Lights: Flash, Off, Flash High

Baxi Lights: Flash, Off, Flash Fault Code

Also written as LIGHTSFLASHOFFFLASH — same fault.

The Baxi Lights: Flash, Off, Flash fault code means: your boiler is not receiving enough electrical power to operate properly, likely due to a fault in your home's wiring or a power supply issue.. 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: Low Electrical Supply. Incoming Voltage less than 180V. Check System Controls & System Wiring.
Typical repair cost £90-250 (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 Lights: Flash, Off, Flash fault code

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

Source

Baxi Lights: Flash, Off, Flash 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