Troubleshooting
Samsung Electronics 4-15
■ Communication error between indoor and outdoor unit (E-201)
Indoor unit installation quantity setup switch of
outdoor unit compare and check the set value and
the actual number of indoor units installed.
Are the number of
actual installed indoor
units and the set value
for the installation
quantity setup switch
the same?
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.
Is there no sign of
the indoor response on
the display during
tracking?
Correctly set the indoor unit installation quantity
setup switch of the outdoor unit, and press the
reset key (K3) of the outdoor PCB to re -execute
tracking.
Yes
No
No
Yes
Remove the communication cable which connects
the outdoor unit to the indoor unit, and measure
the 2 cables of the outdoor unit with a scope.
Is the voltage between
the 2 cables a square
wave with DC ± 0.7V
or more?
Check the communication cable which connects
the outdoor unit to the indoor unit. If there is no
peculiarity, 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.
After 2 minutes, find the indoor unit which displays
the communication error for the indoor units, and
check for overlaps in the 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.
Yes
No
Change the indoor unit PCB after checking the
communication cable when there is no peculiarity
with the address.
Check the communication cable and the connector
of the outdoor unit PCB, and change the PCB.
No
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