How much does it cost to fix Alpha error code Section L?

Typical repair cost for the Alpha Section L fault is £120-250 including labour.

Section L High

Alpha Section L Fault Code

Q: What does the Alpha Section L fault code mean?

Your boiler is not receiving a signal to turn on, which is likely due to the timer settings or the thermostat connections not communicating correctly.

Also written as SECTIONL — same fault.

The Alpha Section L fault code means: your boiler is not receiving a signal to turn on, which is likely due to the timer settings or the thermostat connections not communicating correctly.. It appears on 1 Alpha model in our database.

Technical description: Internal clock / external controls not calling for heat, or clock/wiring/PCB fault

Typical repair cost £120-250 (including labour)

DIY fix possible

Check your external wall thermostat or programmer is set to 'On' and the temperature is turned up higher than the current room temperatureEnsure your boiler's internal clock is set to the correct time and is currently within an 'On' periodReplace the batteries in your wireless room thermostat if applicable

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Alpha models that show the Section L fault code

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

240XE Repair: £120-250

Source

Alpha Section L 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