York HP Series Service Manual page 120

16.4.20 Communication Malfunction between Indoor Unit and auto-lifting Panel (F7)
Malfunction decision conditions
Possible causes
Communication malfunction between indoor
unit and auto-lifting panel
Check the wire connection between auto-
lifting panel and indoor unit
is it in working order?
YES
Replace the main control of auto-lifting panel.
Has the problem been solved?
NO
Replace the indoor main PCB
Indoor PCB does not get the feedback from the PCB of auto
lifting-panel
● Wiring mistake between indoor PCB and
auto-lifting panel
● Faulty PCB of auto-lifting panel
● Faulty indoor PCB
NO Correct the connection
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