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

Your boiler is overheating because water isn't moving through the system quickly enough or a sensor is giving a false reading.

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.

Lockout fault with a reset-needed pattern.

Sludge build-up — needs flushing, not bleeding.