As much as we have hot water when we need it and our home is comfortable and warm, we don’t give our boiler much thought, although it is the central heating system.

If, on the other hand, your boiler has begun to produce strange noises, you may be concerned. Continue reading to find out more about when boilers make noises and what you should do about it before panicking and calling an emergency plumber.

1. Check If the Noise Is Coming from the Boiler

This may seem like a simple question, but is the noise coming from the boiler itself? Since your boiler is connected to your radiators by pipes running throughout your home, the sound may appear to come from your boiler but from somewhere else. Remember that sound easily flows through the pipework.

Before continuing, listen and check if the noise is coming from the boiler housing or somewhere else in the central heating system. If you have loud pipes or radiators, you will likely need to bleed your system.

2. Bleed Your Central Heating System

If your boiler doesn’t work correctly, you probably have a problem with your heating system (otherwise, your boiler would be working as it should). You need to make sure that your central heating system is clear to fix this problem. This is called bleeding the system. 

The process of bleeding your system is quite simple, but do not attempt to do it yourself if you are not used to working with radiators. You need to remove the radiator controls from your radiators. Then, you need to fill each radiator with hot water. 

This will clear out any air pockets that may be within the pipework. Once you’ve done this, you need to turn the temperature up on each radiator very high, so the system is running fast.

3. Check the Water Tank

If you have reached the stage of suspecting an issue with your boiler and it is not working correctly, you need to check the water tank. You can check the water tank by looking at the water level indicator on the front of the boiler. 

If the water level is low, you should refill it immediately so that the boiler can resume working correctly.

4. Check the Heating System

If the water tank is full and there is still a problem with the boiler, you should look at the heating system. It may simply be that the heating system is not working correctly. The common problem is that radiators are not at the correct temperature. 

If they are not hot enough, they will not heat the water within the boiler sufficiently to cause the safety valves to open. This means that the boiler will not work correctly. You can check the temperature of your radiators by touching them. If they are cold or lukewarm, you need to bleed your system.

5. Make Sure Your Boiler Is Working Correctly

Before you start to worry about your boiler, it is vital to check that it is operating correctly. If you have the boiler manual or thermostat, you should read it carefully. If you’ve misplaced or don’t have the manual, you can find instructions online.

Many modern boilers will have a diagnostic function built-in. Sometimes you have to press a button to run this function. If you can hear beeping sounds when this button is pressed, then you know that the boiler and its thermostat are working fine. 

If you have a clued-up boiler, then it is even easier. Look at the front of the boiler and check the LED display. If the display shows all green lights, the boiler is working correctly. If you cannot find any error codes and you are still worried that your boiler is making strange noises, it is time to call in the experts.


Finally, if you have completed all of the previous steps and still suspect that your boiler is making strange noises, you should call in an engineer. Boilers are surprisingly complex pieces of equipment, and you may be able to fix the problem yourself. However, it is always better to get someone with experience and training to fix your boiler if you can.

If you need help identifying your problem with your commercial boiler rental, London Climate Hire is here for you. We specialise in installing temporary boiler hire and heater rentals in London and local counties. We’re confident in our skill to get you back to business as usual with a cost-effective and speedy response installation. Give us a call on 0800 270 7006 or email us at