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

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Troubleshooting
4-62 Samsung Electronics
1. Low pressure sensor Open / Short error determination method
1) Identifies from when power is supplied or 2 minutes after RESET, and only when set is stopped.
2) An Open / Short error will occur if the input voltage standard range of 0.5V~4.95V is exceeded.
2. How to check
غ
AM038/048/055KXWD
✳✳
Outdoor unit display
Indoorunit display
Duct, Cassette (1/2 Way),Console, Celing Cassette (4/Mini4 Way) Wall-mounted (NeoForte)
Operation Defrost Timer Fan Filter/MPI Operation Defrost Timer Filter 18
℃
21
℃
Turbo 24
℃
27
℃
◑ × × ◑ × ◑ × ◑ × ◑ × × ◑ ×
※ ● : ON ◑ : Flash × : OFF
Judgment Method
∙ Refer to the how to check below..
Cause of problem ∙ Disconnection or breakdown of relevant sensor.
Low pressure sensor error (Open / Short)
(cont.)
Replace low pressure sensor
Restart after connecting the connector to the PCB
No
Yes
Did the high pressure sensor connector breakaway
from the PCB?
Charge the refrigerant after vacuum
No
Yes
Is there refrigerant inside the set?
(Please check by connecting the manifold gauge to
the service valve)
Replace PCB
No
Yes
Out of the PCB low pressure sensor terminals,
is there voltage between pins (3 and 4) 5V?
The
ف
mark is the 1st pin on the PCB.