What does the Alpha 0A18 fault code mean?

Your boiler has detected an unusual and rapid change in water temperature, causing it to shut down for safety reasons to prevent overheating.

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

Typical repair cost for the Alpha 0A18 fault is £150-250 including labour.

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.

Lockout fault with a reset-needed pattern.

Sludge build-up — needs flushing, not bleeding.