Navien NR-10P User Manual page 27

Error Code Reason
E028 Pipe leak on heating side
Exhaust Overheat: exhaust high limit
switch shuts down the unit when the
E030
flue temperature exceed 149°F (65°C)
Abnormal activity of the gas
E035
pressure sensor
Communication failure
E036
Water leak Inside unit
E037
Abnormal the flow sensor.
E039
Outdoor Temperature Sensor – short
E040
(display only computer board)
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Self-diagnostic / Action
1. Check pipes on heating side
1. Turn OFF the system for at least 30 minutes
then restart
2. Clean the DHW cold water inlet filter.
3. Check the heat exchanger; remove and clean
with a cleaning solution.
1. Check gas line.
1. Contact to Navien tech. dept.
1. Close DHW cold water main.
2. Replace leaking parts.
1. Check the water flow sensor
1. Check Outdoor sensor
2. Replace
If any of the above solutions do not resolve the problem with the combination boiler,
contact 'Navien 's Technical department
There will be error codes displayed on the remote controller and on the PCB board
(within the unit) of any problems or failures that occur with the combination boiler.".
NOTE: To reset the combination boiler, either unplug and re-plug the electric supply or if a
remote controller is installed, press the power button of the remote controller "OFF" then "ON".
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