Why are my radiators not working but hot water is?

If you’ve got hot water, but no central heating then there are more issues it could be if it’s not the thermostat or the boiler pressure. Common reasons for this particular fault are broken diaphragms and airlocks, or a motorised valve failing.

Why won’t any of my radiators turn on?





2. Check for Trapped Air and Bleed Your Radiators. If just one (or a few) of your radiators aren’t heating up, the most common reason for this is trapped air. If you’ve just turned the heating back on after the summer, air can become trapped in your radiators, causing them to be warm at the bottom but cold at the top.

Why is my boiler working but radiators are cold?

If your boiler works but the radiators are not heating up, then likely cause could be a faulty boiler pump or your central heating controls. If your boiler works but the radiators are cold, check that the thermostat or timer is working correctly.

Why are my radiators cold when the heating is on?

Why is one radiator cold when the heating is on? One cold radiator usually indicates that either there is air in the system or there is a stuck valve within that radiator. The thermostatic radiator valve (TRV), like the one pictured below, controls the flow of hot water to the radiator.

Where is the diverter valve located?

It’s usually a lever that’s situated behind the bath taps that you can pull up or push down. System and conventional boilers don’t require a diverter valve.

How do I know if my diverter valve is faulty?





A diverter valve may be faulty if the hot water taps still work while the radiators do not turn on. Another sign of a faulty diverter valve is if you only can only get lukewarm water from your taps.

How do I free a stuck radiator valve?

A radiator valve can get stuck when the pin that starts the mechanism fails to move. To fix this, you need to remove the valve head to gain access to the pin. Apply enough pressure on it until it springs back to its original position. If this method is not working, tap the valve until the pin dislodges.

Why is my central heating not coming on?

Check your thermostats

If the thermostat is set too low, the heating will not come on until the room temperature is lower than the temperature you have set the thermostat to. Turn the thermostat up to its highest setting and see if this resolves the problem.

Why is half my radiator cold?



When a radiator appears to be cold at the top but still warm at the bottom, the usual culprit is air trapped in the heating system. There is a very simple approach to fixing this, which is to bleed the radiator. Bleeding a radiator releases the trapped air, allowing your radiator to run more efficiently.

Why are 2 of my radiators not working?

If multiple radiators in your home aren’t working, you may need to ‘balance’ the system. Unbalanced radiators won’t heat up at the same time, so if you have some radiators which are very warm and others which are cold, this could be the issue.

How do you bleed air out of a radiator?

Put the garden hose into the top opening of the radiator. Turn the water on and set it to flow lightly. The water will fill the radiator but will flow out of the bottom drain. You can do this with the car off to flush only the radiator or with the car running to flush the whole cooling system.

How do I turn my radiator on?



Operating a Radiator’s Controls. Turn the radiator dial counterclockwise to turn it on. The control valve is located near the bottom of most radiators. On a steam radiator, it is the valve on top of the pipe leading into the radiator.

Which side of the radiator turns it on?

Turn valves clockwise to turn your radiator off and anticlockwise to turn it back on.

Do you bleed a radiator when it is on or off?

Turn off your heating. You can’t bleed a radiator when the heating is on, as it may be too hot to touch. You could also get hot water spraying out of the radiator. Use your radiator key to turn the valve at the top of the radiator.