Navien NP-180 Service Manual page 84

Does the fan moter have
normal operation voltage?
Yes
Is there any pulse output from
the fan motor?
Yes
Replace PCB
©Navien America Inc. 2010
No Check power and connector
Check the voltage between black and red wire of
CN 8: 120 - 180VDC
No Replace fan assembly
Check the voltage between black and white wire of
CN 8: 2 - 8VDC
82
NR/NP series service Manual Version 2.0