your boiler making a whistling sound. Now imagine hearing this sound continuously
for hours. This would probably not be as good as it looks like.
might be wondering as to why is my boiler whistling? Boilers are something that
are most of the time taken for granted for as long as it is working properly,
none of us would even mind to think about its maintenance. However, things can
turn off from time to time, and the first sign that comes to the notice is an
unfamiliar or unnoticed noise.
your boiler begins to make noises, you should understand that it needs to be
looked upon as there is something that is interfering with the operation of the
Why is my boiler whistling?
From our understanding of boilers there can be 3
main problems that happen to be the reasons of your system making a whistling
whistling sound from a system can either be an outcome of kettling or the
trapped air within the system.
- Kettling is something which occurs as a result of the lime scale
buildup in the system that eventually creates bubbles and leads to the occurrence
of ‘hot spots’. These hot spots are what
causes loud noise and needs to be treated with a solution in order to clear the
lime scale blockage.
- The other reason could probably be the air that gets trapped in
your system and simply needs to be released out. While if the problem is that
of the air being trapped then it can simply be repaired by releasing the
trapped air from the system through the process of bleeding.
- However, this sound of whistling can also be a cause of the loss of
water pressure or a blockage. It might be the case in which there isn’t enough
water flowing through the system due to the low pressure. That is why your
boiler is whistling when hot water is on. You need to look at the pressure
gauge to check the pressure. If you find the pressure to be lower than one bar,
then you would need to repressurise the system.
you know about why is my boiler whistling, you might be wondering about how
would you stop the boiler from making such noises.
- Check the water pressure- If the water pressure is too low then it
might be the culprit of your whistling noise. Have a look at the pressure gauge
that is located in the area where the pipes are connected to the boiler, in
order to check on the pressure of water in your boiler. If the pressure is
below one bar then you would need to top up the pressure and increase it until
it gets restored to the correct level. For this you might need to consult the
manual or a professional help.
- Bleed the system- In many cases the sound from the boiler is a
result of the air trapped in the system that needs to be released out. That is
probably when you would need to bleed the system that can be done in a few
- Fully open all radiator
thermostats and run the heating at full temperature for 10-15 minutes with all
- Now simply turn the
circulation pump off and wait until the radiators get cooled. This would require
minimum of 30-60 minutes.
- Bleed the radiator that is
located near the boiler using a bleed key or a screwdriver until the water
- Repeat this for each radiator
- Turn on the boiler and check
the water pressure and you are done with process.
a clear note these are not the only issues that cause a whistling sound in your
boiler but these are some of the most common reasons that happen to disturb
your peace of mind.