I renewed a downstairs radiator and pump in an open system.The bottom rads get hot but the upstairs ones remain cold. The system has been fully drained down & filled again & yes the pump is fitted the right way round & is working fine.I have bled all the rads, but one will only just dribble water out but still no air comes out ? If i take the bleed screw out of the other rads upstairs the rads heat up but when the screw is put back in they go cold again. Please help !!
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cold upstairs radiators
- Thread starter kamitcho
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- 20 Apr 2014
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I'm not exactly an expert but had a similar problem. Try balancing the manaul valve (the one that turns the heat on/off on the radiator) with the lockshield valve (other side) on the new radiator;this can be done by buying thermostats that clip to the pipe just below the valves on both sides of the rad.Open manual valve fully & allow to warm up. Take the cap off the lockshield valve & adjust with spanner until thermostat on that side is 11oC (20oF) lower on that side than on the manual valve side.My D.I.Y book recommends balancing all the radiators when a new pump is fitted.Good luck.
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