I have two radiators in my system that fail to get hot, one gets luke warm the other stays cold. I have bled them so there is no air in the system. If I undo the pipes water flows through. The rads then get warm but go cold afterwards any suggestions. Pressure in system is fine. Im fed up of being cold in my bedroom.
2007-02-23 23:00:10 · 9 answers · asked by Anonymous in Home & Garden ➔ Maintenance & Repairs
You have an air lock in the pipework. Get some cloths and a bucket, and someone to watch the water pressure on the boiler. Turn off the valves on the cold rad, and sloly undo the plain plug on the opposite end to the bled valve. Some water will run out. When water stops running, Open one of the valves, and let the water run until it is hot.You have to have someone to keep refilling the boiler as this water runs out. Once this water runs out hot, close the valve and do exactly the same with the other valve. When the water runs hot out of the rad then close the valve, replae the plug and vent any air Check pressure on the boiler is 1 bar or 1 and a half. That will do it.
2007-02-24 01:02:51 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Yep, the problem is most commonly at the valves. First try to bleed the system of any trapped air by openning the valves. If this doesn't work, then flush the radiators and see if that helps. However, if these things fail, the pipes are probably clogged at the valves. It may be that you can re-plumb the and clear the stopped valve to get the down-line radiators operational. However, due to the age of the system, it is likely that they all have some significant degree of blockage. If it were me, and if the lower level is working, I'd re-pipe the whole upstairs to start. When you say 'conventional pipe', is it galvanized steel pipe or copper? Galvi, which was commonly used, rusts from the inside out and over a period of years, slowly strangles the pipes flow. Galvi is now considered an inferior material for plumbing, except for venting purposes. Consider, if you are dealing with Galvi and disconnect the pipe in question, it could be so badly rusted that it may crumble. You may not find enough good pipe to couple a quick fix repair. At minimum, be prepared to re-pipe the length between that good bathroom to the next radiator. Replace Galvi with copper. If it's more than you are comfortable with, then hire a licensed plumbing contractor for that bath to bedroom part of the job. Watch the plumber do the work, then maybe you can by the materials and do the rest yourself, especially if you have wrenches and can solder. The materials won't be too expensive, but the plumbers labor and profit margin on a complete re-pipe will not be cheap.
2016-05-24 05:14:53 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Here's a similar problem that was fixed on the TV show "This Old House"
Repairing a hot water radiator system
Richard helps a pair of Pennsylvania homeowners who have an upstairs radiator that won't heat. Richard determines that the cause of the problem is that air inside the radiator is preventing hot water from flowing through it. The homeowners explain that they have tried to bleed the air from the radiator, but it has not solved the problem. Richard then determines that the root cause of the problem is at the boiler. He replaces the old steel expansion tank with a new diaphragm expansion tank and relocates the circulator pump from the “return” side of the boiler to the “supply” side. By pumping away from the expansion tank connection, the system will maintain a higher static pressure, allowing the air to remain in solution. They finish by bleeding the remaining air from the radiator.
2007-02-23 23:19:46 · answer #3 · answered by bobweb 7 · 0⤊ 0⤋
I have just had new valves fitted to all my radiators. I made sure all the valves are at + position and turned on the boiler. I was running around the house bleeding air out of the rads for 3 hours. There is always some air trapped inside. If no water is squirting out of the bleeding key hole then your radiator is not properly bled. Just keep trying.
2007-02-23 23:19:25 · answer #4 · answered by Kira 3 · 0⤊ 0⤋
The problem may be due to sludge in your radiators. This is a black stuff that accumulates in the radiators over the years and blocking the circulation in the radiators but letting the water go through the inlet and outlet. Flushing the offending radiators might solve the problem. Your local Central heating engineer should be able to do it for about £50. If your quotation is anything more that, it might be a good idea to get a couple of new radiators.
2007-02-23 23:41:15 · answer #5 · answered by East Ender 2 · 0⤊ 0⤋
There probably is still air to bleed..When i had the problem,i turned on all rads,full and then bled again..All fine ..
2007-02-23 23:06:33 · answer #6 · answered by trish b 7 · 0⤊ 0⤋
Sounds like your entire system needs flushed. I had a pump changed some years ago and couldn't believe the black filth that came out during system drainage.
2007-02-23 23:12:53 · answer #7 · answered by Del Piero 10 7 · 0⤊ 0⤋
rads in two bedrooms warm at bottom cold at top bathroom rad in bathroom very hot this one replaced few years ago . boiler in kitchen is about 20 yrs old it is a combination type downstairs heating fine suggestions please
2016-02-27 20:15:19 · answer #8 · answered by Ian 1 · 0⤊ 0⤋
what speed is your pump running at it
could be to fast set it down a bit
good luck
2007-02-23 23:07:13 · answer #9 · answered by S Csparky 6 · 0⤊ 0⤋