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HI Leila, Any luck - I have the same problem with my Combi. Thanks. John

Hi Oilman, I had another guy come around and look at the boiler - in not so many words he couldn't understand why they had replaced the pressure relief valve as water was already coming out. Anyway - he came around and I told him that the pressure valve on the exapansion vessel leaks...

Thanks again Mike. The expansion vessel is just a big red circular metal drum which looks easy detachable on my system (Grant Combi v90). I will give this a go next. Thanks. John.

Thanks for that. I just checked the valve (like a bicycle pump valve) at the bottom of the expasion vessel by pushing the pin in. Black Water comes out - quite a bit. I guess that means the diaphram needs replacing - is it just a case of going to the boiler shop and asking for a diaphram...

HI again, We had the Engineer around to service the boiler and he called his plumber mate. I told him what you said and he said he thought that what you said was a possibility, but he ended up replacing the blow-out valve. This has not rectified the problem as we again are losing pressure as...

Thanks Mike. I have booked boiler in for a service and hopefully will get this replaced if faulty. Thanks again.

HI Snowsride, I had exactly the same problem. Starts off at 0 and goes up to 1.5 bars on mine now. I topped up until I realised that when heating was raised it shot up to 3.5 bar (tested at 9 bar). Was the problem OILMAN mentioned with the blending valve the problem? Your help would save...