Baxi Boiler E118 Fault Code Explained

The E118 fault code on your Baxi boiler signals that your system's water pressure has dropped below 1.0 bar, causing your boiler to shut down for safety. You'll typically spot this issue on your pressure gauge, and it's often a straightforward fix. While you can try repressurising the system yourself using the filling loop to bring the pressure back to 1.0-1.5 bar, persistent E118 errors might point to underlying leaks or valve problems. A quick pressure top-up usually gets things running again, but if the issue keeps popping up, there's more you should know about keeping your heating system in top shape.

Key Takeaways

• E118 fault code on Baxi boilers indicates low water pressure, typically below 1.0 bar, causing the system to shut down.
• Normal operating pressure should be maintained between 1.0 and 1.5 bar for optimal boiler performance.
• Pressurise the system using the filling loop beneath the boiler until pressure gauge reads between 1.0-1.5 bar.
• Common causes include system leaks, recent radiator bleeding, or faulty pressure valves requiring professional inspection.
• Reset the boiler after pressurising and contact a Gas Safe engineer if the fault persists.

What Does The E118 Fault Code On A Baxi Boiler Mean?

The E118 fault code on your Baxi boiler signals a low water pressure problem in your heating system. If you're seeing this error, don't worry – it's one of the most common boiler maintenance tips we share with our customers, and it's usually quite straightforward to fix.

Your boiler needs to maintain a pressure between 1.0 and 1.5 bar to work safely and efficiently. When the pressure drops below this range, your boiler will display the E118 code and stop working to protect itself.

Think of it as your boiler's way of saying, "Hey, I need a drink!" During our water pressure troubleshooting, we often find that this happens naturally over time, but it could also indicate a small leak in your system that needs attention.

What Causes The E118 Fault Code?

Several pressure-related issues can trigger your Baxi boiler's E118 fault code, with system leaks being the most common culprit.

You might notice this happening after you've bled your radiators or if your system's been drained for boiler maintenance without proper repressurising.

Over time, you'll find that even the smallest leaks in your radiators or pipework can cause the pressure to drop below that vital 0.5 bar mark.

That's why regular pressure monitoring is so important – it's like keeping an eye on your car's oil level!

A faulty pressure valve could also be the troublemaker here.

And sometimes, it's just those sneaky microscopic leaks that gradually reduce your system's pressure over time.

Don't worry though – most of these issues are pretty straightforward to fix.

How Do You Fix The E118 Error Code On A Baxi Boiler?

Fixing your Baxi boiler's E118 error code starts with checking the pressure gauge. If it's reading below 1 bar, you'll need to pressurise your system to get things running smoothly again.

Don't worry – it's a common issue that we help homeowners with regularly during boiler maintenance visits.

Here's what you'll need to do:

1. Locate your filling loop (it's either under your boiler or attached externally with two black levers)
2. Open the valves carefully to allow water pressure to build up to between 1 and 1.5 bars
3. Reset your boiler once the pressure's right and you're good to go

Get Your Baxi Boiler E118 Problem Repaired By A Professional

Don't let a persistent E118 fault disrupt your home's heating and hot water.

Book a Gas Safe registered engineer today for expert diagnosis and repair of your Baxi boiler. Our qualified professionals will thoroughly inspect your system, identify the root cause, and implement a lasting solution.

Schedule your appointment now through our secure online booking system at booking.thamesboilers.co.uk or call us to arrange a convenient time for your repair.