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

A setting, dip switch or installation parameter is wrong for the connected equipment.

Brand Code Meaning What you can do
Rinnai 21 Data transfer or dip switch error Call a pro
Navien E517 DIP switch setting error Call a pro
Navien E773 Wrong gas type detected or gas connection fault (depends on model) Call a pro
Navien E788 Gas type setting mismatch Call a pro