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E4 Discharge Protection
E6 Communication Malfunction
open circuit in the communication
Communication
malfunction
Check if the
communication wire between
indoor unit and outdoor unit is
connected well
Yes
Check if there is
wire between indoor unit and
outdoor unit
No
Check if the
outdoor unit is energized
Yes
Replace the mainboard
47
No
Reconnect the
communication
wire
Yes
Replace the
communication
wire
Energize the
No
outdoor unit
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Troubleshooting
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