Samsung AVMKH020EA0 Service Manual page 232

8-2-49. There is no change of EVA IN or a change other indoor unit during the piping check
Outdoor unit display
Indoor unit display
Judgment method
Causes
1. Judge method
1) When error and following errors are flickering
1) 1A3- : MCU No.1 connected to indoor unit No.3 but there is no change of temperature of EVA-IN of indoor unit No.3 during
the piping check.
1) 2B12 : MCU No.2 B connected to indoor unit No.1 but there is the change of temperature of EVA-IN of indoor unit No.2 not
No.1 during the piping check.
2. Check method
1) Check if the address of indoor unit connected with MCU is same and the MCU address setup value.
2) Check if the EEV of indoor unit or MCU is connected with PCB correctly.
3) Check if the EVA IN temperature sensor of indoor unit is separated from the pipe.
4) Check if the EEV coil is inserted correctly.
5) Check if the same error is occurred after pressing the reset key (K3) of outdoor unit and retry piping check.
6) If there is no abnormal with above check items, replace the EEV of the related indoor unit. Be sure to check above items
before the replacement of EEV because the replacement of EEV is a hard work to collect refrigerant of total in the system.
Press the KEY 5(K5) after pipe check to display
- Disconnection and short of MCU temperature sensor
- 231 -
Troubleshooting
and error information.