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How to Change a Central Heating Pump: 8-Step Guide

Whenever your central heating pump malfunctions, a lot of heating problems occur.

It is vital to react promptly to avoid any further wastage of energy.

No one has to suffer unnecessary discomfort.

Change the faulty central heating pump at home at no extra cost. It is not difficult to get this done without the assistance of a professional technician. You will possibly save a few dollars doing so as a DIYer.

Gather the necessary tools and follow a few straightforward prompts.

Tools Needed to Change the Central Heating Pump

Reconnecting or fixing your central heating system requires you to use the right tools. Fortunately, the tools are affordable and easy to find. Get them at the nearest DIY shop or retailer near you. Get the right sizes for the task.

The tools include:

  • Bleed key
  • Pliers
  • Adjustable spanner
  • Electrical spanner

How to Install a Central Heating Pump: 8 Steps to Follow

Similar steps apply when changing or installing a new heat pump. First, use the tools to get to the pump’s location in the airing cupboard.

Step 1 – Start by Shutting Off the Electric Collection and Water Supply

In the case of an existing pump, switch off the electric and water source from the mains. Also important is to take a photograph of the initial pump. This will be a reference, especially if you get confused about the wiring.

Next, take off the electrical cover. Pull the cable from the connection box after releasing the wires from their connection. These are the neutral, earth, and live connections. Put different colored tapes on each of the wires to avoid confusion or switching them up. With this, pull the cable from the pump.

Step 2 – Close Water Valves on Either Side of the Pump

Find the gate valves, also known as the pump valves, and shut off the water to the pump. Use the pliers you got earlier, turn the valves in a clockwise direction, and tighten them. It may not work without the pliers.

Step 3 – Drain all the Water from the Pump

Exercise caution with this since it can get messy since the pump may still contain some water in it. Find the bleed screw in the middle of the pump and get it out, as this should allow the pump to drain. Get towels and place them under the pump as you unscrew them to drain the water.

Step 4 – Get the Old Pump Out and Fix the New One

At this point, removing the old pump and fixing the new one is easier. Add the washers in their place, preferably going for the newer ones. Please ensure the new pump seals are appropriately fixed and connected to the valve.

Step 5 – Tighten the New pump to the Valves

Tighten nuts on both the inlet and outlets. Confirm that connecting nuts are tight and that no leaks occur. Be sure not to overdo it since excessive tightening may cause serious consequences.

Step 6 – Test the Pump for Leakages

Turning the valve anticlockwise helps ascertain that there are no leaks. This test can help determine whether the nuts are tight enough. Tighten harder in case there is a need to. Only then should you turn on the water.

Step 7 – Water Supply Reconnection

Reconnect the water supply confidently at this stage. Open the isolating valves and check for leaks. Once done, tighten and connect the relevant nuts. You proceed to the next electrical phase when you are sure of no leaks.

Step 8 – Fix the Electrical Wiring

The final/ most dangerous step is electrical reconnection. Only proceed if you are confident that no water will leak. Check the photo you took at the beginning and reconnect the wires appropriately.

If you are unsure about this, hire a professional electrician to assist. The last thing you want is an electrical accident. When everything checks out, switch on the power and check if the pump works. Turn on the thermostat to crank up the central heating unit, and everything will fall into place.

Complete this installation process by bleeding the system to ensure no air trapping. I advise bleeding the radiators too. This confirms that the new pump works perfectly and ensures everything balances. Stick to the steps, and your new pump will work perfectly. Always prioritize safety in all this.


Is it easy to change a central heating pump?

Although it sounds intimidating, replacing a central heat pump is not complex. A competent DIYer needs a few tools to complete the task. What matters is following the proper steps.

What are the symptoms of a faulty central heating pump

You can always tell when the central heating pump breaks down. I would advise that you watch out for typical symptoms, which include:

  • Dismal heating performance is when the system takes too long and fails to heat properly.
  • Unexplained noises from the unit
  • The heat coming from a few of the radiators only
  • The boiler control panel is not working as it should.

Can I replace my heat pump myself?

Yes, you can. Be sure to get the right tools, read about the pump, and spare some time to get this done. It will save you a significant amount of money that would otherwise be the technician’s fee. You will need at least 3 to 5 hours to complete it.

What is the most common reason for pump failure?

Heat pumps break down for a variety of reasons. One of the most common is poor lubrication. The other common reason is that the bearings may fail when the temperatures drop or overload.

How long does it take to fit a central heating pump?

On average, this process may take about 4 hours. However, you must be diligent and good with the tools, or it may take longer. Professionals may handle it in a shorter period.