Baxi E118 Fault Code: What It Means & How to Fix It
The Baxi E118 fault code indicates that your boiler’s water pressure has dropped below the safe operating level typically under 1.0 bar causing it to shut down. This common issue is usually quick and simple to fix by repressurising the system using the boiler’s filling loop. Most homeowners can safely resolve it themselves in just a few minutes. This guide explains the causes, symptoms, and step-by-step instructions to get rid of Baxi E118 error code.
Table of contents
What Does the E118 Fault Code Mean?
The Baxi E118 fault code indicates low water pressure in your heating system. For safety, the boiler automatically shuts down to avoid damage. You’ll usually see this error if your pressure gauge is reading under 1.0 bar.
A healthy boiler pressure should sit between 1.0 and 1.5 bar. When pressure falls too low, your system can’t circulate hot water efficiently, leaving you without heating or hot water.
Common Causes of the Baxi E118 Error Code
Several things can cause the E118 error code to appear, including:
- Bleeding radiators (which releases water and air)
- Leaks in the system (even small ones)
- Recently drained systems not properly refilled
- Faulty pressure relief valves or expansion vessels
- Microscopic leaks that slowly reduce pressure over time
Routine boiler maintenance and occasional checks can help you catch pressure issues early.
How to Fix the Baxi E118 Fault Code
Time needed: 5 minutes
You can usually fix the E118 error by repressurising the boiler using the filling loop. Follow these easy steps:
- Check the Pressure Gauge
Look at the dial on the boiler. If it reads below 1.0 bar, it’s time to top up the pressure.
- Locate the Filling Loop
This is usually under the boiler or nearby a silver braided hose with black handles or knobs.
- Turn the Valves
Slowly open both valves to let water into the system. You should hear it flow.
- Watch the Pressure Rise
Let the pressure build until it reaches 1.0 to 1.5 bar.
- Close the Valves
Once you’re in the safe pressure range, close both valves to stop the water flow.
- Reset the Boiler
Press the reset button. The E118 code should disappear, and your boiler should fire up again.
When to Call a Professional
If you’ve topped up the pressure and your boiler still isn’t working, or the pressure keeps dropping it could be due to:
- An internal leak
- A failing pressure sensor
- A faulty expansion vessel or pressure relief valve
A Gas Safe engineer can safely inspect and fix these problems.
Conclusion
The Baxi E118 error code might seem worrying at first, but in most cases, it’s a simple fix that involves topping up your system’s pressure. Keeping an eye on your boiler’s pressure level is an easy way to ensure your home stays warm and your system runs efficiently.
Frequently Asked Questions
The Baxi E40 Fault Code is triggered when there’s an issue with the central heating return NTC sensor, a key component that monitors the temperature of water returning from your radiators. Here is full guide on Baxi E40 fault code
To reset a hot water boiler, locate the reset button on the control panel. Press and hold the button for 10 seconds, then wait a minute to see if the system resumes normal operation. If the error persists, repeat the process.
Your boiler restart button, also referred to as ‘lock out’, is located on your boiler burner unit. Usually, the burner unit front door cover will need to be removed to gain access to the control box reset (when ‘tripped’ the button is normally illuminated).
