York YWHJXH012BAMK-FX, Service Manual

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Poor contact of any line
may lead to communication
malfuntion.
Is there incorrect match
between the main board and the
display panel or between the indoor
and outdoor boards?
Is there
incorrect connection?
Notice:
1. Please make sure the mainboard is qualified before replacement. Please take following test before maintenance:
a. Test if the FUSE1 is short circuit, if so, please replace the fuse tube with same model.
b. Energize and see if the buzzer could buzz normally, if not, the indoor mainboard is damaged.
c. Energize and test with matched display, to see if the display is displaying normally, if not, the indoor mainboard is damaged.
2. Replace same model mainboard and jumper cap with original ones.
3. Keep the same assembly method when replacing.