If you're seeing the F73 fault code on your Vaillant boiler, you're dealing with a water pressure sensor issue that's causing your system to shut down. This safety feature kicks in when your boiler pressure drops below 0.6 bars, protecting your system from potential damage. While you can check the pressure gauge yourself (it should read between 1-2 bars) and try a simple reset by turning the boiler off and on, this fault often needs professional attention. Given the complexity of pressure sensor problems and potential safety risks, you'll want to explore what a Gas Safe engineer can do to get your heating back up and running.
Key Takeaways
- F73 fault code indicates a water pressure sensor signal problem, triggering when boiler pressure falls below 0.6 bars.
- Common causes include faulty pressure sensors, wiring issues, system leaks, and problems with water supply pressure.
- Quick troubleshooting includes checking the pressure gauge (ideal range 1-2 bar) and adjusting pressure using the filling loop.
- Only Gas Safe registered engineers should repair F73 faults due to safety risks and technical complexity.
- Regular maintenance checks and monitoring pressure levels can prevent F73 faults from occurring.
What Does The F73 Fault Code On A Vaillant Boiler Mean?
When your Vaillant boiler displays the F73 fault code, it's indicating a problem with the water pressure sensor signal. This common sensor malfunction happens when your boiler's pressure drops below 0.6 bars, which isn't good news for your heating system.
Think of your boiler's pressure sensor as a watchful guardian – it's constantly monitoring the water pressure to keep your system running safely.
When it can't communicate properly with your boiler's brain (the PCB), whether due to damaged wiring or a faulty sensor, your boiler will shut down to protect itself.
While this might be frustrating, it's actually a vital boiler maintenance feature that prevents costly damage to your system's internal components.
Don't worry though – it's a problem we encounter often and can usually fix quickly.
What Causes The F73 Fault Code?
Several common issues can trigger the F73 fault code on your Vaillant boiler. When you're dealing with this frustrating problem, it's usually related to how your boiler monitors its water pressure.
Let's look at the main culprits that might be causing trouble in your home.
- A faulty pressure sensor could be misreading your system's pressure levels, which is like having a broken thermometer – it just can't give you accurate readings.
- Wiring issues, including disconnected or corroded connections, might be preventing proper communication between your sensor and boiler.
- System leaks, whether they're small or large, can throw off your pressure readings and trigger this fault code.
Understanding these causes helps you know what to look for when your boiler starts acting up.
How Do You Fix The F73 Error Code On A Vaillant Boiler?
The F73 error code on your Vaillant boiler can be fixed through a systematic approach, starting with basic troubleshooting steps before moving to more complex solutions.
Begin with these simple boiler maintenance tips: first, try resetting your boiler by turning it off, waiting a minute, then turning it back on.
Next, check your boiler's pressure gauge – it should be between 1 and 2 bar. If it's too low, you can adjust it using the filling loop.
When these troubleshooting techniques don't work, it's time to look for signs of water damage or wiring issues.
However, we'd strongly recommend not going further with DIY fixes, as this could be dangerous. Instead, you'll want to call a Gas Safe registered engineer who can properly diagnose and repair any internal leaks or faulty pressure sensors.
Get Your Vaillant Boiler F73 Problem Repaired By A Professional
Ready to fix your Vaillant F73 fault code?
Book your repair appointment now with a Gas Safe registered engineer.
Click here to schedule your boiler repair and get your heating system back to peak performance.
Our qualified engineers are equipped to diagnose and resolve your F73 fault quickly and efficiently, with appointments available at your convenience.