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SUCCESS!!!!! I eventually found a recommended plumber prepared to take on the job of replacing all the manifolds & making good the tails. He pressurised to 1.2bar, & 60 hours later, it's still at 1.2bar! Thanks so much for the advice you've given me over many months. I'm very grateful...

There's no more than a litre in the manifold sump, so it's more of a weep than a leak there. I've been away for 2 weeks and the upstairs rads were half empty, even at zero pressure. It took 5 minutes to top up. On a daily basis, it will drop from 1.7 bar to .5 bar in 6 hours. The plumber who...

Hi Terry, Just an update to say I'm still in the same position I was a few months ago ie topping up pressure every few hours. It seems plumbers around here are only interested in 30 minute boiler services for £70. One guy suggested writing off the downstairs microbore & replumbing with 15mm...

Yep. It’s all 40 years old. The other manifold is underneath and the phone camera only autofocusses on the top one. I agree about fixing the visible leaks and see if I still lose pressure. I’ll update you after I’ve had it done. ✔️

Hi Terry. 3 photos attached. 2 manifolds with 6 microbore pipes attached to each. I have 7 downstairs radiators so perhaps 1 nearby radiator is connected elsewhere. The plan is to get a reliable plumber to fit new manifolds and new connections to the pipes running to the radiators. The 2...

Leaks are from the olive/nut interface to the manifold. Nothing from the copper/plastic piping. I’ll take a photo tomorrow as it’s POETS day and old habits die hard!

Thanks Terry. I have 6 downstairs radiators fed by micro bore copper pipe running in plastic pipes under concrete. It’s quite a large house and converting to 15mm above ground would be very messy and expensive. Built 40 years ago. I’ve just checked the chamber where the 2 manifolds are sited...

Hi Terry, Happy New Year to you. Another Bosch Worcester engineer has just visited, pressurised to 2 bar, isolated the boiler via inlet & outlet valves, left it 50 minutes & it hadn't lost pressure. When he opened the valve, I saw the pressure drop considerably, thus proving the leak has been on...

The WB engineer replaced the heat exchanger, but didn’t find evidence of a leak from it. I’m not sure if the expansion vessel was replaced. Anyway, it’s still losing pressure, although a little slower. I’ll ring them tomorrow and see what they say, after I’ve checked for leaking from the...

Worcester Bosch are sending an engineer out. I’ll keep you posted.

It was a BOXT installation and I have his details. Is that the place to start?

It was commissioned on 21 Oct 22 and serviced on 9 Feb 24. Losing pressure since winter 23 and i can get a GSR to confirm. Slightly over the service schedule, so are they going to play nice, in your experience?

Hi Terry. I'm now having to repressurise every 5 or 6 hours to keep my heating working. I've just gone up some steps where the condensate drain goes into a gutter. Tapping the pipe produces about 8 or 10 drips of water. I've pressurised the boiler to 1.8 bar, left it 10 minutes and it again...

Yes, I've already tried that. See about 6 posts back. I take your point about an internal pipe leak check and will report back next week. Have a great weekend.

Thanks Terry. I need to find time to shin up a ladder, disconnect the condensate drain pipe when cold & see if there's a small but steady flow. Nothing is coming from the PRV pipework. As I have to repressurise every 6 hours or so, it has to be going somewhere.

Thanks Terry. Understood. Guess I can pull the pipe apart to check how long it drips for. Did the isolated boiler dropping from 1.6 bar to zero not tell us anything?

Hi Terry. I closed off the extreme right & left valves after pressurising the totally cold system to 1.6bar. I came home after 40 hours to find the boiler pressure at zero and a water drip from the horizontal drain pipe at a joint indicating water had flowed along it. When I opened the...

Thanks again, Terry. Heating had been off for 4 hours with only the odd burst for hot water. I'm away on Saturday for 2 nights so I'll repeat the process over 40 hours and report back.