Baxi Boiler Fault Codes Explained

It always seems to come at the worst possible time, you have family staying or Winter is approaching, then your Baxi boiler decides to throw a fault code and you’re left scratching your head wondering if you need to find an emergency boiler engineer. This guide has been designed to hopefully provide some reassurance and context to the error code you are experiencing.

If your Baxi boiler develops a fault, it will usually go into a safety lockout to prevent damage and protect your home. When this happens, an error code will appear on the boiler’s display.

These fault codes are there to help identify what’s gone wrong. Understanding them can give you a clearer idea of the issue before contacting a Gas Safe registered heating engineer.

It’s important that you don’t attempt to repair or open your boiler yourself, as this can be dangerous and may invalidate your warranty.

At Just Gas, we specialise in diagnosing and repairing Baxi boilers quickly and safely across Torquay and the surrounding areas.

What Are Baxi Boiler Fault Codes?

Baxi boilers use a range of fault codes, typically made up of numbers or a combination of letters and numbers, such as E119 or it may take the form of H.02.07, to indicate when something isn’t working correctly.

These codes help engineers quickly diagnose faults, saving time and helping to get your heating system back up and running as efficiently as possible. If you can provide the fault code when you contact us, we’ll have a better idea of the issue before attending.

Common Baxi Boiler Fault Codes

Here are some of the most commonly seen Baxi boiler fault codes and what they usually mean:

E119/H.02.07 Fault Code – Low Water Pressure

Cause: System pressure is too low

What to check: Boiler pressure gauge (should typically be around 1–1.5 bar)

Solution: Repressurise the system using the filling loop.

E133/E0410 Fault Code – Ignition / Gas Supply Fault

Cause: The boiler has failed to ignite, often due to a gas supply issue.

What to check:

Gas supply is turned on
Prepayment meter has credit

Solution: Reset the boiler. If the issue persists, contact an engineer.

E110/ H.01.14 Fault Code – Overheating

Cause: The boiler has overheated

What to check:

Radiators are open
System has proper circulation

Solution: Allow the boiler to cool and reset. If it continues, call an engineer.

E168/ H.03.54 Fault Code – Internal / PCB Fault

Cause: General internal fault, often linked to the PCB.

Solution: Requires professional diagnosis and repair.

E28/ E40 Fault Code – Flue or Air Pressure Issue

Cause: Problem with airflow or flue system

Solution: Must be inspected by a Gas Safe registered engineer.

Should you not see the fault code appearing on your Baxi boiler in this list, you can try the Baxi website for more information on your specific boiler model.

Should You Fix a Boiler Fault Yourself?

Most Baxi boiler fault codes relate to internal components or gas-related systems and should only be handled by a qualified professional.

While you may be able to resolve simple issues, such as low pressure, attempting more complex repairs yourself can be unsafe and may void your warranty.

When to Call a Heating Engineer for your Baxi Boiler

You should contact a professional if:

The fault code keeps returning
Your boiler won’t reset
You have no heating or hot water
You notice unusual noises or smells
You suspect a gas-related issue

Our experienced engineers at Just Gas are fully qualified to diagnose and repair all Baxi boiler faults safely and efficiently.

Baxi Boiler Repairs in Torquay

We offer:

Whether it’s a minor repair or a more complex issue, we’ll get your boiler back up and running as quickly as possible.

Baxi Boiler Fault Code FAQs

If your Baxi boiler is displaying a fault code, you’ll likely have a few questions. Here are some of the most common ones:

What do Baxi boiler fault codes mean?

Baxi boiler fault codes are diagnostic messages that appear when the boiler detects a problem. Each code relates to a specific issue, helping engineers identify faults quickly.

How do I reset a Baxi boiler?

Most Baxi boilers can be reset by pressing and holding the reset button, which usually is marked with an “R” or flame icon and situated on the front panel, for a few seconds. If the fault returns, further investigation will be required.

Why does my Baxi boiler keep losing pressure?

This may be caused by leaks, recently bled radiators, or faulty components such as the expansion vessel. Ongoing pressure loss should be checked by an engineer.

Can I fix Baxi boiler faults myself?

You may be able to fix minor issues like low pressure, but most faults involve internal components or gas systems and should only be handled by a Gas Safe registered engineer.

Is it safe to use a boiler showing a fault code?

No, if your boiler is displaying a fault code, it’s best to stop using it until the issue has been diagnosed and fixed.

How much does it cost to repair a Baxi boiler?

Costs vary depending on the fault. Simple repairs are usually more affordable, while more complex issues may require replacement parts.

When should I call an engineer?

You should call an engineer if:

The fault won’t clear after resetting
Your boiler has stopped working properly
The issue keeps coming back
You have any safety concerns

Do Baxi boilers come with a warranty?

Yes, Baxi boilers typically come with manufacturer warranties, which vary depending on the model and installation.

Can regular servicing prevent boiler faults?

Yes, annual servicing helps keep your boiler running efficiently and can identify potential issues before they lead to breakdowns.

Need Help with a Baxi Boiler Fault Code?

If your boiler is showing an error code and you’re unsure what to do, we’re here to help.

Call: 01803 555577
Email: info@justgasltd.co.uk