You should begin by checking that the thermostatic valves on your radiators are set correctly. Scroll to the bottom of our guide to setting up your heating and hot water
for more information on how to do this.
If you’re still feeling chilly with the central heating turned up high, it’s time to check your radiators. If they have cold spots, especially at the top, it’s likely you have air trapped in the system and it’s time to bleed your radiators. It’s a fairly simple procedure.
- You’ll need a radiator valve key or screwdriver and an old cloth.
- Turn off your central heating and allow the radiator to cool.
- Find the bleed valve, which is normally at the top on one end, and put the cloth directly below it to catch minor drips.
- Put the key into the valve and turn anti-clockwise until you hear a slight hiss of air. Once the hiss turns to a gurgle or water starts to escape, close the valve.
- Retighten the valve by turning clockwise and turn your central heating back on.
- With a conventional boiler the water cylinder may need to be repressurised.
After bleeding you still have cold spots:
- If the problem persists, or you have to bleed radiators more than once a year, you might have a different issue.
- It could be that rust or sludge has built up, preventing the water from flowing properly. However, this is unlikely within the first two years.
- Contact a Gas Safe-registered engineer, who may need to power flush your system.