DIY Doctor

Hot water but only one radiator hot.

Postby armytouch » Thu May 08, 2008 1:35 pm

Hi have just moved into house and things seemed fine until i went to plumb in my washer,no pipes so called in plumber. He turned off heating and cold water,he then went to find water tank which had been moved into attic he explained that when the cistern had been moved no stop valves had been installed either to the cistern or to the water supply,the only stop valve was the cold water stop cock,so he would have to drain the full system so could put in the hot water pipework for the washer.
He ran off all the water and installed the washer taps,he then refilled the system bled the radiators relite the pilot like and put heating on.The hot water was fine and the radiators warmed up so he left.
The radiators installed upstairs are different than down,upstairs have only one valve on one side and then pipe runs straight out without valve the other side,where as radiators downstairs have valves both sides.
The next day only one of the radiators would come on,hot water fine,it was the upstairs bathroom radiator both side pipes going in and out were hot but all others where cold, i was told to check the pump which is a very old one,it was hot and pipes on either side where hot,however the pipe running to the next radiator approx 12 in from the pump was getting cold.
I looked at radiator and there is a drain valve between the pump and the radiator thought releasing valve may release air lock however when opened it nothing was released no air and only tiny drops of water,so undid the radiator side valve along from drain valve and water was released.
Have tried to give as much information as possible,if require more please ask.
I would like some advice on what as caused this problem and how it can be fixed,is it an air blockage,if so how can i rectify it,is it the pump gone,how can i check to see if pump working correctly,why is pipes hot going into pump,pump hot itself and pipes hot coming out for about 12in before it goes cold.
Any help and advice would be very grateful
all the best
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Simply Build It

Postby Balkor » Thu May 22, 2008 8:27 am

im still not that experienced of a plumber as im still ib my first year of college but it sounds to me like either an air lock or just a normal bloackage in the radiator. I know there are things you cna buy which go through the heating systems and clean it all out but if its an airlock you might need to drain them down again and bleed.

Im not too sure about pumps yet though, havent done much work on them but if it is an old pump theres a chance it could be broken or not working at full power

Hope it helps.
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Postby Rico » Thu May 22, 2008 9:01 am

Hi there A.T

First question that needs to be asked is why was the central heating system drained if he was only fitting HOT WATER supply, this has nothing to do with the sentral heating.

I would get your plumber back to rectify and find out why he drained the central heating system.

Also would help to know what type of system you have, I assume a cylinder and f&e tank in the loft.

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Postby htg engineer » Thu May 22, 2008 3:52 pm


armytouch also posted this problem in the central heating forum.

I think this problem has been sorted - there hasn't been any posts lately anyway.

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