Navien CH-180 Service manual - page 109
Other manuals for CH-180:
Owner's Operation Manual, User's Operation Manual, Installation Manual, Operation Manual, Installation Manual
Manual is about: Combination Water Heater
/ Heating Boiler
of
155
107
Error occurrence conditions and check items
5.27. 40Error
Error
Description
While the boiler power is ON, the system checks the out temperature, and displays
40E error message if the temperature is 122
ı (50ç) or higher.
1. Check if the outdoor temperature sensor is disconnected, and if the connector is
connected properly.
2. Check if the outdoor temperature sensor is defective.
3. Defective PCB.
40E
Short-
circuit of
outdoor
temperature
sensor
Check
items
©Navien America Inc. 2010
CH series service Manual
Version 1.0