We have always had trouble with the largest radiator in our house, which is in the lounge. It's never really got that warm - we believe it's the last rad on the run of the system. The system is about 8-9 years old, mostly a concealed flexi-pipe system, we had a new Glowworm condensing boiler installed 5 years ago, replacing the defunct Baxi Barcelona that was installed when the system was new, along with a power flush, and we have a Magnaflow installed that we get very little matter out of when it's checked.
Before we had the boiler replaced, we had taken this largest rad off, drained it, flushed it and then checked the pipes to it as it wasn't getting hot. We discovered the pipes to the rad came straight down the hall and then kinked at nearly 90 degrees to then get to our rad. We dug up the floor to discover this, and tried to ease the pipe so it wasn't at such a sharp angle. After all this, the rad did work better, but now, several years in again, it's stone cold. The pipe to the TRV end is very hot, the pipe the other end is stone cold, as is the radiator. We turned off all the other rads in the house and just let the boiler run with this one open, and it got a bit warmer, but not much. Does this sound like there is a blockage in the pipe either to or from this rad? We have thought about taking this lounge rad off again, draining and flushing it, and then doing the same with the rad before it on the run, and then whilst both rads are off, trying to flush out the pipe in between them, to avoid having to dig any more concrete floor up.
The other things to say are that we think the system might need balancing too as now our bedroom rad (upstairs and diagonally opposite in the house from the lounge) is not getting hot - the pipe to the TRV end is cold, the pipe at the other end is hot. And our dining room rad (below our bedroom one) isn't as hot as it used to be, again TRV end very hot, other end not so, radiator hot enough at top, but cooler at the bottom. We are not sure that these other two rads are connected to the problem in the lounge, but any comments/thoughts/opinions welcome!
Have you checked the TRV ..?
Remove the head of the TRV, and check if the pin in the centre of the body is stuck down... if it is .. just grip it with a pair of pliers and see if you can lift it.
If the pipe below gets hot immediately ... enjoy ... and think about replacing the valve when the weather gets warmer.
They can get stuck down when they have'nt been used over a long period..( the summer).
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