What does the Alpha Neon B fault code mean?

Your boiler has automatically shut down because it detected that it was getting too hot, likely to prevent internal damage.

How much does it cost to fix Alpha error code Neon B?

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

Flashing on and off - Overheat thermostat has operated. Rotate selector switch to the reset position (3) to reset.

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

Almost always a stuck diverter valve on combis.

Each noise points to a different fault.

Work through these before the call-out.