046Error - Navien NFC-175 Service Manual

5.2.7 046Error

Error occurrence conditions and check items
5.2.8 047Error
Error occurrence conditions and check items
88 NFC Service Manual
Is high limit switch normally
operating?
No
Is resistance within
normal range?
(refer to page 53)
No
Replace heat exchanger
thermistor.
Is exhaust thermistor
operating normally?
Yes
Check connector
(#1 and #2 of CNJ1)
Yes
Check connector
(#13 and #14 of CNJ1)
1 step: Flushing, Clean Filter
Yes
2 step: Try to restart
3 step: Replace PCB
No
Replace exhaust thermistor
Resistance between #1 and #2 of CNJ1 is
from 2kΩ to 300kΩ at normal condition.
(see page 50-51 for Wiring Diagram)
Version 1.0