What does the Ideal H9/L9 fault code mean?

Your boiler has shut down because the internal gases have become too hot, causing the system to lock out for safety until it cools down.

How much does it cost to fix Ideal error code H9/L9?

Typical repair cost for the Ideal H9/L9 fault is £120-£350 including labour.

FLUE GAS OVERHEAT (displays 3 horizontal lines until temperature drops below 50oC)

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.

Safety-critical — turn off, read this.