If your radiator is not heating up properly, several possible issues could be causing the problem:
Air Trapped in the System – If only the top part of the radiator is cold, there may be air trapped inside.
Solution: Bleed the radiator to release the air. This is how you bleed your radiator:
Bleeding a radiator is a simple process that helps release trapped air, allowing hot water to circulate properly. Follow these steps:
What You’ll Need:
- A radiator key (or a flathead screwdriver for modern valves)
- A cloth or small bowl (to catch any drips)
- Protective gloves (optional)
Step-by-Step Guide:
- Turn Off the Heating – Ensure your central heating system is switched off and the radiators have cooled down to avoid burns.
- Locate the Bleed Valve – Find the small square or slotted valve on the top corner of the radiator.
- Insert the Radiator Key – Place the key (or screwdriver) into the valve.
- Turn the Valve Slowly – Turn it counterclockwise (about a quarter to half a turn). You will hear a hissing sound as air escapes.
- Wait for Water to Drip – Once water starts dripping steadily, the air is fully released. Quickly turn the valve clockwise to close it.
- Check Boiler Pressure (Combi and System Boilers) – If multiple radiators were bled, check your boiler pressure. If it’s too low, you may need to repressurize the system (follow your boiler manual for instructions).
- Turn the Heating Back On – Switch the heating back on and check if the radiator is now warming up properly.
Sludge Build-Up – If the radiator is cold at the bottom, sludge or debris could be blocking the system. Solution: A power flush or chemical cleaning may be needed. Installation of a magnetic filter while help prevent build up.
Faulty Thermostatic Radiator Valve (TRV) – If the radiator stays cold, the TRV may be stuck or faulty. Solution: Try adjusting or replacing the valve. Usually done by a professional.
Radiator Valve Closed – If the radiator isn't heating at all, the valve may be closed. Solution: Ensure both the inlet and outlet valves are open.
Boiler or Central Heating Issues – If multiple radiators are not heating, the system may need balancing. There may also be an issue with the boiler. Solution: Check the boiler if necessary or contact us!
