Name: Navien NHB-110
Brand: Navien
Rating: 4 (1 reviews)

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NHB Service Manual 71

Version 1.0

4.9.7 APS

Part Check Point

Function Detects the air pressure in the combustion 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 boiler is not operating.

2. Produces excessive carbon monoxide emissions.

Error Code E110

Diagnostic

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.

Color / Number of wires

●

RED-BLACK: DC 5 V

●

WHITE-BLACK: DC 0.3 ~ 4.5 V

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