Mains LED flashing High

Baxi Mains LED flashing Fault Code

Also written as MAINSLEDFLASHING — same fault.

The Baxi Mains LED flashing fault code means: your boiler is failing to communicate with its control panel, which means it cannot receive instructions to switch on for heating or hot water.. It appears on 2 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Control knob is not on, or fault in wiring between control PCB and interface PCB / faulty control PCB.
Typical repair cost £150-300 (including labour)

Engineer required

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

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Baxi models that show the Mains LED flashing fault code

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

Source

Baxi Mains LED flashing 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 7 July 2026