What does the Ideal F2 or Fn or Ln fault code mean?

Your boiler is failing to stay lit, which means it has safely shut itself down because it cannot consistently produce or hold a flame.

How much does it cost to fix Ideal error code F2 or Fn or Ln?

Typical repair cost for the Ideal F2 or Fn or Ln fault is £150-350 including labour.

Manufacturer manual

Flame Loss

From this model's manual

Verified against the Ideal Logic Combi Esp1 installation & service manual, page 55.

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Boiler cover options

A cover plan would handle faults like F2 or Fn or Ln: no call-out fees, no surprise bills.

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Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.

Safety-critical — turn off, read this.