Central Heating question

I have 3 radiators that are not heating properly. I ran the system though with some cleaner fluid. I have taken them off and flshed them with a pressure washer. I have checked the valves. Still having the problem, I then turned off all the other radiators, and ran the boiler. I then drained the system and the water was dirty, so i guessed that theer was still stuf in the pipes. I refilled, ran the system (still on the 3 rads) and drained again. I repeated this several times. I then ran a hose from the the drain tap to outside and turned on the filling loop. Now, heres my question. The water at this stage runs clear, even if it is still running at pressure through the system. If I repeat my refill-run-drain process as before, the water comes out a reddish colour. This seems to be improving the rads, they are a loy better than before.

Is it the case that water running through the system (3 rads still) is missing the dirt in the pipes, or is it the fact that the water is not going through the boiler and being heated that it is not coming out a reddish colour. I am going to be replacing my boiler soon, and dont want to fit it with dirty stuff in the pipes, but dont want to be flushing my pipes continuously if the boiler is the problem. Thanks in advance.

Reply to
Rob Walford
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I have 3 radiators that are not heating properly. I ran the system though with some cleaner fluid. I have taken them off and flshed them with a pressure washer. I have checked the valves. Still having the problem, I then turned off all the other radiators, and ran the boiler. I then drained the system and the water was dirty, so i guessed that theer was still stuf in the pipes. I refilled, ran the system (still on the 3 rads) and drained again. I repeated this several times. I then ran a hose from the the drain tap to outside and turned on the filling loop. Now, heres my question. The water at this stage runs clear, even if it is still running at pressure through the system. If I repeat my refill-run-drain process as before, the water comes out a reddish colour. This seems to be improving the rads, they are a lot better than before.

Is it the case that water running through the system (3 rads still) is missing the dirt in the pipes, or is it the fact that the water is not going through the boiler and being heated that it is not coming out a reddish colour. I am going to be replacing my boiler soon, and dont want to fit it with dirty stuff in the pipes, but dont want to be flushing my pipes continuously if the boiler is the problem. Thanks in advance.

Reply to
Rob Walford

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Reply to
malcolm

You need to make sure that the water from the filling loop is being forced the 'long' way round to the drain point. This may entail closing flow/return isolators on the boiler and/or it may not be possible with your current setup. You then need to make sure the water is going through the each radiator one at a time - the process should be audible.

Reply to
Ed Sirett

What happens when you bleed the effected rads? Any air in them? And where are they relative to the boiler? The first or last on the feed, or random?

If, say, they are all upstairs and only the downstairs ones work properly and all are clear of air, my first port of call would be the pump. If it's a three speed type, try increasing the speed. If a modulating type I'd guess it isn't working correctly.

Reply to
Dave Plowman (News)

I bleed the rads with each refill.

2 downstairs, one upstairs in random positions.
Reply to
Rob Walford

Try flushing at the radiators.

This can be a messy operation as you know, so warnings about covering the floor with plastic sheet, towels etc. Sludge stains indellibly. I am sure you are already aware of this.

Starting with radiators closest to the boiler, remove the radiator and take it outside for flushing with pressure washer as you have been doing.

Place a container under one radiator valve (cat litter tray from supermarket is good for this). Turn on water at filling loop and then open radiator valve. This will carry out crud that is in the pipes as well. Repeat for other valve having closed the first. Basically you are arranging that there is only one path for the water and crud is flushed out of the system and not around it.

Repeat for other radiators Note that this technique will also flush fresh water through the boiler.

You can mop up anything left by adding some desludging agent and running the system hot for a few days (according to the instructions). Then flush that thoroughly and refill with inhibitor.

When you do the boiler replacement, you should find that the water is pretty clean, but in any case fit a strainer on the return to the boiler just to mop up odd bits of copper swarf and general crud which find their way into the system.

Reply to
Andy Hall

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