Troubleshooting 75
Error Code
Sub
Code
Function Self-diagnostic/Action
E615
0
Abnormal input data from High limit switch of Heat
exchanger
●
Check the PCB.
1 Abnormal input data from exhaust sensor
●
Check the exhaust sensor wiring connection.
●
Check the exhaust sensor.
2 Abnormal input data from flame rod
●
Check the flame rod wiring connection.
●
Check the flame rod.
3~14 Abnormal memory of PCB
●
Check the PCB.
15 Below the range of input data from Pressure sensor
●
Check the Pressure sensor wiring connection.
●
Check the output voltage of pressure sensor.
16 Over the range of input data from Pressure sensor
E736 0 Abnormal cascade communication
●
Check the Ready-Link cable.
●
Check the cascade settings.
●
Check PCB version for compatibility.
E740
1
Abnormal outdoor temperature sensor (Open)
(appears only when the outdoor reset curve is
enabled).
●
1. Ensure that the outdoor reset curve is configured
properly.
●
2. Check the outdoor temperature sensor wiring
connection.
2
Abnormal outdoor temperature sensor (Short)
(appears only when the outdoor reset curve is
enabled).
E760 0 Flushing/service alarm
●
A heat exchanger flush is necessary.
E782 0 Abnormal Main-Panel communication
●
Check the PCB.
E785 0 Abnormal Flow Switch Operation
●
Check the Cold Water line.
●
Check the Flow Switch connection.
If any of the above solutions do not resolve the problem with the Water Heater, contact Navien’s Technical department at 1-800-519-8794.
There will be error codes displayed on the front panel and recorded on the PCB board (within the unit) of any problems or failures that occur
with the Water Heater.
IMPORTANT
To reset the Water Heater, either press the [Reset] button on the front panel or disconnect, then reconnect electrical power to the water
heater.
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