If your boiler has stopped working and the Vaillant F24 fault code is being displayed, you’re in the right place. This common problem scares homeowners often, but diagnosing and fixing it doesn’t have to be traumatic — especially with expert advice. PlumbGas365 have provided fast and professional service to all types of boiler problems throughout the UK for over 10 years.
In this guide, we’ll discuss everything to know about the F24 error code, what leads to it, and pragmatic actions you can take to either fix the problem (or when to call in a professional). So if you want clear explanation without the jargon, step right up.
What Does the Vaillant F24 Fault Code Mean?
If you see the fault code F24, this means that your boiler has a fault affecting the water circulation—or, in other words, your boiler is having trouble controlling the applied temperature of the heating system. When this occurs, your boiler will lock out to safeguard against more serious damage.
What Does It Mean?
Here’s a straightforward guide to what the F24 code usually indicates within your heating system:
- Low water pressure: There may not be enough water in your system for it to circulate.
- Malfunctioning pump: The circulation pump may be malfunctioning, preventing the water from circulating through your system.
- Thermistor problem: A malfunctioning thermistor (temperature sensor) can lead to incorrect temperature readings, resulting in the error.
- Blockages: Sludge can build up in the pipes or the radiators, preventing water from circulating.
Reasons for the Vaillant F24 Code
Knowing the reasons for your boiler showing the F24 code will enable you to tackle the problem better. These are the most common causes of this fault code:
1. Low Water Pressure
Low water pressure is a common culprit for heating problems and an F24 fault. Boiler solutions need constant pressure to work correctly. This code indicates that the boiler is on and the pressure has dropped below the minimum level (typically 1.5 bar).
2. Pump Failure
The pump in your boiler is essential for pumping hot water round your radiators and taps. If there is a fault or air build-up in the pump, circulation will stop, and you will see the F24 fault code!
3. Clogged Heat Exchanger or Pipes
Over time, sludge, debris, and limescale can accumulate, restricting the water flow in your heating system. Blockages lead to inconsistent temperature readings and circulation problems, which can lead to error codes F24 and the like.
4. Faulty NTC Thermistor
The next on the list is the thermistor, which keeps an eye on your boiler’s water temperature. However, if it burns out, it can send incorrect readings to the boiler’s PCB (Printed Circuit Board), causing the system to shut down.
How to Repair a Vaillant F24 Fault Code
Some aspects of troubleshooting an F24 problem require expert attention, but there are initial diagnostic processes you can easily perform on your own to troubleshoot the fault.
1. Inspect the water pressure of your boiler.
Find the pressure gauge on your boiler. You want it to read between 1.0 and 1.5 bar.
If the pressure falls below 1.0 bar, you need to top it up (check your manual for how to do this).
2. Inspect the Heating Pump
Listen for strange sounds, like humming or grinding, which could be a sign of pump failure.
It is up to you if you feel comfortable checking that the pump isn’t airlocked—bleed the system carefully to release trapped air.
3. Look for Blockages
Some radiators are cold, some warm? This uneven heating may indicate the accumulation of sludge or obstructions in the pipes.
Inspect your radiators and pipework for visible signs of wear or buildup.
4. Reset the Boiler
A simple boiler reset sometimes can cure temporary glitches. Find the reset button (check your boiler manual), and press and hold it down for as long as needed.
Still seeing the F24 code? It’s time to bring in a professional.
How To Fix Vaillant F24 Fault Code
If your initial checks haven’t solved the problem, a Gas Safe-Registered engineer such as PlumbGas365 can get involved and make more complex repairs to your gas system. What we usually do to fix the F24 fault code professionally
Refill or Repressurize the System
We will adjust the boiler pressure per the manufacturer’s specifications. If the pressure continues to drop, there may be a leak in the system, and we can find and repair it.
Repair or Replace the Pump
When your pump can’t be easily repaired, we’ll install a top-quality equivalent to bring full circulation back into your home again.
Power Flush Your System
Our flushing services draw out sludge and other grinding debris so that hot water can run freely through your heating pipes and radiators.
Replace Faulty Components
If the thermistor or PCB are faulty, we’ll replace them with manufacturer-grade parts for dependable performance going forward.
Why PlumbGas365 for Boiler Repair Services?
Gradient-At PlumbGas365, we offer you over 10 years of experience with service that is professional, reliable, and nationwide. We’re known for our speed in diagnosing boiler faults and providing long-term solutions at competitive rates.
When you choose us, you get:
Gas Safe Registered Engineers: Experts on Vaillant and other major boiler manufacturers.
National coverage: No matter where you are in the UK, you’ll have our full support.
A flavor of the channel is the transparent and honest pricing: No hidden fees, just fair and quality-driven service!
Quickly Protect Your Boiler
This is not a fault code that can be ignored, the Vaillant F24 code. If left unrepaired, it can develop into a worse problem, causing expensive repairs in the future.
Save yourself time and money and contact those that know best—contact PlumbGas365 at 01522 874096. We have the expertise to get your boiler up and running, no stress.
