Navien CH-180 Operation Manual page 43

Combination water heater operation
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Error Code Guide
Error
Code
E015 Abnormal PCB board
E016 Overheating of heat exchanger
E018 Space heating return:
Thermostat - open
E019 Space heating return:
Thermostat-short
E021 DHW cold water inlet:
Thermostat -open
E022 DHW cold water inlet:
Thermostat -short
E027 Abnormal activity of the air pressure
sensor
E028 Pipe leak on heating side
E030 Exhaust Overheat: exhaust high limit
switch shuts down the unit when the
flue temperature exceed 149°F
(65°C)
E035 Abnormal activity of the gas pressure
sensor
E036 Communication failure
E037 Water leak Inside unit
E039 Abnormal the flow sensor.
Outdoor Temperature Sensor – short
E040
(display only computer board)
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 water heater.
NOTE: To reset the combination water heater, 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".
Reason
1. Check power supply
2. Check the power switch
1. Turn OFF the system for at least
2. Clean the DHW cold water filter
3. Check the heat exchanger; remove
1. Check the Thermostat.
2. Replace the Thermostat.
1. Check the Thermostat.
2. Replace the Thermostat.
1. Check the Thermostat.
2. Replace the Thermostat.
1. Check the Thermostat.
2. Replace the Thermostat.
1. Check the exhaust & intake air
2. Check and clean the intake air
1. Check pipes on heating side
1. Turn OFF the system for at least
2. Clean the DHW cold water inlet
3. Check the heat exchanger; remove
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
Self-diagnostic / Action
30 minutes then restart
(part#25)
and clean with a cleaning solution
pipe for obstructions
filter.
30 minutes then restart
filter.
and clean with a cleaning solution.
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