Samsung AM160FNBFEB/EU, Training Manual For Installation, Service

Page: 63 / 74

9. Troubleshooting 9. Troubleshooting
Communication Error between Indoor
and Outdoor Units
■ E201
I th b f
No
Check if the number of indoor units set in the
DIP switches on the PCB of the outdoor unit is
the same as that of the actually installed indoor
units.
and Outdoor Units
Is the number of
indoor units set in the DIP switches on the PCB of the outdoor
unit the same as that of the actually
installed indoor units?
Yes
No.
Set the switches on the PCB of the outdoor unit
to the number of the actually installed indoor units and press
Reset key (K3) of the PCB of the outdoor unit to
re-execute tracking.
Press the reset key (K3) of the outdoor PCB,
and check the display module to check for
the quantity of indoor units that respond to
the tracking.
re execute tracking.
Is there no sign of the indoor
response on the display during tracking?
Yes
No.
After 2 minutes, find the indoor unit which
displays the communication error for the
indoor units, and check for overlaps in the
Is the voltage between the
Remove the communication cable which connects the
outdoor unit to the indoor unit, and measure the 2
cables of the outdoor unit with an oscilloscope.
p
PCB address setup. (If the indoor unit
addresses are overlapped, then a communication
error will occur). - In this case, a communication
error will occur in every indoor unit (two or
more units) with the address incorrectly set.
No
s t e o tage bet ee t e
2 cables a square wave with
DC
±
0.7V or more?
Check the communication cable which connects the
o tdoor nit to the indoor nit If there is no
Yes
If there is no abnormality in the address,
check the communication cable and
change the indoor unit PCB.
No.
outdoor unit to the indoor unit. If there is no
abnormality, then connect the indoor units one by one
to find the indoor unit that is interfering with the
communication for inspection and
change the indoor unit PCB.
Check the communication cable
and the connector of the outdoor unit
PCB, and change the PCB.