How much does it cost to fix Alpha error code STOP?

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

STOP High

Alpha STOP Fault Code

Q: What does the Alpha STOP fault code mean?

Your boiler has blocked itself from restarting due to too many failed attempts and needs to remain off for an hour before it will let you try again.

The Alpha STOP fault code means: your boiler has blocked itself from restarting due to too many failed attempts and needs to remain off for an hour before it will let you try again.. It appears on 4 Alpha models in our database.

Technical description: Reset attempts finished. Wait for 1 hour to re-acquire 1 attempt.

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 STOP fault code

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

C25 Xtraflame Repair: £120-250
H25 Xtraflame Repair: £120-250
Intec 28GS Repair: £120-250
Intec 50CS Repair: £120-250

Source

Alpha STOP 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