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Not sure what kind of information that you need. Have booked engineer to come tomorrow, will mention the above possibilties and see if these are ok.Thanks for the info.

Hi Had the above boiler fitted two and a half years ago. has worked fine until yesterday. Yesterday evening the boiler refused to fire up. Without heating last night and this morning. Now it has suddenly started working, though I think there is a slight bubbling sound coming from the boiler...

Yes. This started after new boiler was fitted.

I would like some advice please. Used to have an old gravity hot water/pumped central heating system, which was changed to a Vaillant ecoTec 624 with a hot water cylinder last October. Switched off the heating and and left HW on , but radiators continue to heat up. Called plumber back and he...

The new boiler replaced an old gravity fed system.

I have recently had a new Vaillant ecoTEC boiler installed. All radiators upstairs are heating up o.k. Downstairs, the radiators take 2 hours to heat up. Even the radiator downstairs without TRV takes 2 hours. What is happening?