New and modern boilers require constant water pressure to function correctly.Â
Most boiler systems operate efficiently between 1.0 and 2.0 bar of pressure. If the pressure drops below 1.0, your boiler may start to struggle or shut down entirely.Â
So, if your boiler is losing pressure, it’s definitely something to take seriously. It’s crucial to investigate, identify, and resolve the issue promptly to not only protect your boiler but also to prevent potential damage to your home.
While it’s relatively easy to spot when pressure is dropping, pinpointing the exact cause is often more challenging due to the complexity of domestic heating systems. In most cases, the issue comes down to a water leak somewhere in the system or a faulty component, such as a pressure valve.
In this blog, we’ll explain why boiler pressure is important, the common causes of pressure loss, and what signs to look out for.
Why is Boiler Pressure Important?
Boiler pressure is essential for your boiler to push hot water through to your radiators and pipes to heat your home effectively. Maintaining the correct pressure (between 1.0 and 2.0 bar) ensures your boiler runs efficiently and safely.
Low pressure can be a warning sign of an underlying problem, such as a leak or a faulty part. Left unresolved, it can lead to reduced performance, system damage, and higher energy bills. Taking action early helps to avoid long-term issues and keeps your home comfortable.
Signs Your Boiler is Losing Pressure
Whilst there are some tell-tale signs as to why your boiler is losing pressure, some are not so obvious. To help you identify the issue early, we have listed some signs to look out for.
Your Radiators are Cold at the Top
If your radiators are warm at the bottom but cold at the top, this could be an indication that the air in the system or low water pressure prevents proper circulation. While bleeding the radiators might help, the issue could be recurring if pressure loss is the main root of the cause.
Boiler Error Codes (e.g. F22)
Most modern boilers have digital displays that will show fault or error codes. Some common pressure loss codes are E119, F1 and F22, which signals low water pressure or no water in the system. If you’re seeing an unfamiliar code, it is best to call a professional for full diagnostics.
Frequent Need to Top-Up Water
Having to regularly use the filling loop to increase the boiler pressure is a strong sign that something is wrong. While an occasional top-up is normal, doing this weekly or even monthly suggests your system is losing pressure far too quickly.
Gurgling or Banging Sounds
Unusual noises like gurgling, bubbling, or banging coming from your boiler or radiators often indicate air pockets, which are caused by low pressure or trapped air in the system. These sounds can also point to a build-up of limescale or sludge, which can compromise performance.
Visible Drops on the Pressure Gauge
This is the most obvious sign, if your pressure gauge frequently reads below the 1.0 bar, it means your system is under-pressurised. Keep an eye on it for sudden drops after heating use or overnight when the system cools down.
Hot Water Cutting Out Intermittently
Inconsistent hot water can also be a clue to loss of boiler pressure. If it drops too low, the system may shut off to prevent damage, leaving you with either lukewarm water or none at all until it’s reset and repressurised.
Has my Boiler Lost Pressure Due to a Water Leak?
As mentioned earlier, identifying leaks in modern boilers can be tricky due to how complex the systems are. However, water leaks are one of the most common causes of pressure loss. Leaks usually occur at joints, fittings, or worn-out seals, which are often visible with a close inspection.
Georgio’s offers expert leak detection services that use non-invasive techniques to locate the issue accurately saving time, money, and disruption.
Can I Lose Boiler Pressure Due to a Fault?
If you believe that your boiler is not leaking, then it is most likely the boiler itself that is at fault. Combi-boilers in particular, use a system known as ‘filling-loop’ which is to maintain the cold water pressure from the mains supply. This system allows you to restore the pressure in your boiler and heating system.
When to Call Georgio’s
Whilst some pressure drops are minor and can be easily fixed at home, there are several instances where calling in a professional is the safest option. If you are still experiencing rapid or frequent drops in pressure, an error code is displayed on your boiler, or there are signs of leaks around your property, we highly recommend you reach out for assistance.Â
At Georgio’s, our staff have training, tools, and experience to quickly identify and resolve pressure loss issues, helping you avoid further inconvenience or costly repairs.
