Refrigerant Leakage Error - Samsung AM072FXVAFH series Service Manual

4-4-37 Refrigerant leakage error

Outdoor unit
display
∙ Before starting : Before compressor starting after system halt 2 minutes
Judgment
(High & low pressure sensor Open / Short error occurs and 1kg/cm2 or less)
Method
∙ When start : When the high pressure sensor value(cooling 3.1kg/ ㎠ , heating 2.2kg/ ㎠ ) is detection continuously for 3 seconds
Cause of
∙ Refrigerant leakage and shortage
∙ Disconnection or breakdown of high & low pressure sensor
problem
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. Inspection Method
Is the pressure sensor connector
connected to the PCB ?
Is there refrigerant inside the set?
(Please check by connecting the menu
folder gauge to the service valve)
Out of the PCB Pressure
sensor terminals, is there voltage between
pins 3 and 4 5V?
Replace Pressure sensor
Samsung Electronics
(Refrigerant leakage judgment before starting)
(When start, refrigerant leakage judgment)
Yes
Yes
Yes
No
Please re-inspect after connecting
the connector to the PCB
No
Refill refrigerant after vacuum
No
The mark is the 1st pin on the PCB.
Troubleshooting
Replace PCB
4-83