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Well so much for the "update over the next couple of days" - my daughter's had chicken pox and boiler maintenance got put on hold!! Anyway, I ordered a new PRV from the link that Chris kindly provided and managed to replace the old one. It's been in for almost a week now and the pressure...

Thanks guys. I reckon the PRV diagnosis is my first port of call. When the HW/CH is on the pressure stays around the 1 bar mark. Once they're both off however it drops to almost zero. My radiators also needed bleeding again so there's definitely some air getting into the system. I'm going...

Many thanks all for such a quick response. Ollski - I am still getting HW/CH but the gauge does go up and now doesn't drop immediately to zero like it was yesterday. ChrisR - thanks for the correct pressure advice. Cmyers_uk - Thanks for all the details. I've checked outside and my...

Advance apologies for the long post but I thought it best to try and give you as much background as possible. I have a Worcester 280 gas combi boiler which was already in the house I moved into approx 18 months ago. I'd been experiencing problems with the boiler cutting out when using HW and...