Navien Flame Inspection Window 30030928A

The flame inspection window is a Navien component for the NCB300 and NCB500 combi boiler families. It provides a viewing point into the combustion chamber so the burner flame can be observed during commissioning, servicing and fault diagnosis. The part is identified by Navien part number 30030928A.

• The viewing glass is cracked, chipped or crazed, preventing a clear view of the flame.
• Heavy sooting or staining on the glass obscures flame observation even after cleaning.
• Condensation or moisture is trapped behind the glass.
• The window seal is perished, hardened or visibly leaking.
• The window assembly is loose in its housing or no longer seats correctly.

• Confirm your boiler model against the fitment list above.
• Check the serial number of your appliance, as fitment is listed by serial number range.
• Inspect the existing window and seal for damage so the correct component is replaced.
• Compare the part number on the existing component with 30030928A.