skip to Main Content
All grants are subject to availability
Central Heating Pump Noisy Issue

Why is my central heating pump noisy?

A central heating pump is a component located near the boiler, that pushes the hot water to the radiators. This article will take you through the common causes of a faulty central heating pump. If there is a problem with your pump, then it could lead to cold radiators and even leaks.


The typical reason, behind a humming sound coming from your central heating pump, is a blockage, which is caused by trapped air. To get rid of, what is commonly known as an airlock, the pump bleed screw needs to be turned to release the excess air.

Pump shaft incorrectly installed

If a central heating pump has been installed incorrectly, it will result in a whole host of problems. The pump needs to be fitted horizontally at a specific angle, if not, then the pump’s performance will be negatively impacted. If you find yourself in this situation, then it is important that you contact a Gas Safe registered engineer, as a pump installed in the wrong position will wear out much sooner.

Dirt blockage

Naturally, when water circulates around the central heating system, it brings rust, sludge and other debris with it. As time goes on, this gradually builds up and can turn into a blockage.

Luckily, to fix this, the blockage can easily be cleaned away. To stop the central heating system from being blocked again, a heating engineer can perform a powerflush. This procedure sends chemicals around the system to clear it out.

You can also have a magnetic filter installed, to collect debris before it has a chance to form a blockage.

Speed set too high

Nowadays, central heating pumps come with settings, that allow you to change the flow rate. There are usually three different speeds. If the speed is set too high, you will have a noisy central heating pump. Instead of changing it instantly, you should contact a professional, because there might be a valid reason your pump is set to that speed.

Fan hitting other parts

Central heating pumps tend to have a fan fitted alongside them, to stop them from overheating. A metal clanking sound when the pump is in action indicates that there is a problem with the fan. The most likely cause of this is a loose blade.

Seized internal parts

If there is humming or vibration coming from the central heating pump, then this is a sign that certain parts have seized up. In some instances, a light tap could be enough to solve the problem, however, it is more likely a blockage or a sign that the pump has been installed incorrectly.

Pump overheating

When the central heating pump is in motion, it is normal for it to heat up slightly. If the pump becomes too hot to touch, then there is probably a problem with the motor. Usually, a fault occurs when the central heating has been switched off for a long time. The reason for the motor overheating, can generally be put down to a part getting stuck. Quite often, this can be solved with a light tap, although, if this is a recurring issue, then it is probably time to have your central heating pump replaced.

Worcester Bosch Boiler

Homeowners are still able to get a FREE boiler grant or insulation grant via the ECO scheme, which is still available to households that qualify. Warma UK are currently working throughout the UK helping privately owned and rented homes to improve home energy efficiency and save money on rising energy bills.

For more information email –

Or call 03304600065

Apply For Your Government Backed Heating Grant

Following your successful application, we will arrange a free, no obligation survey to ensure the maximum grant is obtained and advise you on the best products to reduce your homes energy usage.