You may never have considered how your heating system actually works - you turn the heating on and your radiators get hot. But there are a lot of mechanisms that work together to ensure your home stays warm throughout the winter. One such device is a central heating pump. The heated water gradually cools down as it moves around the system. The pump delivers the water back to the boiler where it can be reheated.
The pump works by pressurising the water with impellers and delivering this around the system. Your pump will have a water flow inlet and an outlet.
The inlet is where the hot water enters to be pressurised and the outlet is where the water exits to flow around your home. The diameter of the inlet and outlet will determine the flow rate of the water. Depending on the kind of pump you have, there may be a pressure dial so that you can increase or decrease the pressure of the water in your central heating system.
The dial is there so that the pump can be installed into any size home with any number of radiators. The pressure is increased for large homes and decreased for smaller properties. Most pumps come with three settings so you can determine which pressure is best for you. If you notice either of these things, you should call a suitably qualified engineer to have a look at the pump. As a pump propels the water around your heating system, it can begin to get quite hot.
In a wet rotor pump, the rotor is surrounded by water. There are lots of benefits to having a wet rotor pump. It runs very quietly so you can hardly hear it and it provides a more consistent pressure in your radiators and pipes. This is because the hot water that is supplied to your taps and showers is at mains pressure. A small amount of water will escape when you do this, so be prepared to catch it in a bowl.
Tighten up the nuts, and then open the valves and check for any leaks before proceeding. If everything is right and there are no leaks, you can connect the new pump to the electrical supply and turn the system back on.
If it does, you need to consult a plumber. Pump Bleed Screw If you find that your pump is not working correctly, then one common reason is that air bubbles are trapped inside the pump. This stops the impellers working correctly and can cause an odd, random banging noise. Following manufacturer instructions, the pump bleed screw helps you bleed this air out of the system. Electrical Connections This is where you can manage the pump's electrical configuration.
Again, read the manufacturer instructions before use. Electricity Supply Cable This is where you connect the pump to mains electricity supply. Each home is different, and the location of your central heating pump will be determined by the location of the boiler or the expertise of the plumber who installed it. One of the great things about central heating pumps is that they only use electricity when you switch on the central heating system.
Most domestic central heating pumps run on about volts, which is about the same amount of power needed to operate a kettle. Saying that, your central heating pump is unlikely to be on full power. One of the most common questions we get here at Anchor Pump is: How do I choose the correct central heating pump size for my home.
If you have a much larger home lucky you then it does get a tad more complicated. In most cases, you will need a visual inspection of the pipe sizes, type of radiators, boiler size etc. As with most things in your home, issues will no doubt crop up with your central heating pump. If you are not confident in dealing with the issue then please contact a central heating technician to assess your system.
A pump that has been installed incorrectly will have an impact on your central heating system. Not only can the rattling have long-term wear and tear consequences on your pump, but it can also stop your pump from working efficiently.
Fix: Check the pump fittings. If you find any loose screws or bolts then tighten them. Not to be confused with noises coming from your pump, alternatively, you could be hearing a general humming or knocking noises coming from your wider central heating system.
This could be a sign that air has entered into your pump. As with all machinery, you should expect a small amount of vibration and noise. If your pump is making no noise and the central heating is failing to distribute heat evenly around your home, then you may have a jammed Impeller.
Foreign bodies can sometimes enter the water supply that can affect the running of the pump. If the central heating system is not activating the pump or a fuse has gone then your pump will not start. In some circumstances, the fixes listed above may fail to resolve your problem. Internal corrosion is common in central heating pumps, and in this instance, you will need to replace your pump.
While we advise calling a qualified central heating technician before replacing any equipment yourself, there are some circumstances where you can be confident your pump needs replacing. Generally, a hardworking pump will a be a tad warm, but if your pump is getting too hot to touch, then it may be a sign of severe damage.
In this case, you may need to check the warranty of your pump provider, but generally, you will need to replace the pump. If your pump is making a grating or knocking noise, then this could be a sign of severe damage inside the pump. Again, check your warranty with the pump provider. A malfunctioning central heating pump can cause a range of problems with your entire heating system, including leaks, excessive noise, cold radiators, and more.
