How much does it cost to fix Ideal error code Fault led (B) illuminated?

Typical repair cost for the Ideal Fault led (B) illuminated fault is £150-300 including labour.

Fault led (B) illuminated High

Ideal Fault led (B) illuminated Fault Code

Q: What does the Ideal Fault led (B) illuminated fault code mean?

Your boiler is failing to ignite the flame it needs to heat your water or radiators due to a persistent ignition issue.

Also written as FAULTLEDBILLUMINATED — same fault.

The Ideal Fault led (B) illuminated fault code means: your boiler is failing to ignite the flame it needs to heat your water or radiators due to a persistent ignition issue.. It appears on 1 Ideal model in our database.

Technical description: Boiler fails to light after 10 seconds

Typical repair cost £150-300 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ideal models that show the Fault led (B) illuminated fault code

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

Boxer Repair: £150-300

Source

Ideal Fault led (B) illuminated 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