What does the Baxi H.01 – .08 fault code mean?

Your boiler is overheating or water isn't moving through the system fast enough, causing it to shut down for safety.

How much does it cost to fix Baxi error code H.01 – .08?

Typical repair cost for the Baxi H.01 – .08 fault is £120-£350 including labour.

Ensure all radiator valves (TRVs) are turned to the highest setting

Sensor fault, flow temperature increasing too fast in heating mode 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.