Otherwise, read on to find out more! A central heating pump in a central heating system takes hot water from the boiler and pumps it around the pipework in your property. This feeds the radiators, taps, towel rails and showers in your property.
If a central heating pump is not working, it can wreak havoc on your whole heating system. Often, a noisy central heating pump is the telltale sign that something is amiss. If you have a regular or system boiler, the central heating pump will be located next to the boiler, or in an airing cupboard.
The tap water already gets supplied at mains pressure, whilst combis typically have an integral pump to circulate water through your radiators. If the central heating pump is running, then it should be vibrating slightly. The most likely cause of this problem is that the shaft or propeller on the pump is stuck. If a component on the pump is stuck and the pump is not circulating water, sometimes a gentle tap will free up any seized components.
Check out our related article covering heating and boiler problems here. As central heating systems age, dirt and metal particles from radiators and pipework break down and begin to flow through major components such as the heating pump. This dirt and grime builds up in major components in the boiler and causes them to fail. Luckily, pump blockages are quite easy to fix, as all it requires is a little bit of cleaning. The first point of call would be to hot flush the heating system with chemicals.
Increasing the pressure on old systems can weaken joints and components and cause leaks. The magnetic system filter will catch a lot of the debris and help to prevent any future heating pump problems.
Always ask an engineer to check the heating pump when they come to do an annual boiler service. Another common heating pump problem is air locks. If air builds up in the pump, the pump will stop working correctly. Many central heating pumps have a bleed screw that can be used to remove the air, and allow the pump to work again without replacing any internal parts.
A lot of customers complain of a constant humming noise when airlocks are the problem. Please bear in mind that the pump is full of water. Open the screw extremely slowly less than a quarter of a turn will usually be enough as there is likely to be a small amount of water leaking out of the pump once all the air is bled.
Some manufacturers supply anti vibration brackets which are easy to install with the right tools. Get a FREE fixed quote with finance options. Not all heating pump problems can be blamed on the pump. In a worst-case scenario, the original installer fitted the pump the wrong way. This is extremely uncommon, but if the pump has been fitted incorrectly, then it needs to be switched around.
Remember, you must drain the system before removing and turning the pump. They are extremely easy to adjust. And usually they are between 1 and 3. On many properties, we have been to that have had radiators not getting hot, or the whole system not getting to temperature, the pump flow rate is the issue.
Locate the boiler pump. On top of the pump will be a switch. You can flick the pump to 3, which is the most powerful setting. Boilers leak for a whole host of different reasons. One of the most common reasons that a boiler leaks is issues with the pump.
This can be down to incorrect installation, the pump working itself loose, or even a blown seal due to incorrect pressure settings.
Check that the pump is secure. Check all the fittings on the pump. Corrosion maybe the cause of the water leak. Finally, check the joint on the pump. The two options here are to replace the seal, or replace the pump.
If the pump is particularly old, a replacement is the best option. Read our guide on boiler installation costs , or go ahead and request a replacement here. If the pump and boiler have no power , but your property has power, the likely cause is going to be the PCB unit. Hopefully, your boiler has power.
On some occasions, small leaks can ruin the wiring on the pump. First, start with the easy and obvious. Like other appliances pumps have fuses.
Also, check that are no leaks. Prefer a new boiler with a long warranty? Get your price online using this clickable form. Most pump problems are related to pumps not working. A proper pump diagnostic needs to take place.
Like any other mechanical device, a central heating pump can succumb to wear and tear associated with age. You can expect the pump to become worn out after about 15 years of service, but some can last as long as three decades. You can learn more about replacing central heating pump services, and the expenses you can expect, by clicking here. Whether you have a noisy radiator, a boiler making loud noise like running water, or you simply suspect your old central heating pump has gone, a fix is close to hand.
Read our guide carefully for a solution, or else reach out to a professional to help if nothing is forthcoming. Could you please advise me on correcting a problem on why the central heating pump continues to run when both heating and hot water have been switched off at the controller.
Many thanks Howard Evans. It needs a diagnostic, but a good start is checking the pump is communicating properly with the PCB via the heat sensor.
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