4-4-50 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
Did the Low Pressure sensor connector
get disconnected from the PCB?
Refill refrigerant after vacuum
No
Yes
Is there refrigerant inside the set?
(Please check by connecting the menu
folder 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 ▼ mark is the 1st pin on the PCB.
Outdoor unit display
Indoor unit display
Operation Timer
Criteria
Refer to the judgment method below.
Cause of problem
Disconnection or breakdown of relevant sensor.
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