046Error - Navien NPE-180A Service Manual

5.1.6 046Error

Error occurrence conditions and check items
5.1.7 047Error
Error occurrence conditions and check items
Is heat exchanger
thermistor normally
operating?
NO
Is resistance
within normal range?
(refer to page 59)
NO
Replace heat exchanger
thermistor.
Is exhaust thermistor
operating normally?
Resistance between #9 and #10 of CON6 is from 2kΩ
to 300kΩ at normal condition. (see page 52 for
Yes
Wiring Diagram)
Check connector
(#9 and #10 of CON6)
Yes
Check connector
( #1 and #2 of CON 6)
1 step: Flushing, Clean Filter
Yes
2 step: Try to restart
3 step: Replace PCB
NO
Replace exhaust thermistor
Troubleshooting 93