How much does it cost to fix Baxi error code E128?

Typical repair cost for the Baxi E128 fault is £120-350 including labour.

E128 High

Baxi E128 Fault Code

Q: What does the Baxi E128 fault code mean?

Your boiler is struggling to keep its burner lit and has shut down after multiple failed attempts to maintain a flame.

The Baxi E128 fault code means: your boiler is struggling to keep its burner lit and has shut down after multiple failed attempts to maintain a flame.. It appears on 24 Baxi models in our database.

Technical description: Frequent flame failure (12 times).

What causes the Baxi E128 fault?

This fault occurs when the boiler's internal computer detects that the flame is repeatedly flickering or cutting out shortly after ignition. It is usually caused by a dirty or worn sensing probe that can no longer 'see' the flame, or a fluctuating gas supply that prevent the burner from staying lit. After twelve unsuccessful attempts to maintain a steady flame, the boiler shuts down as a safety precaution.

Typical repair cost £120-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Baxi models that show the E128 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi E128 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026