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I will repeat the test at 2.5bar and see what happens. If the heat exchanger is the unit on the left of the boiler, about the size of half an A4 sheet of paper then that was changed about 9 months ago.

Thanks ChrisR, do you think the overheating issue is linked or a seperate problem ?

Thanks Chris for your reply, I will pop a call into BG now we have pretty much isolated the cause to the boiler. If it is the expansion vessel at fault, where does the water go to the was used to pressurise the system? Now you mention it, it is puzzling that the pressure did not rise slightly...

An update for you guys. I had the CH isolation valves closed all day yesterday and overnight and pressurised the system to 1bar, I know it should have been 2bar, the system has dropped to .5 bar overnight. I opened the CH isolation valves again this morning, pressure stayed stable at .5 bar...

Thanks Chris, I have done as you have said. Switched the central heating off, pressurised the system (1 bar, should I go to 2) and isolated the pipework. I will watch overnight and see if the pressure drops, if it does, then I presume boiler leak somewhere, if it does not, then pipework leak...

Yes, 100% sure. We had it leaking several years ago, BG came, put on a new PRV and had to replace the copper pipe going through the way and it wasn't in the correct position for the new PRV.

Tony, I have put a finger from a rubber glove over the PRV last week and left it for 4 days, no water. I have spoken to BG about this on numerous times on the telephone and when an engineer has been onsite to look at other issues and they say they cannot do anything until there is evidence of...

Chris, thanks for the info. I agree on you with the "air" collecting, and i understand that air being vented off will result in the pressure dropping, but where is all the water going to that I use to keep topping the system back up. The heating system has not been on for the last 4 months as...

The boiler is a Vaillant VCW 242E.

I have repressurised the system to 1 bar and have isolated the CH feed and return pipes underneath the boiler. So my understanding now is that if the pressure drops now, the leak is inside the boiler. If the pressure stays stable, then the leak is in the heating pipework, am I correct...

I have checked inside the combustion chamber this morning, some signs of green build up in their, but not much. It has dropped by 1 bar overnight, would I see water still in their or not ? I didn't think about isolating the heating pipes, will do that now.

I have removed all the plastic covers from the rads, they are all clean. I have also remoted the thermo valve top and they are clean too. I have taken the side covers off the boiler and had a good look inside and it is very clean, so I do not believe it is the boiler. How much water is...

I have checked that on previous occassions, it is clean, so is the overflow exiting the house.

Hello all, I have posted several messages on this forum about the pressure loss in our boiler. The loss is now getting far worse (1bar in 2 days), so it is now time to source the leak. It is not on any of the radiators, they are all clean and dry. The boiler itself is clean, dry and no...

Would air getting into the system or hydrogen being produced in the system by corrision cause the pressure to drop on the boiler ? We have the system drained and refilled about a year ago as we had the upstair rads changed, corrosion inhibitor was put in at that time, but I think as I am...

Just another clue that might help, we get a lot of air into the system upstairs, mainly in the towel radiators in the bathrooms. Not sure if that helps anyone, but thought I would throw it in anyway.

Anyone else with any ideas before I put a call into British Gas and get them to rip the house apart :shock:

I have taken the rad controls off and had a good look at the valves themselves and they all look ok, the only one that has leaked in the past is the one if the downstairs toilet, it is a but furry looking, but it is dry. I have added some leak sealer to the system myself, Fernox Leak Sealer, but...

Thanks for the replies guys. We live in Lincolnshire. We have British Gas cover on the boiler, so maybe we need to call them out to it, I am just a bit worried that the leak may be underneath on of the floors downstair. The heat exchanger was replaced about 9 months ago, I have checked all...

Hello guys, We have a Vaillant VCW242E boiler, about 16 years old I believe. We have had over the last year pressure drops of about 1bar over a period of 1-2 weeks. We have to keep topping the system up. I have also noticed a strange issue over the last couple of months, doesn't happen...