Friedrich FSHW091, Service And Parts Manual

Page: 124 / 171

124 PB
TROUBLESHOOTING
Malfunction of Communication E6
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:
Start
Cut off power supply. Check if
connection line of IDU and ODU
and the wire inside electric box
are correctly connected.
Correct connection?
IDU matches with that of ODU?
Communication cord is damaged?
Main board matches
with display board? Main board of
main board
Replace IDU's
Malfunction eliminated?
End
Connect the line
according to
Match correctly
wiring diagram.
according to product
specification
communication
Replace
cord
Replace ODU's
Malfunction eliminated?
main board.
Malfunction eliminated?
Malfunction eliminated?
yes
yes
yes
yes
yes
yes
no
yes
no
no
no
no
no
no