Hi, can anyone suggest any help with the following. i have replaced 2 radiators with new doubles. one is fine but the other seems to be unequal in temperature across the top than the bottom (top hot, bottom cooler). I know there is no sludge in the system as the whole system was jettted when a new boiler was fitted 3 yrs ago. also, when I replaced the radiators, the water was very clean. I have also cranked up the pressure and bled everything to within an inch of its life. I have a dual flow TRV and checked that it is set in the correct direction (the valve is on the ouflow). I think I have tried everything but the only thing that seems to solve the problem is turning off all the other rads and cranking up the boiler through just the problem rad, but the problem persists once I turn all the other rads back on. could the TRV be faulty?
I'd be really grateful if someone could suggest a possible solution
I'd be really grateful if someone could suggest a possible solution