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Central Heating Question
I have a problem with two out of three upstairs radiators not working.
My sister has three radiators upstairs and two downstairs. The downstairs radiators work fine. Upstairs two of the three will not get hot at all. I have put some cleaner in the system to remove sludge for her (The heating system is old) and then rinsed it out, but this has not had any affect on the problem. I have also bled all the radiators properly and there is water to the top of all radiators. Both of the non heating radiators are on the same side of the house and they are fed by what I think is 8 mm copper pipe. The downstairs radiator, on the same side of the house as he non heating radiators, works fine. The boiler works ok, although it is very old (Potterton Flamingo II) and the hot water appears to be working ok as well.
One of the radiators is in the bathroom, and the other is in the room next to the bathroom.
Any expert (Or DIY person) willing to shed some light on this for me? All ideas for sorting this problem will be very much appreciated.
I have tried turning the pump up to setting 3 to force the water around the system but this doesn't work either.
check the valves are open fully take the top of the lockshield valve and check they are fully open with gland pliers, turn the other rads off and run the heating see if this helps sometimes it's. just a case of balancing the system so each rad gets a good flow. If you have no joy turn both valves off drain the rad and remove from the wall, open each valve in turn and see if you have a flow through the valve you mention 8mm pipe and this is prone to sludge and block, good look.
Answered 30th Mar 2013
There is a manifold under the floor it must be blocked stopping some rads from working, remove this and replace, with new or clean.
Answered 5th Dec 2014
Have you tried turning off the rads downstairs and checking if the upstairs ones heat up? If they do, then it's a balancing issue. If they don't, then it could be a blockage or more likely an air lock.
Just as a side note, increasing the pump speed is great for fault finding purposes. It can however, increase the chances of sludge building up in the system. Once the fault has been rectified, I would recommend that you turn the pump speed down to the minimum that's required to keep the system running.
Answered 1st Feb 2015