Hi folks
(Combi is a 17/18 year old Vokera Linea+)
I posted before about this and I admit I should've got on with investigating it better but I've been nursing the boiler along topping it up. It's losing a bit more again now, I'd say it'd drop 1 bar in about 4 days. It'd drop from 1.5-2 bar to zero in under a week. I ideally want to move the boiler before long which has to be done along with other alterations. So I ideally don't want to replace it now and I certainly don't want to if my leak is on CH side. Theres a flat below mine but no obvious signs of a leak anywhere.
History to this is
1. A few years ago an engineer claimed to see there was pin hole leak at main heat exchanger
2. A year or so ago another engineer serviced the boiler and thought heat exchanger seemed fine
3. At the same time (year or so) the engineer replaced the PRV and checked expansion vessel
(my pressure gauge isn't ever going up). I think we put stop leak into the system. It was miles better for a while.
I've a feeling there maybe is an underfloor leak somewhere but would like to be sure hence (as I think was suggested here) isolating the heating system side for a few days.
See pic. I'm posting because an engineer I spoke to yesterday didn't seem sure whether it was necessary to loop to flow and return together or whether you can just shut off valves. I bought two 22mm isolating valves* on the assumption they could maybe just be fitted into the flow/return pipes. I had someone here to look at it on Thursday who seemed to think it was the expansion vessel but he came without a pump then didn't return on Friday.
(*I believe not a good idea to touch the old valves as per pic)
Probably then get someone new this week, but I'd quite like to be able to say what I'd like done to isolate the heating. What would be best? Thanks
(Combi is a 17/18 year old Vokera Linea+)
I posted before about this and I admit I should've got on with investigating it better but I've been nursing the boiler along topping it up. It's losing a bit more again now, I'd say it'd drop 1 bar in about 4 days. It'd drop from 1.5-2 bar to zero in under a week. I ideally want to move the boiler before long which has to be done along with other alterations. So I ideally don't want to replace it now and I certainly don't want to if my leak is on CH side. Theres a flat below mine but no obvious signs of a leak anywhere.
History to this is
1. A few years ago an engineer claimed to see there was pin hole leak at main heat exchanger
2. A year or so ago another engineer serviced the boiler and thought heat exchanger seemed fine
3. At the same time (year or so) the engineer replaced the PRV and checked expansion vessel
(my pressure gauge isn't ever going up). I think we put stop leak into the system. It was miles better for a while.
I've a feeling there maybe is an underfloor leak somewhere but would like to be sure hence (as I think was suggested here) isolating the heating system side for a few days.
See pic. I'm posting because an engineer I spoke to yesterday didn't seem sure whether it was necessary to loop to flow and return together or whether you can just shut off valves. I bought two 22mm isolating valves* on the assumption they could maybe just be fitted into the flow/return pipes. I had someone here to look at it on Thursday who seemed to think it was the expansion vessel but he came without a pump then didn't return on Friday.
(*I believe not a good idea to touch the old valves as per pic)
Probably then get someone new this week, but I'd quite like to be able to say what I'd like done to isolate the heating. What would be best? Thanks