How much does it cost to fix Navien error code Ignition failure?

Typical repair cost for the Navien Ignition failure fault is £150-300 including labour.

Ignition failure High

Navien Ignition failure Fault Code

Q: What does the Navien Ignition failure fault code mean?

Your boiler is trying to start but cannot light the flame, which means it has safely shut itself down to prevent a gas buildup.

Also written as IGNITIONFAILURE — same fault.

The Navien Ignition failure fault code means: your boiler is trying to start but cannot light the flame, which means it has safely shut itself down to prevent a gas buildup.. It appears on 6 Navien models in our database.

Technical description: Gas supply fault, Electrode gap and shape faults, No spark from the electrode, Ignition transformer, or Main gas valve failure.

Typical repair cost £150-300 (including labour)

Engineer required

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

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Navien models that show the Ignition failure fault code

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

Source

Navien Ignition failure fault code information on this page is sourced and cross-checked against the official Navien service / installation manuals for each affected model.

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