Fan Motor - Navien NFC-175 Service Manual

4.12.4 Fan Motor

Part
Function
Failure Event
Effects
Error Code
Diagnostic
Color / Number of wires
Version 1.0
Provides combustion air into the burner and purges exhaust flue gas.
Maintains the gas input with a long vent run, the fan operates with APS for ideal combustion.
1. Fan speed failure: the fan RPM is around 0 RPM.
2. The fan assembly screw is loose and/or the fan is disassembled.
3. Disconnected or defective fan connection terminal assembly.
1. Unstable combustion condition.
2. Unit vibrating and noise.
3. The boiler is not operating properly.
E109, E110
1. Visual inspection: check the fan connection wire and/or the fan mounting location.
2. Voltage check: Check range of voltage shown below.
Black-Red: DC 127 V ~ 184 V
●
Black-Yellow: DC 15 V
●
Black-Orange: DC 0 ~ 7.5 V
●
Black-White: 0 ~ 6,700 RPM
●
Check Point
NFC Service Manual 55