Communication Error Between Indoor And Outdoor Units During Tracking - Samsung AM017HN1DEH/EU Service Manual

Troubleshooting

4-4-24 Communication Error between Indoor and Outdoor Units during Tracking

Outdoor unit display
Indoor unit display
∙ Communication error between indoor and outdoor units.
Criteria
Cause of problem ∙ Refer to the judgment method below.
1. Cause of problem
Indoor Unit Installation Quantity Setup Switch of
Outdoor Unit Compare and check the set value and the
actual number of indoor units installed.
actual installed indoor units and the set value for the
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.
the indoor response on the display
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.
the 2 cables a square wave with
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.
348
Are the number of
installation quantity setup
switch the same?
Yes
Is there no sign of
during tracking?
Yes
Is the voltage between
DC±0.7V or more?
Yes
No
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.
No
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.
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.
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