What does the Alpha 0A18 fault code mean?

Your boiler has detected an unexpected, rapid temperature change, causing it to shut down for safety while it monitors the water flow.

How much does it cost to fix Alpha error code 0A18?

Typical repair cost for the Alpha 0A18 fault is £90-180 including labour.

Check that all radiator valves are fully open

Flow and return sensor anomaly detected. Sudden temperature change detected on the flow or return sensor.

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.

Sludge build-up — needs flushing, not bleeding.

7 signs repair isn't worth it anymore.