Section F High

Alpha Section F Fault Code

Also written as SECTIONF — same fault.

The Alpha Section F fault code means: your boiler is failing to light the burner, meaning it cannot produce heat or hot water because of a potential electrical or sensor issue.. It appears on 1 Alpha 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: 240 V at gas valve and across PCB terminals 5, 6; or Gas at burner; or DHW/Primary temp. sensor faulty; or Ignition PCB problem
Typical repair cost £150-350 (including labour)

Engineer required

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

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Alpha models that show the Section F fault code

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

Source

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

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