Fan Motor - Navien NPE-180A Service Manual

4.11.4 Fan Motor

Part
To provide combustion air into the burner and to purge exhaust flue gas.
Function
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.
Failure Event 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.
Effects 2. Unit vibrating and noise.
3. The water heater is not operating properly.
Error Code E109, E110
1. Visual inspection: check the fan connection wire and/or the fan mounting location.
Diagnostic
2. Voltage check: Check range of voltage shown below.
Black-Red: DC 127V~184 V
●
Black-Yellow: DC 15 V
Color/Number
●
of wires
Black-Orange: DC 0~7.5 V
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Black-White: 0 ~ 7,000 RPM
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Check Point
System Details 61