Help please. Already had one plumber out and problem persists. central heating system keeps draining. Starts as cold radiators then you can hear bubbling or water flowing in pipes then boiler cuts out. IF I reprime the system by letting all air out and increase pressure to 3 bar the boiler cuts in again. 4-6 hours later back to square one. Hot water system based on a large Megaflow tank. Any ideas. Wife and 6 cold kids causing me strife!
losing water from radiators
- Thread starter pt
- Start date
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B
breezer
pt said:
got to keep warm some how i suppose.
read the posts at the top first
pt it would appear that you have what's technically called, in the trade, a leak. I suppose ????? it's the boiler which you're talking about - Don't increase the pressure to 3 bar. Check if water's coming out of the pressure relief pipe which I assume ????comes from your boiler and goes through the wall.
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Next thing, check what happens to the CH pressure after you reprime the system and turn on the heating, does it rise significantly ?.
Could there be corrosion and a breach /leak of the primary coil inside the megaflow, so CH water enters the unvented hot water cylinder.
My suggestion, if you can't find an obvious leak as ChrisR states, see if the CH pressure affects the pressure in the mega flow.
Another test for a breach would be to turn off the boiler and drain down the CH. If there is a breach in the primary, the CH system will never empty unless you turn off the cold supply to the hot water cylinder.
Could there be corrosion and a breach /leak of the primary coil inside the megaflow, so CH water enters the unvented hot water cylinder.
My suggestion, if you can't find an obvious leak as ChrisR states, see if the CH pressure affects the pressure in the mega flow.
Another test for a breach would be to turn off the boiler and drain down the CH. If there is a breach in the primary, the CH system will never empty unless you turn off the cold supply to the hot water cylinder.
Thanks for sensible suggestions. I thought I would let you know outcome. I turned pressure up to 3 bar again and repeated the process a few times. Eventually water started appearing from behind skirting board adjacent to pipes under solid floor on ground floor - time to start digging. So yes it was what you technos call a leak!! thanks. I am not sure it will sort problem with cold radiators on top floor but well see. Ill let you know after repairs
Final closure on this one. leaking pipe under floor found and mended. 2 ends had completely come adrift! Surprised it was working at all. Excellent new plumber has fixed this and put in new bogger water pump which has sorted cold radiators on top floor. Kids say its too hot now! I know a good plumber in Epsom / Sutton area if you need one. Thanks
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