Samsung RF31FM Series Manual page 132

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5. Check the installation status
5-1. Function for failure diagnosis
* Self-diagnosis CHECK LIST
LED
F R
FZ-Sensor Error
FF-Sensor Error
FZ-DEF-Sensor
Error
FF-DEF-Sensor
Error
Ambient-Sensor
Error
Flex room-Sensor
Error
Humidity-Sensor
Error
Item Trouble contents
Display error : separation of
sensor housing part, contact
error, disconnection, short
circuit.
Display error of detecting
temperature of sensor : more
than 149℉(+65℃) or less than
-58℉(-50℃)
Separation of sensor housing
part, contact error,
disconnection, short circuit
Diagnostic method
When measuring the voltage between
the Main PCB CN30-"4" ↔ CN76-"1", it
should read between 4.5V~1.0V.
When measuring the voltage between
the Main PCB CN30-"5" ↔ CN76-"1", it
should read between 4.5V~1.0V.
The voltage of MAIN PCB CN30- "5" ↔
N76-"1": shall be between 4.5V~1.0V
When measuring the voltage between
the Main PCB CN30-"8" ↔ CN76-"1", it
should read between 4.5V~1.0V.
The voltage of MAIN PCB CN78- "8" ↔
CN78-"12": shall be between 4.5V~1.0V
The voltage of MAIN PCB CN78- "9" ↔
CN76-"1": shall be between 4.5V~1.0V
When measuring the voltage between
the Main PCB CN30-"3" ↔ CN76-"1", it
should read between 4.5V~1.0V.
To do list
132