What does the Alpha 15 fault code mean?

Your boiler's computer is confused because its internal settings do not match how the system is physically connected or configured.

How much does it cost to fix Alpha error code 15?

Typical repair cost for the Alpha 15 fault is £120-250 including labour.

Incorrect hydraulic configuration. There is an inconsistency between the settings and signals received from the PCB

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Work through these before the call-out.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.