Navien NPE-240A Service Manual

Version 2.21
64 NPE Service Manual
4.11.7 APS
Part Check Point
Function Detecting the air pressure entering the burner system.
Failure Event
1. Combustion noise occurs.
2. Imperfect and/or abnormal flame occurs.
3. Occurs when APS does not detect proper voltage.
Effects
1. The water heater is not operating.
2. Produces excessive carbon monoxide emissions.
Error Code E110
Diagnostic
1. Visual inspection: Connection and/or breakage of wires.
2. Voltage check: Check range of voltage shown below.
3. Check the exhaust duct for obstruction or blockages.
4. Check the condensate trap and drain piping for obstruction or blockages.
5. Check for decreased hot water output.
Color/Number
of wires
●
RED-BLACK: DC 5 V
●
WHITE-BLACK: DC 0.3 ~ 4.5 V

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