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Post by aj on Dec 5, 2016 15:56:55 GMT
hi.boiler pressure keeps dropping getting low on combi boiler. I have been around the house checked all rad valves and visible pipes, no leaks that i can see. any idea what it could be? any way to find out what it is?
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Post by tomplum on Dec 5, 2016 17:14:50 GMT
have you checked the blow off ? tie a plastic bag round it, if there's water in it when the pressure has gone, thats where its going,
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Post by endfeed on Dec 5, 2016 17:23:31 GMT
Hi aj,could be the expansion vessel.you can test by pressing the shrader valve(looks like a bike valve) if you get water when pressing it that will be faulty and need replacing.can also be leaks on pipe work under ground or suspended floor.
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Post by endfeed on Dec 5, 2016 17:25:11 GMT
have you checked the blow off ? tie a plastic bag round it, if there's water in it when the pressure has gone, thats where its going, |
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Post by endfeed on Dec 5, 2016 17:26:04 GMT
My dad had that prob on his tom👍
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Post by aj on Dec 5, 2016 18:39:44 GMT
what is a blowoff???
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Post by tomplum on Dec 5, 2016 18:50:07 GMT
the blowoff is the pipe that goes out side, usually a 15mm copper pipe, its the safety valve,
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Post by dickpuller on Dec 5, 2016 20:07:27 GMT
I've had a bit of a daft crusade to not replace expansion vessels. Where they're easy to remove I strip the fuckers out & put a new schrader valve in them, pump them up to the correct pressure & put leak detection fluid on the valve & on the connection, check for bubbles.
You can buy guts for Schrader valves in Halfords.
Ive been amazed how few expansion vessels that are actually fucked!!
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