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

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Troubleshooting
4-84 Samsung Electronics
Refrigerant leakage error
(cont.)
1. 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
Replace pressure sensor
Restart after connecting the connector to the PCB
No
Yes
Did the 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 pressure sensor terminals, is there
voltage between pins (3 and 4) 5V?
Outdoor unit display
(Refrigerant leakage judgment before starting)
(When start, refrigerant leakage judgment)
Judgment Method
∙ Before starting : Before compressor starting after system halt 2 minutes (High & low pressure sensor Open / Short error occurs
and1kg/
㎠
or less)
∙ When start : When the high pressure sensor value(cooling 3.1kg/
㎠
, heating 2.2kg/
㎠
) is detection continuously for 3 seconds
Cause of problem
∙ Refrigerant leakage and shortage
∙ Disconnection or breakdown of high & low pressure sensor
غ
AM038/048/055KXWD
✳✳
The
ف
mark is the 1st pin on the PCB.