What does the Baxi E109 fault code mean?

Your boiler is overheating because the water isn't moving around the system properly, causing the safety sensors to shut the unit down.

How much does it cost to fix Baxi error code E109?

Typical repair cost for the Baxi E109 fault is £180-350 including labour.

Check that your boiler pressure is between 1 and 1.5 bar on the gauge.

Poor circulation

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.

Lockout fault with a reset-needed pattern.