Konrad von Carstein Posted December 3, 2020 Share Posted December 3, 2020 Just had a new radiator & valve (Drayton TRV4) fitted...the issue we have is that the radiator is not heating up, the pipework and valve connection into the rad are v warm but the rad itself is barely lukewarm. I have bled the system, turned all the other radiators in the house to the lowest heat and left it running on its own for the past 4 hours. Any of you in the trade have any thoughts on what could be causing this and is it fixable by an amateur (me) before trying to get the plumber back to the house? At the end of the day I'll have him back here if it's not easily fixed but was hoping to avoid the hassle. Quote Link to comment Share on other sites More sharing options...
Gulpener Posted December 3, 2020 Share Posted December 3, 2020 Is the valve at the other end of the radiator open? Quote Link to comment Share on other sites More sharing options...
Mark_Mywords Posted December 3, 2020 Share Posted December 3, 2020 6 minutes ago, Gulpener said: Is the valve at the other end of the radiator open? This, or maybe the valve pin is stuck. Quote Link to comment Share on other sites More sharing options...
milky_26 Posted December 3, 2020 Share Posted December 3, 2020 Can you swap the valves between a radiator that works and the one you are having issues with? Should easily unscrew. That might help diagnose if it is the valve or as posted above the end of the radiator it is on Quote Link to comment Share on other sites More sharing options...
Konrad von Carstein Posted December 3, 2020 Author Share Posted December 3, 2020 1 hour ago, Gulpener said: Is the valve at the other end of the radiator open? Its a pin thing that moves freely enough... 1 hour ago, Mark_Mywords said: This, or maybe the valve pin is stuck. Again this appears to be moving freely 31 minutes ago, milky_26 said: Can you swap the valves between a radiator that works and the one you are having issues with? Should easily unscrew. That might help diagnose if it is the valve or as posted above the end of the radiator it is on No its the first in the removation plan, all other rads have an eclectic mix of thermostatic valves. I have since been on the phone and someone is coming round tomorrow... Thanks for taking the time to respond... Quote Link to comment Share on other sites More sharing options...
flogel41 Posted December 3, 2020 Share Posted December 3, 2020 (edited) If none of the above suggestions work it could be an airlock. You can clear these with a hose. Couple of decent videos on YouTube to talk you through it. is it an additional radiator or a replacement? If it’s an additional radiator it may be it’s too many radiators for your boiler to heat. Especially if it’s furthest from the boiler sorry Just seen your update! Edited December 3, 2020 by flogel41 Missed new post Quote Link to comment Share on other sites More sharing options...
davemclaren Posted December 3, 2020 Share Posted December 3, 2020 We have a radiator in our bedroom that never goes more than mildly warm. Tried to bleed it but seems fine. The odd thing is that the pipe at the non thermostat side feels very hot and the pipe coming through the thermostat is not. Could it be fitted the wrong way round or is the thermostat dodgy? 🤷🏼♂️ Quote Link to comment Share on other sites More sharing options...
Howdy Doody Jambo Posted December 3, 2020 Share Posted December 3, 2020 I've got the same problemoh, put in a new system and boiler last month, the heating engineer has been back on Monday, farted about with an Allen key then said it should be fine, will have to get him back again as 3 radiators upstairs aren't heating up properly although I'm thinking it could be due to an old bathroom radiator which is being changed shortly which could be blocking the system flow Quote Link to comment Share on other sites More sharing options...
Jambo314 Posted December 3, 2020 Share Posted December 3, 2020 15 minutes ago, davemclaren said: We have a radiator in our bedroom that never goes more than mildly warm. Tried to bleed it but seems fine. The odd thing is that the pipe at the non thermostat side feels very hot and the pipe coming through the thermostat is not. Could it be fitted the wrong way round or is the thermostat dodgy? 🤷🏼♂️ If the radiators are quite old its probably the pin on the thermostat that's sticking? Quote Link to comment Share on other sites More sharing options...
davemclaren Posted December 3, 2020 Share Posted December 3, 2020 9 minutes ago, Jambo314 said: If the radiators are quite old its probably the pin on the thermostat that's sticking? Radiator is 25 years old. Will give the pin a wee tap/shoogle. Quote Link to comment Share on other sites More sharing options...
The Real Maroonblood Posted December 3, 2020 Share Posted December 3, 2020 19 minutes ago, davemclaren said: Radiator is 25 years old. Will give the pin a wee tap/shoogle. Quote Link to comment Share on other sites More sharing options...
Jambo314 Posted December 3, 2020 Share Posted December 3, 2020 21 minutes ago, davemclaren said: Radiator is 25 years old. Will give the pin a wee tap/shoogle. If that doesn't resolve the issue a power flush may be required as there may be a build of gunge in radiator? Quote Link to comment Share on other sites More sharing options...
davemclaren Posted December 3, 2020 Share Posted December 3, 2020 7 minutes ago, Jambo314 said: If that doesn't resolve the issue a power flush may be required as there may be a build of gunge in radiator? Thanks. That sounds expensive. 🥴 Quote Link to comment Share on other sites More sharing options...
Jambo314 Posted December 3, 2020 Share Posted December 3, 2020 Just now, davemclaren said: Thanks. That sounds expensive. 🥴 It's not cheap, had it done about 5 years ago, approx £350 but it will be depend on size of house/how many radiators. Scottish Gas quoted more than double that🙄 Quote Link to comment Share on other sites More sharing options...
davemclaren Posted December 3, 2020 Share Posted December 3, 2020 4 minutes ago, Jambo314 said: It's not cheap, had it done about 5 years ago, approx £350 but it will be depend on size of house/how many radiators. Scottish Gas quoted more than double that🙄 Yip, they quoted me about £700 a few years back then decided I didn’t need it, thankfully. Quote Link to comment Share on other sites More sharing options...
Worthing Jambo Posted December 6, 2020 Share Posted December 6, 2020 Remember not to bleed the radiators when the heating is running as it could suck air in. Best done when cold. Quote Link to comment Share on other sites More sharing options...
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