What does the Ideal Overheat lockout fault code mean?

Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.

How much does it cost to fix Ideal error code Overheat lockout?

Typical repair cost for the Ideal Overheat lockout fault is £100-£350 including labour.

Check that your radiator valves and boiler valves are fully open

Bleed radiators, refill system to 1.0 bar, check that radiator and boiler valves are open and reset boiler. If fault continues call an Engineer

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.

Work through these before the call-out.