BoilerFaultCodesNavien 268 Fault Code
The Navien 268 fault code means: your boiler is having trouble controlling the gas flow needed to heat your water, which means the unit has shut down as a safety precaution.. It appears on 1 Navien model in our database.
Technical description: Spool valve fault: Spool valve fault: feedback signal of spool valve did not reach tolerance band of ± 5% of rated value within detection time (typ. 60 sec.)
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 268 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Navien 268 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 7 July 2026