Radiators are cold but boiler is firing
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Most likely cause & what to check
Check your room thermostat — ensure it's set above the current room temperature.
Check the boiler pressure — it should be 1–1.5 bar.
Bleed your radiators to release any trapped air.
After bleeding, recheck and repressurise if needed.
Check whether all radiators are affected or just some — faulty TRV valves may be the cause.
If all radiators are cold despite correct pressure, the circulating pump may have seized.
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