Samsung AC052MN4DKH Service Manual page 78

System air conditioner 4 way cassette series
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Is service valve fully opened?
Is the indoor EVA sensor correctly connected?
Is refrigerant charged?
Replace the inverter PCB.
Samsung Electronics
(Continue)
Yes
Yes
Yes
Yes
No
No
Reconnect the sensor connector.
No
Charge the refrigerant.
Troubleshooting
Open the valve.
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