Navien NCB-180 Service Manual page 6

6. Replacement of Parts
6.1 Replacement Procedure
6.2 Components Replacement Instructions
6.2.1 PCB
6.2.2 Fuse
6.2.3 Fan Motor (Combustion Air)
6.2.4 Flame Rod
6.2.5 Ignition Transformer
6.2.6 APS
6.2.7 Main Gas Valve
6.2.8 Condensate Trap
6.2.9 Flow Sensor
6.2.10 Circulation Pump
6.2.11 3-way Valve
6.2.12 Water Pressure Sensor
6.2.13 Space Heating Strainer
6.2.14 Auto Feeder Valve
6.2.15 DHW Heat exchanger
7. Components Diagram and Part List
7.1 Case Assembly
7.2 Burner Assembly
7.3 Waterway Assembly
7.4 Fan (Gas) Assembly
8. Inspection and Maintenance Schedule
8.1 Annual Servicing
8.2 Maintenance Report
8.3 Maintenance Schedules
8.4 Inspection Report
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