Fan Motor - Navien NCB-180 Service Manual

4.9.4 Fan Motor

Part
Function
Failure Event
Effects
Error Code
Diagnostic
Color/Number of wires
To provide combustion air into the burner and to purge exhaust flue gas.
To maintain 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 127V~184 V

Black-Yellow: DC 15 V

Black-Orange: DC 0~7.5 V

Black-White: 0 ~ 7,000 RPM

Check Point