Navien NR-20DU Manual Del Usuario página 65

Error Code
E441 Hot water inlet2: thermistor open
or short.
E515 Abnormal operation: controller
E517 Abnormal operation: DIP switch
setting
E593 Abnormal operation: front panel
key
E615 Abnormal operation: input and
memory
E736 Abnormal operation: cascade
communication
E760 Flushing/service alarm
E782 Abnormal operation: main panel
communication
If any of these remedies do not resolve the problem, contact Technical Support at 0844-332-2323
Note
Reason Self-diagnostic / Action
Contact Technical Support at 0844-332-2323
Check the front panel settings.
Check the settings for Circuit Board DIP Switch (See the
Installation manual).
Contact Technical Support at 0844-332-2323
Contact Technical Support at 0844-332-2323
Contact Technical Support at 0844-332-2323
Contact the installer to perform routine service.
Contact Technical Support at 0844-332-2323