4828-0100594 Apr 2026

: Look for the number printed directly on the green or blue solder mask of the board. It may be accompanied by a secondary manufacturer part number (often starting with "HK" or "CE").

: Ensure the plastic standoffs or mounting screws are secure. Do not overtighten, as this can crack the PCB traces. 4828-0100594

If you are replacing this board, follow these industry-standard steps: : Look for the number printed directly on

Are you seeing a specific or diagnostic light pattern on the board that I can help you decode? Do not overtighten, as this can crack the PCB traces

: Primarily found in industrial air handlers or chillers. Check your unit’s model nameplate to ensure this board is the correct revision for your specific serial number.

: Most boards in this series feature status LEDs. A steady blink usually indicates "Heartbeat" (normal operation), while specific patterns (e.g., 2 blinks, pause) indicate error codes defined in the unit’s wiring schematic.