398 055 High

Ideal 398 055 Fault Code

Also written as 398055 — same fault.

The Ideal 398 055 fault code means: your boiler's main burner is not receiving the correct flow of gas needed to ignite and stay lit, meaning your heating system will not work.. It appears on 2 Ideal models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Main burner injector (RS 4100)
Typical repair cost £140-£280 (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 398 055 fault code

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

Source

Ideal 398 055 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 7 July 2026