How much does it cost to fix Alpha error code Overheat thermostat (240XE)?

Typical repair cost for the Alpha Overheat thermostat (240XE) fault is £120-250 including labour.

Overheat thermostat (240XE) High

Alpha Overheat thermostat (240XE) Fault Code

Q: What does the Alpha Overheat thermostat (240XE) fault code mean?

Your boiler has automatically turned itself off because it became too hot, acting as a safety precaution to prevent damage.

Also written as OVERHEATTHERMOSTAT240XE — same fault.

The Alpha Overheat thermostat (240XE) fault code means: your boiler has automatically turned itself off because it became too hot, acting as a safety precaution to prevent damage.. It appears on 1 Alpha model in our database.

Technical description: The boiler will not operate and the red button on the overheat thermostat must be pressed to reset it

Typical repair cost £120-250 (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 Overheat thermostat (240XE) fault code

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

240XE Repair: £120-250

Source

Alpha Overheat thermostat (240XE) 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