How much does it cost to fix Alpha error code 13?

Typical repair cost for the Alpha 13 fault is £120-220 including labour.

13 High

Alpha 13 Fault Code

Q: What does the Alpha 13 fault code mean?

Your boiler is failing to detect that you have turned on a hot water tap, so it is refusing to heat the water for you.

The Alpha 13 fault code means: your boiler is failing to detect that you have turned on a hot water tap, so it is refusing to heat the water for you.. It appears on 1 Alpha model in our database.

Technical description: DHW flow valve microswitch

Typical repair cost £120-220 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Alpha models that show the 13 fault code

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

240XE Repair: £120-220

Source

Alpha 13 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