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AnswerWhy is my radiator not heating up at all?
A radiator not heating at all is usually a closed or stuck valve, trapped air, a sludge blockage, or a system that needs balancing — check the valves are open first, then bleed it.
In more detail
If one radiator stays cold while others are hot, it's usually that radiator; if none heat, it's the boiler or pump.
2026 figures · BTU uses standard UK heat-loss methodology; running costs use the Ofgem price cap · always confirm with a professional.