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Combi boiler pump failure symptoms


The combi boiler pump is responsible for circulating water around the heating system. It is a vital component of the boiler. If the pump fails, this could cause several problems, including no hot water, central heating, or leaks. It is essential to identify boiler pump failure symptoms so that you can take action to resolve the issue as quickly as possible. This article outlines the most common combi boiler pump failure symptoms that our team at Boiler Solutions put together. We seek to ensure that you remain updated and in the loop with fresh content about boilers and other topics. You will be able to familiarize yourself with common fails that we are bound to come across when it comes to boilers. If you reside in North London and are in search of a new boiler, you may refer to our boiler installation North London service page to explore the services provided by our boiler engineers.

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Combi boiler pump failure symptoms

If your combi boiler suddenly stops working, it may be due to a pump failure. Check out these five common symptoms of a pump failure. If you notice any of these combi boiler pump failure symptoms, you must contact a qualified boiler engineer as soon as possible to avoid further damage to your boiler.

• The boiler makes strange noises

One of the reasons for a pump failure is strange noises coming from the boiler. It can be anything, from a high-pitched whine to a low rumble. If you hear any strange noises from your boiler, it’s essential to check the pump for signs of damage or wear.

• Low water pressure

Another common combi boiler pump failure symptom is low water pressure. If you feel that your water pressure is suddenly lower than usual, it’s a good idea to check the pump for damage. In some cases, low water pressure can also signify a leak in the boiler’s condensate return line.

• The boiler does not produce enough hot water

If your boiler isn’t producing enough hot water, it could be due to several issues. One possibility is that the combi boiler pump has failed. The combi boiler pump is responsible for circulating water around the heating system and is essential for the boiler to function correctly. If you are beginning to experience any of these issues, contacting a qualified engineer is vital to figure out the problem and carry out any necessary repairs. Attempting to repair a boiler yourself can be very dangerous and could result in further damage to the boiler or even injuries. While we’re on the subject, also do check out why you should arrange a hot water cylinder service in a timely manner.

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• The boiler takes a long time to heat up

If your boiler takes a long time to heat up, it could signal a pump failure. The pump is responsible for circulating hot water from the boiler to the radiators. If this fails, then water will not be able to circulate properly and will take longer to heat up. You would also need to be aware of the importance of draining your central heating system at least once a year. Find out more on what to do about this in our blog how to drain down a central heating system combi boiler?

• Water leakage

If you notice water leaking from your combi boiler, it is crucial to determine the source of the leak and whether it is coming from the boiler itself or the pump. Boiler leaks tend to occur due to various factors, including cracked heat exchangers, faulty gaskets, or loose pipes. On the other hand, pump failures happen when there is a loss of power, a broken impeller, or a clogged filter. If you are unclear about the source of the leak, it is best to contact a boiler engineer for assistance. They can troubleshoot the problem and determine the best course of action.

• Heating bills are suddenly higher than usual

If you notice that your heating bill is higher than usual, it could signify a pump failure in your combi boiler. That can happen when the pump fails to circulate the water in the boiler, causing it to overheat and use more energy. To check this, look at your boiler’s pressure gauge. If it’s reading higher than usual, it could signal that the pump is failing.

Can a boiler work without a pump?

While a boiler can technically operate without a pump, it is not recommended. A boiler relies on a pump to circulate the water throughout the system. Without a pump, it will not operate at peak efficiency and could cause long-term damage to the boiler. A boiler relies on a pump to circulate water and transfer heat, so without a pump, the boiler will not be able to function correctly. Additionally, a boiler without a pump would be unable to circulate the water properly, leading to the water becoming stagnant and creating a breeding ground for bacteria. You can also gain a broader understanding about the most common boiler problems in London by checking out a blog we’d created on that topic.

How do I know if my boiler circulator pump is working?

If your boiler circulator pump is not working, there are a few things you can do to check:

  • Check the power supply to the pump. Ensure the pump is getting power and the circuit breaker has not tripped.
  • Check the water supply to the pump. Ensure that there is water in the boiler and that the valves leading to the pump are open.
  • Check the connections to the pump.

Make sure all the connections are tight and there are no leaks. If you have checked all these things and the pump still does not seem to be working, it may need to be replaced. You can contact us at Boiler Solutions to book yourself a qualified engineer to help you with this. You can also check out our video blog on how to replace a boiler circulator pump to get an idea of what to do if it needs replacing.

How do you test a combi boiler pump?

Before testing the pump, it is essential to check the power to the boiler and that the correct fuse has been fitted. Once you have confirmed that there is enough power moving to the boiler, you can test the pump by doing the following:

  • Make sure that the boiler is turned off.
  • Locate the pump. It is usually located near the bottom of the boiler.
  • Remove the pump from the boiler.
  • Connect a voltmeter to the pump terminals.
  • Turn on the power to the boiler.
  • The voltmeter should show a reading of around 240V. If it does not, then there is a problem with the pump.