Error Code 40
Ice maker compartment fan not working
Critical
Stop using immediately - risk of damage or safety issue
Also displayed as: 40C
What This Means
Fan connector not seated at Main PCB CN52 pins 1-6; Fan motor wire damaged or disconnected; Fan motor defective (bearing stuck, motor failed); Main PCB defective or fan relay faulty
What actually causes this:
Ice maker fan motor failed or ice accumulation restricts blade
First Thing to Check
Check if ice maker compartment temperature is controlled properly
Parts Involved
How to Fix
- 1
1. Unplug and inspect CN52 connector pins 1-6
- 2
2. Check for loose or corroded connections
- 3
3. Reseat connector firmly
- 4
4. Power on and listen for fan operation
- 5
5. Measure voltage at CN52-1 to CN52-6 — normal 7V to 12V
- 6
6. If voltage present but fan inoperative, replace ice maker fan
- 7
7. If voltage abnormal, check Main PCB
This Error Applies To
Samsung RF22N9781 Series Refrigerators (2018) (2018–present)
Related Error Codes
Freezer temperature sensor malfunction
Room temperature sensor not working
Ice maker temperature sensor failure
Fridge temperature sensor is not responding
Convertible zone temperature sensor failure
Ice storage area temperature sensor malfunction
Freezer defrost sensor is faulty
Convertible zone defrost sensor malfunction