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- 4 Jan 2019
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I have a Kingspan Range Tribune Unvented Hot Water Cylinder (on 3rd floor) with an Ideal Logic 15 Boiler (on ground floor). Whole system is only 4 years old, as is the house. No obvious signs of leaks anywhere. No water coming about
We put the central heating on for the first time since the summer the other week, and when the radiators weren't heating up, I found the pressure gauge at the expansion vessel to be at 0. I topped up the system with water to around 1 bar, bled the radiators and then topped it back up to 1 bar. Within a day or so the pressure is back to 0.
The water pump looked like it may have had a small leak out of one of the isolation valve compression fittings at some point. Took that off, cleaned it all up and refitted it, no leak there. Took the expansion vessel off, made sure the seal was good there, refitted it and re-pressurised it and the system. Again, within a day or so the pressure began to drop.
Last night I thought I need to now do some process of elimination. I took the expansion vessel off again, and pressurised it to 1.5bar off the system. Left it for 45mins and it had held its charge. I then filled the system to 1.5bar. I have the boiler turned off, with valves 1 & 2 closed (red circle - 2x central heating zones), valve 4 closed (blue circle - hot water) and the water pump isolated (by the valve in the orange circle). The pipe labelled 1 comes directly from the expansion vessel and goes to point 2. So I essentially have the system isolated from the expansion vessel to the valves. Since last night the system has lost 0.5bar.
I'm now confused as to what it could be. I haven't checked the pressure of the expansion vessel yet as I just checked the gauge before I left for work, but seems like its the system is losing pressure rather than the vessel. Could it be the PRV for the expansion vessel? The only other thing is at point 1 on the picture the pipe T's off to two other pipes and disappears into the wall, I have no idea where these go.
Any suggestions would be gratefully appreciated
We put the central heating on for the first time since the summer the other week, and when the radiators weren't heating up, I found the pressure gauge at the expansion vessel to be at 0. I topped up the system with water to around 1 bar, bled the radiators and then topped it back up to 1 bar. Within a day or so the pressure is back to 0.
The water pump looked like it may have had a small leak out of one of the isolation valve compression fittings at some point. Took that off, cleaned it all up and refitted it, no leak there. Took the expansion vessel off, made sure the seal was good there, refitted it and re-pressurised it and the system. Again, within a day or so the pressure began to drop.
Last night I thought I need to now do some process of elimination. I took the expansion vessel off again, and pressurised it to 1.5bar off the system. Left it for 45mins and it had held its charge. I then filled the system to 1.5bar. I have the boiler turned off, with valves 1 & 2 closed (red circle - 2x central heating zones), valve 4 closed (blue circle - hot water) and the water pump isolated (by the valve in the orange circle). The pipe labelled 1 comes directly from the expansion vessel and goes to point 2. So I essentially have the system isolated from the expansion vessel to the valves. Since last night the system has lost 0.5bar.
I'm now confused as to what it could be. I haven't checked the pressure of the expansion vessel yet as I just checked the gauge before I left for work, but seems like its the system is losing pressure rather than the vessel. Could it be the PRV for the expansion vessel? The only other thing is at point 1 on the picture the pipe T's off to two other pipes and disappears into the wall, I have no idea where these go.
Any suggestions would be gratefully appreciated