Eco Happy (Solar Expert)

Published February 8, 2024

Imagine being able to diagnose and fix common Baxi boiler issues with just a little bit of knowledge and guidance, which is what this expert guide is for.

Here you can learn about the most common Baxi boiler error codes, what they mean, and when to call in a professional engineer.

Baxi Boiler Fault Codes – Summary

  • This article provides an in-depth analysis of Baxi boiler fault codes and outlines solutions for sensor errors, gas/air supply issues, and high-temperature warnings.
  • To fix the error codes, homeowners may need to repressurise or reset their boilers. If these steps do not work, a qualified engineer should be contacted.
  • For all Baxi Boiler faults, it is recommended to call an experienced Gas Safe registered engineer for safe repair.

Baxi Boiler Error Codes

Seeing a fault code on your Baxi boiler and realising it isn’t working as it should sounds like a real nightmare, but there’s no need to worry, as there are many easy fixes to many of the error codes.

Baxi boiler error codes are displayed on the LCD screen to help identify issues, including those related to the printed circuit board (PCB). These codes can range from simple pressure-related problems to more complex sensor faults, which affect the boiler’s efficiency and performance.

In this section, we will go through some of the most common Baxi boiler error codes and how to fix them.

But first, it’s essential to know that you should always consult the boiler manual or search online for more information about any error code you encounter.

Remember that Baxi boiler lockouts are designed to protect you and your boiler from potential harm caused by a defective gas air unit. With that in mind, let’s dive into the specifics of these common error codes.

Fixing the E1 Error Code

The E1 error code signifies a low pressure or water leak issue in the Baxi boiler, which may lead to a critical flow temperature reached error code. Potential low-pressure or water leak issues indicated by the E1 error code can affect the maximum flue gas temperature in the Baxi boiler.

The second two digits in the E1 error code offer further insight into the issue, such as critical flow temperature.

To rectify this issue, the boiler must be repressurised, which may involve a temporary error self-reset. Observe the display for the entire error code, as it may provide information on the maximum safe temperature value for your Baxi boiler.

If repressurising your boiler doesn’t resolve the issue, it may be necessary to seek professional assistance to identify the cause of the problem, which could include poor system circulation, damaged components, or sensor faults.

Fixing the E119 Fault Code

The E119 fault code signifies that the water pressure is below the required 0.5 bar, which can affect the maximum flow temperature value. A Baxi boiler requires a water pressure of 0.5 bar, and any issues with the fan wiring fault can lead to pressure-related error codes.

Fortunately, the E119 fault code can be remedied by the homeowner by replenishing the system water pressure in the boiler. If you’re unsure about how to do this, consult your boiler manual or seek guidance from a professional.

Fixing the E168 Error Code

The Baxi boiler E168 fault code indicates that the boiler has identified an issue, such as a false flame signal, but the precise cause cannot be ascertained.

Typical causes of the E168 error code on a Baxi boiler may include a defective PCB (main control board), an obstructed condensate pipe, or a firmware/software issue, which can lead to low system water pressure.

The first step to take when addressing the E168 error code is resetting the boiler. If this doesn’t resolve the issue, then it’s recommended to contact a qualified engineer who can provide further assistance with the repair, especially if nothing seems to be fixing the problem.

Fixing the E133 Error Code

The E133 error code can indicate various issues, such as gas supply, ignition failure, or a frozen condensate pipe. To ensure that the gas supply to the boiler is not disrupted, it is important to check if other gas appliances in the home are functioning properly and if the flow sensor is working correctly.

Inspecting the ignition is another important step. Ensure that the ignition probes are free from any debris, and if they are dirty, clean them carefully.

It’s also necessary to ensure that the flame rectification probe is clean and correctly positioned. If the probe is dirty or misaligned, it should be cleaned or adjusted accordingly.

If the steps outlined above do not resolve the issue, it’s recommended that a qualified heating engineer or Baxi service technician be contacted to receive further assistance.

Fixing the E125 Fault code

The E125 fault code indicates a circulation problem, which may be due to a pump malfunction or blockage. Low system pressure can be a contributing factor to the E125 fault code in a Baxi boiler, as it may lead to a circulation fault. To address this issue, topping up the boiler pressure is recommended.

If the issue persists, you are advised to contact a gas-safe engineer for further assistance. They can examine the primary circulation system for any blockages or obstructions that may be hindering the water from circulating adequately and also assess the pump for any potential malfunctions.

Advanced Error Code Analysis

Beyond the commonly seen error codes, Baxi boilers may also exhibit a range of different fault codes that aren’t as common. Now, we will go through some of these codes and will cover sensor errors, challenges with gas and air supply, and high-temperature warnings, along with their respective solutions.

