Code index · 6 entries
Navien tankless water heater error codes
What does your Navien tankless water heater error code mean? 6 codes from official Navien tankless water heater documentation. Select a code for causes, how to fix it safely and when to call a pro. Navien manufacturer manual (PDF) (opens in a new tab) ↗.
6 of these 6 Navien tankless water heater pages are marked call-a-pro because the source document points at gas, venting, refrigerant, high voltage or a control the manual does not leave to a homeowner. The other 0 start with a check the document describes, then say when to stop.
Ignition failure: the burner did not light.
False flame detection: the control sensed a flame when it should not have.
Flame loss: the burner lit and then lost its flame.
Overheating of the heat exchanger.
Exhaust overheating: the heater shuts down when flue temperature exceeds 149°F (65°C).
Abnormal air pressure.
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Source: Navien manufacturer manual (PDF) (opens in a new tab) ↗ · Last updated