How to Replace a Central Heating Pump
One of the most common causes of failure in central heating systems is the pump. It's a mechanical component and it works hard, so it's no wonder central heating pumps need to be replaced from time to time. Symptoms of failure may be excessive noise or the fact that some of your radiators aren't getting warm.
They might be hard to get at due to their location in airing cupboards or similar places, but changing a pump isn't that difficult. If you're in any doubt, however, do consult a professional.
The Right Tools
As with any job, it's necessary to have the correct tools. For changing central heating pumps you'll need a pair of large adjustable spanners or wrenches; you may also need a screwdriver to deal with electrical connections.
You also need a replacement pump, of course, and you'll find a good range of central heating pumps on offer here at Anchor Pumps. Make sure you get the right type for your system; the specifications will usually be on a label on the old pump.
Doing the Job
Start by turning off the electrical supply and disconnecting the electrical connection from the pump. There will be inlet and outlet valves on either side of the pump; use an adjustable spanner to close these by turning them clockwise.
Now undo the nuts connecting the pump to the pipework, being careful not to disturb other connections. You'll need a paint roller tray or similar to catch any water. Now you can remove the pump.
Put the new pump in place, replace any washers - it's best to use new ones - and re-tighten the nuts. Be careful not to over-tighten them and damage the threads. Now you can reconnect the electrics, open the valves and test the pump. There will be a bleed screw on the pump to allow you to get any air out of the system.