What does the Alpha 51 fault code mean?

Your boiler is struggling to talk to the wireless thermostat controller, meaning it doesn't know when to turn your heating on or off.

How much does it cost to fix Alpha error code 51?

Typical repair cost for the Alpha 51 fault is £120-250 including labour.

Check that your Climatic thermostat has fresh, high-quality batteries.

Climatic RF communication fault. Error between communication of the Climatic transmitter and boiler receiver

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.