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

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Troubleshooting
Samsung Electronics 4-61
4-4-24 Low Pressure sensor error (Open/Short)
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. Inspection Method
Replace Low Pressure sensor
Please re-inspect after connecting
the connector to the PCB
No
Yes
Low pressure
sensor connector (CN41)
connected to PCB?
Refill 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.
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 Operation Timer Turbo
× × ◑ ◑ ◑
×
◑ ◑ ◑ ● ◑ ◑
※ ● : ON ◑ : Flash × : OFF
Judgment Method ∙ Refer to the judgment method below.
Cause of problem
∙ Disconnection or breakdown of relevant sensor.