could anyone recommend a a decent combi boiler for a house with 10 radiators over ground and first floor. thanks.