046Error - Navien NCB-180 Service Manual

5.2.6 046Error

Error occurrence conditions and check items
5.2.7 047Error
Error occurrence conditions and check items
94 NCB Service Manual
Is heat exchanger
thermistor normally
operating?
NO
Is resistance
within normal range?
(refer to page 62)
NO
Replace heat exchanger
thermistor.
Is exhaust thermistor
operating normally?
Yes
Check connector
(#9 and #10 of CN13)
Check connector
Yes
( #3 and #4 of CN 13)
1 step: Flushing, Clean Filter
Yes
2 step: Try to restart
3 step: Replace PCB
NO
Replace exhaust thermistor
Resistance between #9 and #10 of CN13 is from 2kΩ
to 300kΩ at normal condition. (see page 56 for
Wiring Diagram)
Version 1.0