What does the Ideal FU fault code mean?

Your boiler has detected that water is getting too hot too quickly, which usually means the water isn't flowing through the system properly.

How much does it cost to fix Ideal error code FU?

Typical repair cost for the Ideal FU fault is £100-£250 including labour.

Check that the flow and return isolation valves underneath the boiler are fully open

Difference greater than 50c – check isolation valves are open

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.

7 signs repair isn't worth it anymore.