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

A temperature limit inside the appliance was exceeded and it shut down to protect itself.

Brand Code Meaning What you can do
Rinnai 14 Overheat safety device tripped Call a pro
Rinnai 57 Burner overheat switch open Call a pro
Navien E016 Heat exchanger overheated Safe checks first, then a pro
Navien E031 Burner overheated Call a pro
Navien E046 Limit control fault Call a pro