74
Installation and Maintenance
Service Manual
6. Communication malfunction (E6)
Main detection points:
●
Check if the connection wire and the built-in wiring of indoor and outdoor unit are connected well and without damage;
●
If the communication circuit of indoor mainboard is damaged? If the communication circuit of outdoor mainboard (AP1) is damaged?
Malfunction diagnosis process:
E6
If the unit operates normally
before malfunction
Check built-in wiring
of indoor and outdoor
unit
If the wiring is
damaged?
Replace the
wire
Check the malfunction
type with communication
malfunction detector
Malfunction of outdoor
communication circuit
Replace outdoor
mainboard AP1
Replace indoor
mainboard AP2
Is the malfunction
eliminated?
Is the malfunction
eliminated?
End
Check the connection
wire according to the
wiring diagram.
Reconnect the wire or
replace the connection
wire according to the
wiring diagram.
Is the malfunction
eliminated?
If the connection wire
is connected well?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
