Error Code F4
Ambient temperature sensor is open or shorted
Moderate
Address soon - your appliance may not work properly
Also displayed as: F4 (F-ROOM STEP 4 LED blinking)
What This Means
Sensor connector separation; Contact error at connector; Open circuit in sensor; Short circuit in sensor
What actually causes this:
Failed ambient thermistor or connector issue at CN30
First Thing to Check
Measure voltage at CN30 #2 to #3; should be between 0.5V and 4.5V
Parts Involved
How to Fix
- 1
Check MAIN PCB CN30 connector is properly inserted
- 2
Measure voltage between CN30 pin 2 and pin 3 (should be 4.5V to 0.5V)
- 3
Check IC10 MICOM Pin #49 input voltage
- 4
Verify MICOM #49 matches CN30 #2 to #3
- 5
Replace EXT sensor if out of range
This Error Applies To
Samsung RT21M6215 Series Refrigerators (2017) (2017–present)
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