Key Component Descriptions; Pcb - Navien NCB300-28K Service Manual

4.7 Key Component Descriptions

4.7.1 PCB

Item
Function Controls each component and monitors the overall performance of the unit.
Fault PCB malfunction
A system component may not operate and generate an error code. In most PCB failures, the boiler will not
Symptoms
operate until the fault is resolved.
Error codes E515, E615
Diagnostics Visual inspection: Check wire connections are secure and inspect for wire damage, and/or PCB heat damage.
Testing/inspection
information
Description
System Details 37