Samsung AM072FXVAFH series Service Manual page 284

4) Pressure sensor (Independent installation)
Inspection item : High/Low Pressure sensor of the independent installed Outdoor Unit.
Error code: None (The resulting report "Undetermined")
Determine the status of the Pressure sensor of the independent installed Outdoor Unit before the compressor start.
If the judgment of Outdoor Unit Pressure sensor is "Undetermined" : Checking in accordance with the following order.
Vacuum mode of Outdoor Unit
Check the pressure sensor breakdown
Is Pressure sensor connector properly connect?
Is voltage 5V between
3, 4 pin of PCB Pressure sensor terminal?
Is deviation of outdoor
unit as following?"High pressure Max
/Min deviation : less than 2"
Off the vacuum mode of Outdoor Unit
[Caution]
- If the Outdoor Unit with a history of operation (Auto Trial Operation inclusion) : Maintain the vacuum mode for more than 5 minutes.
Samsung Electronics
Yes
Yes
Yes
Complete
※ Check the Pressure sensor breakdown after the saturation pressure
of the outdoor temperature or connect the manifold gauge to check the pressure.
No
No
No
Confirmation and Measures
Replace Hub PCB
Replace PCB
Test Operation
9-7