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Ignition failure: tankless water heater / continuous flow hot water system codes by brand

The appliance tried to light the burner and did not detect a flame.

Brand Code Meaning What you can do
Rinnai 02 Burner did not light during freeze protection Safe checks first, then a pro
Rinnai 11 No ignition Safe checks first, then a pro
Navien E003 Ignition failure Safe checks first, then a pro