Navien CH-180, Service Manual, Page: 57 / 155

55
Error
Code
Reason Reset
E016
E018
E019
E021
E022
E027
E028
E030
E035
E036
E039
E040
E048
Self-diagnostic / Action
1. Turn OFF the system for at least 30 minutes
then restart
2. Clean the inlet water filter
3. Check the heat exchanger; flush with a
cleaning solution
1. Check the Thermistor
2. Check for loose connection
3. Replace the Thermistor
1. Check the Thermistor
2. Check for short or water in connection
3. Replace the Thermistor
1. Check the Thermistor
2. Check for loose connection
3. Replace the Thermistor
1. Check the Thermistor
2. Check for short or water in connection
3. Replace the Thermistor
1. Clean the inlet water filter
2. Check the heat exchanger; flush with a
cleaning solution.
1. Measure gas pressure drop
2. Check hose connection
3. Replace GPS.
1. Check the vent pipe for obstructions
2. Check and clean the air filter
1. Check the Thermistor
2. Replace the Thermistor
1. Check the LPG Gas.
2. Fill the LPG Gas.
1. Check pipe line.
1. Contact to Navien tech. dept.
1. Check the water flow sensor.
Overheating of heat
exchanger
Heating return inlet:
Thermistor–open
Heating return inlet:
Thermistor–short
Cold water inlet:
Thermistor–open
Cold water inlet:
Thermistor–short
Exhaust Overheat:
exhaust high limit
switch shuts down the
unit when the flue
temperature exceed
149°F (65°C)
Abnormal activity of the
gas pressure sensor
Abnormal activity of the
air pressure sensor
Outdoor:
Thermistor–short
Abnormal LPG Gas
Pres-sure
Water leak pipe line
Communication failure
Abnormal the Water
Flow Senor
Manual
Manual
Manual
Manual
Manual
Manual
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
© Navien Ameri c a I n c . 20 1 0 CH series servi c e Manua l Version 1 .0