Todays central heating systems are more efficient and less prone to having faults than older systems, but this doesnt mean they wont have problems of there own. Below are some of the common problems you might encounter with your heating system.
The most common problem you might come across with your central heating system is it doesnt turn on and heat up properly. This may be caused by the pilot light being out. Check the makers instructions and relight.
If you notice it wont re-light, it might be the thermostat which is set too low or the timer isnt working. To be sure that its not this thats causing the problem, check them both and try again.
There are leaks in the pipe work
Leaks in the pipe work are easily noticeable upstairs rather than on the ground floor, where water might drain away without damaging the structure of the house. Look out for dark patches on the ceilings or damp flooring which can indicate water damage. Also a drop in pressure from a combi-boiler can also indicate water leaking somewhere in the system.
If the leak comes from a joint, turn off the central heating system and tighten it with an adjustable spanner or wrench. Make sure you dry the joint and wrap some tissue around to make sure the leak has stopped.
For cracks or holes in the pipe work, turn off and drain the system. Replace the damaged pipe and check for any further problems.
Although if you arent entirely sure of how to carry this process out exactly then always hire a professional to do it for you, both for safety reasons and the fact you know the work will be done properly.
If one radiator doesn't heat up
If the rest of the system is working but you have a cool radiator, make sure the thermostatic or manual valve if fitted, is open enough for the water to pass through.
If this doesn't work, the lock shield valve at the other end of the radiator may not be properly open. This can be adjusted with a spanner.
With certain types of radiators they will need bleeding every so often because they fill up with air and this prevents them from heating up properly. You can find out the type of key you will need to bleed your radiators from a heating shop. When you have the correct key you can then open the valve slightly and then the air that is trapped will drain out. Be sure to do this only when the heating has been switched of for several hours and with a cup or bucket underneath because when all the air is out the water will begin to drain through.
If there are knocking noises
Knocking noises from the radiators may be caused by a blockage or heat build-up in the system. This is usually a problem that can only be fixed by a tradesman but make sure this isnt caused by lack of water in the boiler. Firstly go into the loft and see if the feed and expansion tank is empty. If water flows into the tank when you adjust the float up and down, replace the float valve unit before it causes any further damage. If there is no water in the system, it may be that the mains water supply has been cut off or the pipes might be frozen.
