Aps - Navien NPE-180A Service Manual

4.11.7 APS

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