What does the Baxi 166 fault code mean?

Your boiler has detected an issue with how it clears exhaust gases, preventing it from firing up safely to provide heating and hot water.

How much does it cost to fix Baxi error code 166?

Typical repair cost for the Baxi 166 fault is £120-220 including labour.

Air pressure switch fault

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.

Six most common causes of dropping pressure.

Each noise points to a different fault.