Aps - Navien NHB-055 Service Manual

4.9.7 APS

Part
Function
Failure Event
Effects
Error Code
Diagnostic
Color / Number of wires
Version 1.0
Detects the air pressure in the combustion system.
1. Combustion noise occurs.
2. Imperfect and/or abnormal flame occurs.
3. Occurs when APS does not detect proper voltage.
1. The boiler is not operating.
2. Produces excessive carbon monoxide emissions.
E110
1. Visual inspection: Check wire connections are secure.
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.
RED-BLACK: DC 5 V
●
WHITE-BLACK: DC 0.3 ~ 4.5 V
●
Check Point
NHB Service Manual 71