YORK Control Board 031-01095-002 031-03463-001

Relationship between the two: York 031-01095-002 Microprocessor Motherboard is clearly marked as "W/O EPROM" (without program chip) during factory registration. The motherboard and the EPROM chip are ordered separately. 031-03463-001 is the program chip that comes with this motherboard, installed in the DIP socket on the board, and the label C.P2.01.00 represents the firmware version. The motherboard is responsible for computing and signal processing, while all control logic, unit configuration parameters, safety limits, start-up and shutdown sequences, and communication protocols are provided by this chip - without it or a mismatched version, the motherboard cannot function.
Typical application scenarios: ① After replacing the motherboard, a corresponding version of the program chip needs to be matched and written; ② Version refresh when upgrading the control logic of the unit or fixing known program defects; ③ When the chip is damaged or the program is lost, the unit reports configuration errors and cannot start; ④ Spare parts reserve by maintenance units.
Fault diagnosis: After the unit is powered on, if there is a configuration/program error, abnormal flashing of the motherboard STATUS light, display garbled or no display, inability to save parameters, or inconsistency between the control logic and the actual model, after excluding the motherboard hardware and power supply, it is mostly an EPROM program chip problem or version mismatch.