The usefulness of a central heating system within a home is emphasized when it suffers from a problem that stops it from working properly. Being aware of the issues that can arise will help you to determine how to rectify them.
Uneven Heat Distribution
If you experience the problem of the top part of a radiator being a different temperature to the bottom half, you will usually find that this is due to a build-up of air in the central heating system. To rectify this, you will need to bleed the radiator which can be done with the use of a radiator key after turning the system off.
While holding a cup or container below it, the key must be twisted in the valve in the top corner of the radiator to release the air that has formed within it. Once the air is released, hot water will begin to flow from the valve which should be collected in the container. Be careful as the water will be very hot. After closing the valve, use a cloth to wipe away any excess water on the radiator.
The action of pipes expanding and contracting in the process of the central heating system being used can cause knocking and popping sounds when the system is switched on or off. This can become normal for old pipes or those that are fitted too close together. Undertaking a pipe replacement should rectify this problem.
If the central heating system is failing to heat your home, check to see whether you are still able to receive hot water. If it is only the heating that is causing a problem, this will be caused by the central heating pump and pump valve. These tend to effectively go dormant if the central heating is not used for an extended period of time and will have to be restarted. This may involve nothing more than giving them a gentle tap with a hammer to free any seizures.
If your radiators are providing no heat and the hot water has also failed, this will be due to a problem with the power supply that feeds the boiler. After verifying that the power supply is actually on, determine whether the problem has been caused by a blown fuse. Turning off the system and replacing the fuse should rectify the problem. Check the pilot light to ensure it is operating and look for any potential problems with the power supply.
Only Some Radiators Heating
If only certain radiators in a full central heating system are experiencing heat, this could be due to an unbalanced system. It may be the case that the radiators closest to the power source are taking all the heat and stopping it from continuing any further. The system will need to be rebalanced so that heat is spread equally.
Where the heat doesn’t match the temperature at which the thermostat is set, this could be due to a build-up of rust in the radiators. This prevents hot water from flowing through it effectively. It may be necessary to remove the radiators and flush them out with a hose.