What does the Alpha 19 fault code mean?

Your boiler has automatically turned itself off because it has detected that its internal water temperature has become too hot for safe operation.

How much does it cost to fix Alpha error code 19?

Typical repair cost for the Alpha 19 fault is £120-250 including labour.

Overheat thermostat

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

Each noise points to a different fault.

Almost always a stuck diverter valve on combis.

Work through these before the call-out.