Airlocks. One of the most common reasons why radiators may not be working downstairs is airlocks in the heating system. Airlocks occur when air gets trapped in the pipes or radiators, preventing the hot water from flowing properly. If the hot water isn't able to reach the lower section of your heating system, this can result in your radiators.. An underpowered boiler may struggle to generate adequate heat to reach the downstairs radiators, resulting in lukewarm or cold radiators. Obstructions such as limescale buildup or debris in the pipes can impede the flow of hot water to the downstairs radiators.

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There is also a single downstairs radiator connected to the loop before the valve. The issue started after we replaced our old boiler, a Potterton RS60 floor standing boiler with a Glow-worm Easycom 25r, the radiator connected direct to the boiler loop does not get hot. Also the downstairs radiators were only partially getting warm. Things I've.. Radiators not getting hot downstairs. Anonymous user 10 October 2021 - 12.02 PM. Hi, I have a problem with my central heating system, basically the radiators arent getting hot downstairs. The thermostat and boiler seem to be working when heat is called for. I suspect a faulty pump but its making all the right noises and if you remove the cap in.