Samsung CH070EAMC, Service Manual

Page: 109 / 126

Samsung Electronics
Troubleshooting
12-3-5 Communication error between indoor and outdoor after initial power input.
No
After setting the indoor unit installation setting
number switch correctly, re-perform the
tracking by pressing the reset key K3 of
outdoor unit PCB
If the indoor unit number installed is one, set the
outdoor unit switch forward to "0", "1"

"0" and "1" spell the connection of an indoor unit.
Yes
Yes
Yes
Press the reset key K3 of outdoor unit
PCB and check the display to check the
number of indoor units answering to the
tracking
After connecting again the communication line
connecting from outdoor unit to indoor unit,
check this communication is reverse or not,
and if there is no fault, find the indoor unit
preventing communication through connecting
indoor units each by each, and then
exchange the indoor unit PCB after line check
Check the setting value of
indoor unit installation number setting
switch of outdoor PCB and actual indoor unit
installation numbers
To measure the 2 lines of outdoor unit side by
use of scope after removing the communication
line connecting from outdoor unit to indoor unit
Is equal indoor unit actual
installation number and installation
number setting switch?
At this time, is the voltage
between lines rectangular wave over
DC±0.7V?
When tracking, is there any
indoor answer from display part?
No
If address is not fault
exchange the indoor unit PCB after
communication line check.
Multi type
After 2 minutes, check if PCB address setting
of indoor unit displayed the communication error
among indoor units is overlapped or not .
(If the indoor unit address is overlapped, the
communication error is occurred.)
- In this case, the communication error is
occurred to over two indoor units set wrong
Outdoor unit display
Indoor unit display
How to determine
Reason of error
(
Tracking error)
(Operation) (Timer) (Airflow) (Filter)
Mismatching the communicating indoor unit and setting switch indoor numbers When outdoor tracking
Communication error between the indoor unit and outdoor unit, and installation number switch
setting miss
12-10