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No Idea whats wrong

  • Thread starter Thread starter davie a
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davie a

Recently had rads replaced in house except living room tall rad. The system was drained and rads replaced then filled upto 1.5 bar. I then went round balanced and bled the rads until I got water with no air.

However

Im now having an issue with the tall vertical rad in the living room, all the others are heating up fine but the one in the living room is only heating up at the base the rest of the rad remails cold and whe the CHS is on I hear water spurting/running every few seconds inside the rad but have no idea what to do sort the issue. I think this means airs in the system but as im not a plumber id appreciate help from the PROS.

Thanks i know this is long.😕
 
I think you have a blockage. Might want to isolate the rad and try flushing just that one rad. Are there TRV's and have you checked them?
 
HI PuraTherm cheers for reply.

Rad had a TRV and all ive done regarding it is turn it up and down dont know what else to do with it. Could a blockage suddenly happen after draining system/replacing rads/filling system?

Also could you explain how to flush a rad after isolating it ?
 
First try to see if the TRV is stuck. Tap it with a screwdriver while turning it. Give that a try. I have had entire heating systems block up after flushing. Shut the TRV and the lock sheild valve off. Open the bleed valve and drain the rad from the unions. This might take abit of time. Take the rad outside and use the hose on the outside tap to flush it through. Reinstall and refill. I would start with the lock seild and TRV first though.
 
Ok thanks ill try that. How could a faulty TRV cause the rad to partially heat and cause the squirting noise? I didnt realise they where so intergral in the function of a rad.

Hey every days a school day.
 
The TRV works on a spring. When the system is pumping the pressure of the water circulating could be causing the water to bybass making the rad only go hot low and causing the noise. This will better explain how the TRV works.
[DLMURL]http://heating.danfoss.com/PCMPDF/trv01.swf[/DLMURL]
 
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Tried tapping while turning valve and another part has heat up so is there anything else i can do with the trv before replacing it?
 
Presumably the radiator's been bled? If hot water's going in past the TRV then the TRV will be okay.
 
yeah to death, bled it for a few mins removing some water and at times it ran fine but occassionally spluttered
 
I assume if only half is heating up you tried to bleed the rad again? Being a tall rad it will be the one that gets the air in until it's all out

Edit: Beaten to it... But keep bleeding it if you only bled it once
 
What about the lockshield? (Opposite end to the TRV). If you pull the plastic top off, get an adjustable spanner and open it up more that might make the difference. Go gently though as they are quite fragile and you'll end up with a lovely indoor water feature if you break it!

I'm assuming that proper hot water is in the bottom section. Is it the same temperature as the pipes? Are both pipes properly warm? Also (as it sounds like a "designer" radiator is there more than one bleed valve? (Unlikely, but without seeing what it looks like ...)
 
If both pipes are hot and bottom of rad is then water's definitely circulating.

Only possible now is there's either a blockage in the radiator or, much more likely, it needs more bleeding.

If you get a towel and (don't remove it) but open the bleed valve for longer and if it splutters that means there's more air to escape. Keep touching the "warm level" of the radiator to see if it rises.
 
yeah sounds more like bleeding but i took about 1 litre from it and it did splutter once. Do i keep doing it or is there a better way?
 
Upping pressure wouldn't really help. I'd have another go at bleeding and if this doesn't work (assuming it's quite new) I'd arrange for the installer to come back. Or if you installed it, I'd take it off, flush it out and try again.
 
anoter development boilers on but some of the rads are cold even thought they were hot 30mins ago, i turn the TSV and they heat up again.

Are the symptoms of one bigger problem.? or is that just what TSV should do?
 
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remember the system was filled quickly would that let lots of air in or would it make no difference and how can i get air out the system?
 
Doubt the speed of filling would make too much difference. To remove air you bleed radiators. Lowest bleed valve first (not necessarily the lowest radiator in your case) and highest bleed valve last.
 
Ok Live in single story house, so if i start bleeding rads what if i open bleed valve and theres no air just water? which is whats been happening. trying again and will start at lowest and end with vertical rad.
 
just went round rads , first 2 fine but rad 3 and 4 are runing slow then its like a jet shoots out then slow and the jet and so on now verticle rad is making noise all the time. Do i continue to bleed unil jet on off stops?
 
Turn all the rads off just leave on the tall rad/ones with air still in them on and try bleeding them
 
ok ill do that. had a look at TRVs and they are danfoss bi directional , could they be the wrong way?
 
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