Airlocks within a home heating system are one of the main reasons that can cause downstairs home radiators to not work properly. Airlocks essentially form when air becomes trapped in pipework or radiators to stop hot water from properly flowing.
When hot water can no longer reach the bottom section of a heating system, it can cause your radiators to function correctly upstairs but not downstairs. This issue is more commonplace in cases where radiators are fed by droppers from upstairs.
For further information on airlocks and how to combat them, explore our blog, Why are my downstairs radiators not working?