Key Components Description; Pcb - Navien NHB-055 Service Manual

4.9 Key Components Description

4.9.1 PCB

Part
Function
Failure Event
Effects
Error Code
Diagnostic
Color / Number of wires
Version 1.0
Controls each component and monitors the overall performance of the unit.
Malfunctioning PCB.
A component may not operate within the unit and could produce an error code. In most cases of
PCB failure, the whole unit will not operate until the problem is resolved.
E515, E615
Visual inspection: Check wire connections are secure and inspect for wire damage, and/or PCB heat
damage.
Refer to page 63-64
Check Point
NHB Service Manual 65