Changing Central Heating Pumps

Central heating pumps are among the main mechanisms in a central heating system. Without these pumps, a central heating system will fail to do its job, because water will not be able to reach the different radiators in the central heating system. However, the central heating pump can also break down and fail – not only once, but repeatedly. When this happens, they will need to be replaced.

Do I Need To Replace My Central Heating Pump?

One sign that it’s time to replace your pump is if the radiators in your home are imbalanced, or the ones on the second level of your home heat up, and the ones downstairs fail to do so. Below are step-by-step instructions for changing your central heating pump.

1. Central heating pumps tend to be installed in varying locations, and it is possible to find that the valves have stopped. You could also encounter problems in taking out the nuts that connect the pump to the valves. Prior to replacing your central heating pump, see to it that any electricity supply to the pump is cut off temporarily. You should find a connection (fused) in close proximity to the controller or timer. This will need to be turned off, and the fuse is to be taken out. Afterwards, test wires that extend all the way to the pump. The best tool for this is a voltage tester (non-touch), for making sure that the electricity has been isolated. This is done for your own safety.

2. Online, you will find a lot of images available for central heating pumps. Perform a search to find out exactly what the central heating pump looks like. This pump is mostly placed in spaces that are not easy to reach, like beneath the floor. These types are often placed beneath airing cupboards. When you find your central heating pump, note the direction towards which the arrow is pointing. This is the direction of the water flow. Ensure that the direction where the pump’s arrow was pointing is the same as before you fitted the new pump.

3. You will find a valve on either side of the pump. Following a clockwise direction, turn these and isolate water to the pump. In the event that you encounter difficulty in turning these, it is possible that your central heating system needs draining. Follow these step-by-step instructions on how to drain a central heating system.

4. Using an adjustable spanner, close the two valves. Some dripping water can be handled by using rags and a bucket placed beneath the pump. Also consider a rubble sack made out of plastic.

5. Turn the nuts on the pump’s valve counter-clockwise (you may need to use a pair of Stilsons). You will notice water escaping for several minutes. If water continues to drip, draining your central heating system is advisable.

6. Take out the 4 Allen bolts on the body of the pump, and then rotate the pump’s head.

7. The wires and pipework are then reconnected. See to it that all replaced nuts are screwed back on tightly, and there are no leaks.

8. Both isolating valves are then opened, and then the central heating is switched on. The pump should begin to spin. This is evident by taking out the big screw in the middle of the pump. This screw can also be used for bleeding some air from the central heating pump.