4-4-22 SPI Feedback Error
1. How to check
예
Is the SPI connector of an
indoor unit separated from PCB?
Connect the connector to PCB
and reoperate
Yes
No
Replace Main PCB
Can you measure 12V from
#1, #4 power with SPI connector
being connected?
Replace SPI
No
Yes
#1 #4
Outdoor unit display
Indoor unit display
◑(Operation)
◑(Timer)
×(Fan)
◑(Filter)
×(Defrost)
Criteria
• Check if the output of SPI Feedback is 12V
Cause of problem
• SPI defect
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