ERROR
LEDS
OPERATION TIMER STANDBY
POSSIBLE CAUSE SYSTEM BEHAVIOUR SOLUTION
E3
F F F
Communication error between the out-
door unit and the indoor unit
Fan is stopped and flap is closed
after 30 seconds of missing com-
munication.
The system restarts automatically
as soon as the communication is
recovered.
Check that connections between C1
and C2 on outdoor and indoor terminal
block are correct (C1 terminals con-
nected together, C2 terminals connect-
ed together).
Check that a shielded communication
cable has been used.
Check that the dip-switch SW2 for com-
munication address setting is in the
correct position.
Check that all earth cables are proper-
ly connected to every terminal.
Check that the shield of the communi-
cation cable is properly connected to
every terminal.
Check the communication fuse on out-
door and indoor unit.
Check that the outdoor unit has power
supply and that it is working.
Check that all PCBs are powered on.
Be sure that power supply has not
been connected to the communication
terminals.
Check that there are no burnt signs on
the PCBs, in particular close to commu-
nication cables.
Check that the fan motor is not dam-
aged and it doesn’t create short circuit
on the indoor PCB.
