Hi all,
after just fixing my worcester 280 which suffered an expansion vessel failure and pressure relief valve failure, I am aghast to have discovered I have similar issues with my worcester 24i LPG. this is the non greenstar variant (standard boiler, non-condensing). I will give a run down of what happened.
Firstly, someone (previous owner) had, for some reason, switched the bosch system pump onto its lowest setting. Unfortunately, this wasnt enough for the boiler CH loop. It required setting III.
The boiler lit, as normal, and as this was the first time it was lit, I kept an eye on it for a minute or two. Unfortunately, the pressure starting climbing. When it hit 3 bar, I thought, enough is enough. unfortunately, I was too late.
I heard a hissing sound, which I originally thought was steam outgassing via the PRV. unfortunately, it was the expansion chamber rubber going, and the pressure vessel pressure leaking out of the back of the pump inlet.
I had switched off the demand as soon as I realised what was happening (about 2 seconds later). The system cooled and I went to take a look. The concerning thing was this. even though the system was pressurised to 2 bar, operating the PRV knob didnt dump the pressure. Not even a little bit. Which is a bit of a worry.
Problems I now have, the pump is dripping very slightly at the inlet. I am hoping this is simply a blown O ring (is this likely, or will it be more serious?), rather than anything more serious with the pump. I know the expansion vessel is gone, so will need replacing.
As to the PRV, I am unsure as to whether the PRV is at fault or whether there is a blockage in the pipework. Until I get it off and get to test the PRV and the pipework downstream of the PRV I wont know.
Does anyone know how easy it is to get to the expansion vessel on these? at first glance, it appears to be a complete and utter ballache, hidden behind the boiler casing. Any top tips as to how to get to it? The 280 was an absolute dream to fix, obviously worcester clocked that it was too easy, when they designed the 24i .
after just fixing my worcester 280 which suffered an expansion vessel failure and pressure relief valve failure, I am aghast to have discovered I have similar issues with my worcester 24i LPG. this is the non greenstar variant (standard boiler, non-condensing). I will give a run down of what happened.
Firstly, someone (previous owner) had, for some reason, switched the bosch system pump onto its lowest setting. Unfortunately, this wasnt enough for the boiler CH loop. It required setting III.
The boiler lit, as normal, and as this was the first time it was lit, I kept an eye on it for a minute or two. Unfortunately, the pressure starting climbing. When it hit 3 bar, I thought, enough is enough. unfortunately, I was too late.
I heard a hissing sound, which I originally thought was steam outgassing via the PRV. unfortunately, it was the expansion chamber rubber going, and the pressure vessel pressure leaking out of the back of the pump inlet.
I had switched off the demand as soon as I realised what was happening (about 2 seconds later). The system cooled and I went to take a look. The concerning thing was this. even though the system was pressurised to 2 bar, operating the PRV knob didnt dump the pressure. Not even a little bit. Which is a bit of a worry.
Problems I now have, the pump is dripping very slightly at the inlet. I am hoping this is simply a blown O ring (is this likely, or will it be more serious?), rather than anything more serious with the pump. I know the expansion vessel is gone, so will need replacing.
As to the PRV, I am unsure as to whether the PRV is at fault or whether there is a blockage in the pipework. Until I get it off and get to test the PRV and the pipework downstream of the PRV I wont know.
Does anyone know how easy it is to get to the expansion vessel on these? at first glance, it appears to be a complete and utter ballache, hidden behind the boiler casing. Any top tips as to how to get to it? The 280 was an absolute dream to fix, obviously worcester clocked that it was too easy, when they designed the 24i .