95 High

Navien 95 Fault Code

The Navien 95 fault code means: your boiler's computer system has detected a minor internal processing error that is preventing it from operating correctly.. It appears on 1 Navien model 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: Time of day invalid
Typical repair cost £150-300 (including labour)

DIY fix possible

Switch the boiler off at the fused spur or mains power for 60 secondsTurn the power back onUse the control panel to reset the current time and date according to your user manual

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Navien models that show the 95 fault code

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

Source

Navien 95 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