1 radiator not working

frank_spencer · 6 Dec 2007

Just lately I've got 1 radiator (upstairs) that no matter how many times I bleed it drops al the water after less than 24 hrs. It has not been touched in any way since we last had the heating system on. All the other rads are fine, it's not leaking from anywhere and is fine once bled but just does not last. Any ideas

JohnD · 6 Dec 2007

you mean it needs bleeding again?

I expect it is positioned so that it catches most of the gas in the system. maybe it is above the boiler or next to the pump.

You probably have corrosion in the system and should clean and inhibit it. Gas is produced by the corrosion of the steel radiators which also produces black sediment and turns the water black.

there is a chance that air is being sucked in by the pump, if you have a leak, or it is possible that water is being pumped up to your feed and expansion tank in the loft and picking up dissolved air.

Next time you bleed the rad, hold a lighted match to the vent and see if the gas will ignite (move curtains and other flammable objects away). Corrosion produces hydrogen.

frank_spencer · 13 Dec 2007

Tried that and it just blew the match out. I don't suspect it is corrosion related, but cannot seem to find any reason for it draining so quickly. As previously stated it bleeds fine but is empty again within 12 hours.

Bahco · 13 Dec 2007

What system do you have.

frank_spencer · 13 Dec 2007

It's a conventional system.

Bahco · 13 Dec 2007

Is the rad higher than the Feed tank and does this tank have 4 inches of water in it?

frank_spencer · 13 Dec 2007

The feed tank is higher and has plenty of water in it.

JohnD · 13 Dec 2007

if you drain half a bucket of water, does exactly the same amount of water immediately flow out of the F&E? (you may need to tie up the ball valve to check)

Nige F · 13 Dec 2007

Archimedes

incorrect piping vent/coldfeed incorrect

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1 radiator not working

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