LF High

Baxi LF Fault Code

The Baxi LF fault code means: your boiler is struggling to drain away the water it creates during normal operation, which is stopping it from working properly.. It appears on 1 Baxi model 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: Condensate Trap section (Blocked)
Typical repair cost £90-160 (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 LF fault code

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

Source

Baxi LF 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