Hi Last radiator in system not getting warm at all. Central heating is pressurised to 1.5 bar, with HW gravity fed (no idea why this has been done!) Have closed all TRVs and closed lockshield on all rads except one in lounge which has traditional valves. Still didn't force water thru last rad, so removed radiator and flushed thru, water was actually very clean. Drew water thru both valves when rad was off and got hot water. Refitted rad and bled and repressurised system. Tried to rebalance system by small turns on lockshields in order from the boiler. Still no hot water to either pipe on last radiator. Lost for ideas now, help please
You can try back flushing the pipes if you think they could be blocked, Plastic or copper pipes? Could have a kink in plastic. Could be piped up incorrectly e.g 2 flows or 2 return pipes to the same rad Air lock possibly try bleeding the rad then pulling through with a wet vac if you have one or can borrow one. Cold pressure should only be 1 bar any more is just putting excess pressure on every joint rad pump heat exchanger etc
Copper pipes and radiator has worked in past but not for a while. Got a wet vac will try drawing water thru, and drop pressure.
I've done it with great success bleed nipple out and go for it if you can Might need someone topping up the boiler while you vac the rad
Hi DNR Plumbing I have drawn about 6 pints thru the bleed valve with the wet vac, the pipes get luke warm but rad still cold. Had to repressurise twice. Should I continue?
No that's more than enough your not getting flow to it for some reason try closing all valves on all other rads and see if it gets hot with both its valves open fully
the plot thicken... turned off all bar 1 rad which is working and faulty one. Feed pipe of faulty rad started to get hot, but rad only slightly warm, return pipe cold. Turned off the working rad and the faulty rad pipe stopped being warm and boiler switched off. Any further thoughts appreciated
Piped up incorrectly that's why when you shut the flow to the correct good rad the boiler overheated and turned off
So the feed to the faulty rad DOESNT have the TVR on that end, is all I need to do is move the TVR to the feed to the radiator?
I would suggest that it's been installed incorrectly rather than a faulty valve You can remove the TRV replace with a lockshield and text again
Forums
Facebook
Twitter
You Tube
Instagram
Shop