How much does it cost to fix Ideal error code F9, L9, F8 or L8?

Typical repair cost for the Ideal F9, L9, F8 or L8 fault is £280-550 including labour.

F9, L9, F8 or L8 High

Ideal F9, L9, F8 or L8 Fault Code

Q: What does the Ideal F9, L9, F8 or L8 fault code mean?

Your boiler's internal computer has either lost its settings or suffered an electrical failure, meaning the system cannot communicate with itself to start up.

Also written as F9L9F8ORL8 — same fault.

The Ideal F9, L9, F8 or L8 fault code means: your boiler's internal computer has either lost its settings or suffered an electrical failure, meaning the system cannot communicate with itself to start up.. It appears on 7 Ideal models in our database.

Technical description: Printed circuit board (PCB) unconfigured or fault

Typical repair cost £280-550 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ideal models that show the F9, L9, F8 or L8 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ideal F9, L9, F8 or L8 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026