Samsung AM072/096/120/144FXVAFH, Service Manual

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Troubleshooting
4-46 Samsung Electronics
4-4-15 MCU branch part setup error – Connect more Indoor units than what is actually set up in MCU
• Number of indoor units exceeds number of indoor units entered on MCU setting
Criteria
Cause of problem
• Occurs when the number of indoor unit installed exceeds that setting in MCU
Outdoor unit display
Indoor unit display
1. How to check
Check the number of indoor units connected to MCU then readjust the switch for the number of units
After completing resetting, press the outdoor unit's K3 button to reset or turn off to restart.
•
Example of MCU indoor unit setting DIP switch error
ex) Indoor unit No.5 was connected to branch part C, but DIP switch No.3 (branch part C) is off.
Outdoor Unit PCB
Quantity of
Indoor
Quantity of
MCU
Indoor Unit: 4 MCU: 1
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation Defrost Timer Fan Filter/MPI Operation Defrost Timer Filter Operation Timer Turbo 24 ℃ 27 ℃
× × ◑ ◑
×
× ◑ ◑ × × × ◑ ◑ ×
※ ● : ON ◑ : Flash × : OFF
Branch A