BoilerFaultCodesNavien 272 Fault Code
The Navien 272 fault code means: your boiler is not detecting enough air flow to safely release exhaust gases, so it has shut itself down to prevent a hazard.. It appears on 1 Navien model in our database.
Technical description: Diff pressure too low: Dry fire protection: Differential water pressure too low
DIY fix possible
Locate the external filling loop (a flexible metal or braided hose) connected to the underside of the boiler or nearby pipeworkSlowly open the valve(s) on the filling loop to allow water into the system until the pressure gauge reads between 1.0 and 1.5 barClose the valve(s) tightly and restart the boiler to see if the fault clears
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Navien models that show the 272 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Navien 272 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