Reasons for air trapping in the central heating system, and how to fix it

So you’re thinking your central heating is not warming up as it should be or that there are bubbling noises coming from the radiators? Cold radiators? It could just be air caught in them. When this happens, they’re less efficient and don’t do their job properly which can get pretty chilly during the winter months!

The problem with air caught up in central heating radiators is easily fixable, but before providing the solution to this issue here are a few reasons why it happens.

You probably heard it already: Airlock

When the vapour is trapped in a central heating system. Then prevents water from passing into the radiator. This leaves the device cold.

Let’s start with the reason. Why does the air build up in the system?

  • The buildup of air can be due to a variety, such as installing the pump above the supply tank and rust in piping.
  • If there are leaks or constant pressurizing of boilers then this can cause an accumulation of hydrogen which will lead to you having too much sludge and at times even buildup within piping leading pipes with rust on them!
  • There are a number of other signs that indicate an airlock in pipes. One common sign includes no hot water from taps or showers, and the other is cold spots on one or more radiators.

A noisy radiator is a common problem, but it’s easy to fix. The most likely cause of the noise coming from your home heating system has nothing at all to do with how well or poorly you maintain everything else. ( except the boiler)

A solution for this issue starts by noticing if there are any restrictions when installing ductwork. 

What to do?

You can easily solve the problem of trapped air in your central heating system by bleeding the radiators – watch the video below to find out how. 

For your own safety, it is important not to scold yourself (wear protective gloves and clothing) when you come in contact with hot water. You should also protect the floors!

How to remove air from the heating system – Noisy Central Heating

Bleed your radiators! When there’s a cold spot in your heating system, the first thing you should do is bleed all of its radiators. This will force any airlocks out and make it possible for them to be removed easily with no further complications later on down the line! It will have you feeling like new again and save money in the process.

Before you start the DIY – Think wise

Dripping taps is so common that it’s rare to find someone who hasn’t experienced this issue. Drippings cost you money, and they can push up your water bill too! A single tap may waste hundreds of litres over the course of a year with just one drip per second where does all that go? Either you decide to change the One of the most frustrating feelings in life is dealing with an issue only to find out there’s something else going on. This can happen when trying to clear a water heater airlock and fail miserably, which leads me down my long list: “What now?”. Before giving up hope altogether though – consider calling upon some heating engineers!

What to use for the process?

Before you start reducing the air in your central heating system, be sure to bring with you these items:

  • Bleeding key
  • Dry towels
  • Bucket

How to…

  1. If you want to know more about bleeding radiators, we have a full guide for that. However, here’s what happened in this short excerpt:
  2. Turn off your central noisy central heating system, and wait until it’s cooled down. This is about 20-30 minutes.
  3. You will need some towels, just in case, in order to avoid patches on your carpet around the radiators. Water might escape during the process. 
  4. With a help of your bleeding key, radiator key, start slowly opening the radiator valves, anti-clockwise. When doing this, you must hear the air coming out from the system.
  5. When you can’t hear this hissing noise anymore, you can turn the valves back into the exact same position as they were.
  6. Check your boiler pressure.
  7. Turn the heating on, and check the results of your work. If your radiators are evenly hot, you did it!

This guide has helped you to get your central heating radiators working like new again. Once completed, they will be free from air build-up and able to function as normal.

FAQ – Frequently Asked Questions

How do I know if my noisy boiler is faulty or air is trapped inside?

There are some common signs which we mentioned above, but in order to be 100% sure, you need a visit from a qualified heating engineer or boiler engineer if it is a boiler issue.

How can I use the bleed valve to remove trapped air inside? I have a combi boiler.

We have this article to help you, how to bleed out the radiators step by step. If you are not confident with your hot water system, ( heating) we recommend calling a professional.

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