How to Fix Baxi 105 HE Fault Codes?

What is a Baxi 105 HE Boiler?

The Baxi 105 HE is a popular combination (combi) boiler known for its reliability and efficiency. Found in many homes across London, it provides both central heating and instant hot water from a single, compact unit. Like all modern boilers, it features a built-in diagnostic system that uses fault codes to indicate when something is wrong, helping to identify problems quickly and prevent further damage.

Always seek help from a qualified boiler repair professional near you to ensure the job is handled safely and correctly.

What are Baxi 105 HE Fault Codes?

Baxi 105 HE fault codes are error messages that appear on your boiler's display panel when it detects a problem. These codes can be represented by a combination of letters and numbers (like E133) or a sequence of flashing lights. Each code indicates a specific issue, ranging from simple fixes, such as low water pressure, to more complex internal faults that require an expert.

What Causes Baxi 105 HE Fault Codes?

Fault codes on your Baxi 105 HE can be triggered by various issues. Some of the most common causes include:

• Low System Pressure: The water pressure in the central heating system is too low for the boiler to operate safely.
• Ignition Failure: The boiler is unable to ignite, often due to a disruption in the gas supply.
• Poor Water Circulation: A blockage, airlock, or faulty pump is preventing water from circulating correctly through the system.
• Fan or Flue Problems: The fan that expels waste gases is malfunctioning, or there's an issue with the flue system.
• Boiler Overheating: The boiler is getting too hot, causing a safety thermostat to shut it down.
• Frozen Condensate Pipe: In cold weather, the pipe that drains condensation can freeze, causing a blockage.

How to Troubleshoot Baxi 105 HE Fault Codes

When a fault code appears, some initial checks can help you diagnose and even solve the problem without needing to call an engineer.

Here's a breakdown of the most common Baxi 105 HE fault codes and how you can address them.

E133 (or 3 Red Flashes) – Ignition Failure

This is one of the most frequent faults, indicating that your Baxi combi 105 HE is not firing up.

What it means: The boiler has attempted to ignite but failed. This is often due to a lack of gas.

What to do:

1. Check your gas supply: Ensure your home's gas supply is turned on. Check if other gas appliances, like your hob, are working. If not, the issue may be with your gas supply, and you should contact your provider.
2. Reset the boiler: If the gas supply is fine, try resetting the boiler. This can clear a temporary glitch. Most Baxi models have a clearly marked reset button or dial.

If the Baxi boiler E133 code persists after a reset, there could be a more serious issue with an internal component, such as the gas valve or ignition probes. In this case, you should call a professional.

E119 – Low Water Pressure

What it means: The water pressure in your heating system has dropped below the required level for safe operation (typically below 1 bar).

What to do: When you see Baxi boiler E119, you will need to repressurise the system using the filling loop, a flexible, braided hose usually located underneath the boiler.

1. Attach the filling loop securely at both ends.
2. Gently open the valves to let water flow back into the system.
3. Watch the pressure gauge and close the valves once it reaches 1.5 bar.
4. Remove the filling loop.

If you frequently need to repressurise the system, you may have a leak. This requires professional attention.

E125 – Circulation Fault

What it means: The water is not circulating correctly through the primary heating circuit. This could be due to a faulty pump or an airlock in the system.

What to do: A boiler reset might clear a temporary pump issue. However, if the E125 Baxi fault persists, it indicates a problem that needs an engineer's expertise, such as bleeding the pump or replacing it.

E160 – Fan Fault

What it means: There is a problem with the boiler's fan or its wiring. The fan is a critical safety component that removes harmful flue gases.

What to do: This is not a user-fixable issue. For your safety, turn off the boiler and contact a Gas Safe registered engineer immediately.

E28 – Frozen Condensate Pipe

What it means: The Baxi E28 fault code commonly occurs during winter when the external condensate pipe freezes, causing a blockage.

What to do: You can often resolve this yourself by carefully thawing the pipe. Pour warm (not boiling) water over the exposed section of the pipe until the ice melts. Once cleared, reset the boiler.

When to Call an Engineer?

While some troubleshooting is safe for homeowners, many Baxi 105 fault codes indicate internal problems that require professional expertise.

You should always call a gas heating registered engineer if:

• A fault code persists after a reset.
• You are unsure how to perform a troubleshooting step.
• You suspect a gas leak (smell gas, turn off the supply, and call for emergency help).
• The fault code relates to internal components like the fan (E160), pump (E125), or gas valve.

Boiler Maintenance London

Regular maintenance is the best way to prevent fault codes from appearing in the first place. An annual boiler service ensures all components are clean, safe, and working efficiently. This helps extend your boiler's lifespan while keeping it operating efficiently, reducing energy costs and avoiding unexpected repair expenses.

For landlords in London, an annual Gas Safety check is a legal requirement, and a boiler service is a key part of fulfilling that obligation.

Serviceteam Boiler Repair Professionals

If you're facing persistent Baxi 105e fault codes or need a reliable engineer for a service, Serviceteam is here to help. Our team of gas heating engineers has extensive experience with all Baxi models, including the 105 HE. We offer:

• Fast, reliable boiler repairs across London.
• Annual boiler servicing to keep your heating system in top condition.
• Transparent pricing with no hidden costs.
• Certified and experienced engineers you can trust.

Don't let a boiler fault leave you in the cold. Contact Serviceteam today for expert assistance.

Frequently Asked Questions (FAQs)

Most Baxi 105 HE models have a reset button or a dial that can be turned to the 'R' position and held for a few seconds. Check your user manual for the exact procedure for your model.

The pressure gauge is typically located on the front panel of the boiler. It's a circular dial, often with green and red zones to indicate safe and unsafe pressure levels.

Frequent pressure loss almost always indicates a leak somewhere in your central heating system; it could be in the pipework, radiators, or within the boiler itself. A Gas Safe engineer should be called to locate and fix the source of the leak.

It's recommended to get your boiler serviced annually by a qualified Gas Safe registered engineer. This ensures it operates safely and efficiently and can prevent many common faults.