Troubleshooting
Samsung Electronics9-73
■
: Communication error between the outdoor unit and MCU
Outdoor unit display is flickering.
Indoor unit display is flickering.
Judgment method
Causes
- Installed MCU quantity set-up error in the outdoor PCB.
- MCU address setting was overlapped.
Compare actual installed MCU
quantity with setting value of outdoor PCB.
Are the actual number
of MCU installed and the setting value of
MCU installation number setup
switch the same?
Restart the tracking by pressing the
reset key(K3) of outdoor unit PCB after
setting correctly MCU installation number
setup switch of outdoor unit.
Press the reset key(K3) of
outdoor unit PCB and check the number of
MCU responding to tracking.
Is not the address of connected
MCU the same setting?
Set the address each MCU differently.
After checking the communication line connected from
the outdoor unit to MCU. And if there is no error,
connect MCU one by one to find MCU interrupting the
communication and replace PCB after checking the
communication line.
No
No
Yes
Yes
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