What does the Alpha 23 fault code mean?

Your boiler's computer is confused because it has detected a mismatch between its internal settings and how the plumbing system is actually set up.

How much does it cost to fix Alpha error code 23?

Typical repair cost for the Alpha 23 fault is £120-250 including labour.

Incorrect configuration - 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.