How to Fix Baxi 105 HE & 105e Fault Codes

A Baxi 105 HE fault code usually points you towards the cause of the problem. Some faults have simple checks you can carry out yourself, while others need a Gas Safe registered engineer.

This guide explains the most common Baxi 105 HE and 105e fault codes, what they mean and when professional repair is the safest option.

What Is a Baxi 105 HE Boiler?

The Baxi 105 HE is a popular combi boiler found in many London homes. It provides heating and hot water from a single appliance and includes a diagnostic system that displays fault codes when a problem is detected.

What Do Baxi 105 HE Fault Codes Mean?

Fault codes appear when the boiler detects an issue. Some are shown as E-codes, while others appear as flashing lights. Each code points to a different fault, helping narrow down the cause before repairs begin.

If your boiler is displaying a different error, see our complete guide to Baxi boiler fault codes for explanations of other models and error codes.

Common Causes of Baxi 105 HE Fault Codes

Typical causes include:

• Low system pressure
• Ignition failure
• Poor water circulation
• Pump faults
• Fan or flue problems
• Boiler overheating
• Frozen condensate pipes during cold weather

How to Troubleshoot Common Baxi 105 HE Fault Codes

E133 (3 Red Flashes) – Ignition Failure

Meaning: the boiler has failed to ignite.

Check:

• Confirm your gas supply is working.
• Check another gas appliance.
• Reset the boiler once.

If E133 returns after resetting, the problem may involve the ignition components or gas valve and should be inspected by a Gas Safe engineer.

E119 – Low Water Pressure

Meaning: system pressure has fallen below the operating level.

Check: repressurise the boiler using the filling loop until the pressure reaches around 1.5 bar.

If pressure keeps dropping, there is likely to be a leak that requires repair.

E125 – Circulation Fault

Meaning: water is not circulating correctly.

Check: try a boiler reset.

If the fault remains, the pump, airlocks or internal components should be inspected by an engineer.

E160 – Fan Fault

Meaning: the boiler fan or related wiring has developed a fault.

Check: this is not a DIY repair. Turn the boiler off and arrange a professional inspection.

E28 – Frozen Condensate Pipe

Meaning: the condensate pipe has frozen, preventing normal operation.

Check: carefully thaw the pipe using warm, not boiling, water before resetting the boiler.

When to Call a Gas Safe Engineer

Arrange a repair if:

• The same fault code returns after resetting.
• You are unsure how to carry out a check safely.
• You suspect a gas leak.
• The fault involves the fan, pump, gas valve or other internal components.

Annual servicing also helps identify worn parts before they cause a breakdown. If these checks don't clear the fault, book a Baxi boiler repair in London and one of our Gas Safe engineers can diagnose the problem safely.

Preventing Future Boiler Faults

Regular servicing and simple upkeep reduce the chance of these faults developing. Keep system pressure topped up, bleed radiators when needed, and book an annual Gas Safe service.

Frequently Asked Questions - (FAQs)

Most models have a reset button or reset position on the control dial. Follow the manufacturer's instructions.

Repeated pressure loss usually indicates a leak within the heating system or boiler.

A yearly Gas Safe service helps keep the boiler safe, reliable and efficient.

Need Help with a Baxi 105 HE Fault?

If your boiler still shows the same fault code after the recommended checks, book a Gas Safe engineer.

Serviceteam provides Baxi boiler repairs across London with clear pricing and experienced engineers.