How to Clear Blockages in Your Central Heating System

What You'll Need
Copper wire
Steel nails
Hose (to drain system)
Central Heating Cleaning Fluid

You will find that over time your central heating system may have blockages that could require some clearing. It is important that you stay on these as the longer that these blockages go unnoticed or untreated the more damage that could be done to your system. It is also very important that you are able to clear these blockages correctly. If you do not do this the way that you should then it could cause even more damage to the system and you may have to end up replacing it all together.

Step 1 – Test

If you notice that there is a blockage but there is no emergency then you may want to take a day or two to run some tests. However, if there is a leak or some other problem that requires immediate attention then you should forgo this test and move on to treating the problem itself. You will need to start by filling a jar with the radiator vent water. Make sure that when you are loosening the vent so that the water can flow out that you do not loosen it too much as a flood will take place and the screw will be lost. Once you have a jar full of water you will need to put a handful of non galvanized steel nails as well as some copper wire into the jar. Leave them in the jar for three days. If they turn orange then there is corrosion in the system.

Step 2 – Drain the System

With most methods of cleaning out the system, you will need to drain it first. In order to do this, you will need to first set all of the thermostats all the way down to zero. From there, all of the electricity supply to the boiler will need to be shut off. The programmer needs to be shut down. The gas boiler needs to then be shut down and that all of the fuel boilers that are solid are taken out. The water supply to the expansion tank will need to be shut off as well. Once all of these things have been shut off you will then need to allow time for the system to cool off. The valve will then need to be opened as well as the radiator valves. Attach a drain to the lowest drain tap.

Step 3 – Cleaning

There are several different chemicals and cleaner that you will be able to use for your system. You will need to do your research and find one that will work best for you. Remember that some cleaners are not recommended for systems that are over twelve years old. Use the chemicals as directed.

Step 4 – Put Back together

Using the same steps you used to take the system apart, put it back together. Make sure that you take your time in putting it back together to make sure that you did not miss any steps or parts.