Error Code R4
Fresh food compartment temperature sensor is malfunctioning
Moderate
Address soon - your appliance may not work properly
Also displayed as: R4 LED blink
What This Means
Sensor housing separation; Contact error at connector; Sensor wire disconnection; Short circuit in sensor line; Temperature reading above 149°F or below -58°F
What actually causes this:
Common failure points are the connector getting wet or the sensor wire being pinched during shelf installation
First Thing to Check
Check if the refrigerator section is too warm and inspect the sensor connector behind the back wall
Parts Involved
How to Fix
- 1
Measure voltage between MAIN PCB CN30-6 and CN76-1
- 2
Voltage should be between 4.5V and 1.0V
- 3
Inspect sensor connector for proper seating
- 4
Check sensor wiring for breaks or pinches
- 5
Verify sensor is not separated from mounting
Other Error Codes for RF221NCTASL
Humidity monitoring system is not working
Water supply heater for ice maker is not working
Defrost system cannot monitor freezer coil temperature
Ice maker temperature sensor is not working properly
Ice maker is not able to make or dispense ice
Freezer section is not getting circulation air flow
Refrigerator compressor will not operate or is operating abnormally
Refrigerator cannot sense the room temperature