Malfunction Of Communication E6 - Lennox LI036CI-180P432 Service Manual

6.Malfunction of communication 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:
Cut off power supply. Check if
connection line of IDU and ODU
and the wire inside electric box
are correctly connected.
Correct connection?
Main board matches
with display board? Main board of
IDU matches with that of ODU?
Communication cord is damaged?
Replace IDU's
main board
Malfunction eliminated?
60
Start
Connect the line
no
according to
wiring diagram.
yes
no
yes
yes
no
no
yes
End
Malfunction eliminated?
no
Match correctly
Malfunction eliminated?
according to product
specification
no
Replace
Malfunction eliminated?
communication
cord
no
Replace ODU's
main board.
Service Manual
yes
yes
yes
Installation and Maintenance