What does the Ideal S3 fault code mean?

Your boiler's burner has shut itself down for safety because it failed to light or stay lit correctly.

How much does it cost to fix Ideal error code S3?

Typical repair cost for the Ideal S3 fault is £120-350 including labour.

Check that your gas or oil supply is turned on and you have credit on your meter.

Burner lock indicator. Feeds signal from lockout terminal on burner control box to lock out indicator on boiler control panel.

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.

Safety-critical — turn off, read this.