Sensor Errors and Their Fixes

Common sensor errors experienced with Baxi boilers are sensor error, sensor fault, and temperature fault. These errors can be rectified by replacing the faulty sensor or temperature sensor. Temperature sensors in Baxi boilers measure the temperature of the water or air in the boiler, which is then utilised by the boiler’s control system to adjust the burner and guarantee that the desired temperature is retained.

Pressure sensors in Baxi boilers are used to monitor and regulate the pressure levels within the boiler system, thus preventing any potential damage or malfunction. Error codes E119 and E125 are indicative of a pressure sensor issue in Baxi boilers.

On encountering any sensor not or badly functioning error codes, referring to your boiler manual or seeking professional guidance to decide the right course of action is advisable.

Gas and Air Supply Glitches

Gas and air supply glitches in Baxi boilers may be due to faulty ignition systems, gas supply issues, blocked burner jets, and air in the system.

To address these issues, it’s recommended to check the boiler’s pressure, bleed the radiators, inspect the gas supply, verify the ignition system, clean or unblock the burner jets, and contact a Gas Safe registered engineer if the problem persists.

Gas valve faults and fan failures are frequent gas and air supply issues encountered with Baxi boilers. These issues can manifest as a boiler failing to ignite, peculiar noises from the gas valve, or a noisy boiler. Addressing gas valve faults requires checking the boiler’s pressure, thermostat settings, radiator valves, heat exchangers, and water flow.

If these solutions do not resolve the issue, contacting a certified heating engineer is advised.

High-Temperature Warnings

High-temperature warnings in Baxi boilers may be due to a malfunctioning boiler thermostat or PCB that is not able to switch off the gas valve.

One flash of the green light in Baxi boilers is indicative of a high-temperature warning, which may be caused by exceeding the maximum flow temperature, a high flow temperature rise rate, or an excessive difference between the flow and return temperature.

Monitoring the critical flue gas temperature can help in identifying and addressing these issues, including flow temperature increasing scenarios.

Examining the following components are the usual solutions for high-temperature warnings in Baxi boilers:

  • Boiler pressure
  • Thermostat settings
  • Radiator valves
  • Heat exchanger
  • Water flow

If these solutions do not resolve the issue, it is advisable to contact a certified heating engineer, as the problem may be due to non-existent or insufficient components.

All Baxi Error Codes

Now that we’ve covered some common and advanced Baxi boiler error codes, it’s important to remember that there are many other error codes that may be displayed on your boiler’s LCD screen. These error codes indicate specific faults or issues with the boiler.

Here is a list of all Baxi boiler error codes, along with what they mean, making sure you know what the issue is and what you can do to fix it whenever this fault code is displayed:

Baxi Boiler Fault Code – Calling an Engineer

Recognising Baxi boiler error codes and possible DIY remedies is important. However, there are instances where a professional engineer’s intervention is warranted.

For safety and effective issue resolution, all repairs should be executed by a Gas Safe registered engineer.

To ensure the highest quality service from a professional engineer for Baxi Boiler faults, select a Gas Safe registered engineer with research experience and expertise, verify manufacturer-approved engineers, request recommendations, and compare quotes.

Attempting to rectify Baxi Boiler fault codes without professional help may result in further damage to the boiler, potential safety hazards, and voiding the warranty.

Baxi Boiler Error Codes – Our Verdict

In conclusion, understanding Baxi boiler error codes and knowing when to call a professional engineer is essential in maintaining your boiler’s efficiency and your own safety.

Equipped with the knowledge from this guide, you’ll be better prepared to identify common and advanced error codes, troubleshoot issues, and make informed decisions about when to seek professional help.


What does the E1 error code mean on a Baxi boiler?

The E1 error code on a Baxi boiler indicates a low-pressure or water leak issue requiring immediate attention.

How can I fix the E119 fault code on my Baxi boiler?

Replenish the system water pressure in your Baxi boiler to fix the E119 fault code.

What should I do if my Baxi boiler displays the E168 error code?

If the E168 error code is displayed on your Baxi boiler, you should try resetting it first and contact a qualified engineer for further assistance.

When should I call a professional engineer for help with Baxi boiler fault codes?

If you’re uncertain of the issue or unable to fix it yourself, it’s best to contact a professional engineer for assistance with Baxi boiler fault codes.

What are some common sensor errors in Baxi boilers?

Common sensor errors in Baxi boilers include sensor error, sensor fault, and temperature fault.

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