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- 10
This is a weird one, for sure... I had an old Vaillant combi replaced by a new Worcester Greenstar 4000 by Boxt.
It was as simple a job as you can imagine - direct replacement... my house is a simple 2 up 2 down semi - nothing remotely complicated.
However for the last two months since it was done, I've been getting small amounts of bubbles ending up in one of the upstairs radiators. It's worst after the heating has been off over night but also get some bubbles during the course of the heating being on too. Pretty certain it no longer could be residential air from the replacement job.
The Boxt engineers have been back three times, and they've bled the radiators and added some sealant but they are at a loss. as to what it is - it's also not frequent enough to be easy to see it happening when someone is only here for a few minutes.
I'm pretty certain there are no leaks and the pressure is not dropping - it is about 1.1 bar cool and goes up to about 1.4 bar hot.
I'm aware that gas can be hydrogen, the result of oxidisation, but I doubt that - it doesn't burn when I bleed the rad and it didn't happen before the replacement, although this new boiler definitely runs hotter than the old one.
I've tried opening and closing the automatic air vent at the top of the expansion vessel - no difference.
All I can think is that there is something wrong with the new Combi itself that is somehow sucking a little bit of air into the pressurised system
Are there any experts who can help me - at least tell me what I should tell Worcester so that I can get them to fix it - I doubt they'll come out unless I can be a bit more sure it is the boiler.
Very much appreciated!
It was as simple a job as you can imagine - direct replacement... my house is a simple 2 up 2 down semi - nothing remotely complicated.
However for the last two months since it was done, I've been getting small amounts of bubbles ending up in one of the upstairs radiators. It's worst after the heating has been off over night but also get some bubbles during the course of the heating being on too. Pretty certain it no longer could be residential air from the replacement job.
The Boxt engineers have been back three times, and they've bled the radiators and added some sealant but they are at a loss. as to what it is - it's also not frequent enough to be easy to see it happening when someone is only here for a few minutes.
I'm pretty certain there are no leaks and the pressure is not dropping - it is about 1.1 bar cool and goes up to about 1.4 bar hot.
I'm aware that gas can be hydrogen, the result of oxidisation, but I doubt that - it doesn't burn when I bleed the rad and it didn't happen before the replacement, although this new boiler definitely runs hotter than the old one.
I've tried opening and closing the automatic air vent at the top of the expansion vessel - no difference.
All I can think is that there is something wrong with the new Combi itself that is somehow sucking a little bit of air into the pressurised system
Are there any experts who can help me - at least tell me what I should tell Worcester so that I can get them to fix it - I doubt they'll come out unless I can be a bit more sure it is the boiler.
Very much appreciated!
