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Thank you all for your replies to our problem. We had a qualified unvented systems plumber in yesterday who did a full investigation of our system & checked all the valves. He's figured out that it's the first valve we replaced, the 'expansion relief valve' that's gone again & he's going...

Also, is there anyway we can test to see if it is the 3 bar pressure reducing valve that's faulty. they've changed the part a bit from the original one which is going to require some changes to the pipework in order to get it fitted. I would hate to go to all that expense if it's not going to...

okay - sorry, I misunderstood earlier (as I said I'm not technically minded about this, I only learnt the term 'pressure reducing valve' 6 weeks ago...) No, we haven't replaced the 3 bar pressure reducing valve. We've only replaced the Expansion relief valve (6 bar) & the Temp & Pressure...

Would there be something causing the valve to fail? We only replaced this about 4 - 6 weeks ago, so I guess there must be something causing them to continually fail. Would there be too much pressure in the system?

Thanks for your reply. Yes it was, we got a like for like replacement & checked the pressure with a foot pump.

We're really confused by this problem: We have a Tribune HE unvented system which is roughly 3 years old. A while ago we noticed cold water dripping through the tundish. We replaced the Pressure relief valve & that temporarily cured the problem. Then within a week or so, we noticed hot water...