Navien NPE-240A Service Manual

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

Navien NPE-240A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Energy Efficiency	97%
Voltage	120V
Ignition Type	Electronic
Maximum Input	199, 900 BTU/h
Water Connection Size	3/4"
Gas Connection Size	3/4"
Warranty	15-year on heat exchangers, 5-year on parts, 1-year on labor
Dimensions	17.3" W x 13.2" D x 27.4" H