What does the Baxi H.01 – .05 fault code mean?

Your boiler is struggling to move water around the system properly, causing it to overheat and shut down for safety.

How much does it cost to fix Baxi error code H.01 – .05?

Typical repair cost for the Baxi H.01 – .05 fault is £120-350 including labour.

Check that all radiator valves are fully open

Difference between the flow and return temperature is too high, sensor error or insufficient 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.