cold radiators

Joined
25 Sep 2006
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United Kingdom
Hi!

I've drained my system in order to replace two broken radiators. All the old ones I've had off to rinse through, and I've fitted thermostatic valves to upstairs ones.

Put heating on yesterday. All okay after bleeding, except one upstairs radiator. I left the bleed-screw right out for about an hour or more, and thought there was a slight hissing, but it stayed cold at the top though hot at the bottom, and no water spirted.

Drained system again today to fix a leak. Refilled. Now several of the radiators are odd. Some hot at bottom not at top, one hot at top and not at bottom. Some of the pipes are cold as well.

Help,please!
 
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Could be your feed pipe is blocked, so it fills really slowly.
Sometimes you can use a water-vac or the mains to get it cleared, round the feed-vent pipe loop by applying vac or mans on one or the other.

It blocks with sludge/scale which is also the cause of rads being cool at the bottom.
 

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