MEDIUMError Code
E255: PCB Communication Error (Boiler - Navien)Emergency Diagnosis & Repair
Navien boiler control board communication error between main and display PCBs.
What This Error Code Means
Main control board cannot communicate with display board.
Common Causes
Loose PCB connector
Failed display board
Failed main PCB
Voltage spike
Water damage on PCB
Affected Brands
Navien
How ROMA Heating Fixes This Error Code
Check all connector seating
Inspect boards for damage
Test voltage at connections
Replace display board
Replace main PCB if needed
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