Error Code 66
The door handle heater is not working
Moderate
Address soon - your appliance may not work properly
Also displayed as: 66
What This Means
Door handle heater connector disconnected; Door handle heater burned out or open circuit; Temperature protection fuse opened; Main PCB relay defect
What actually causes this:
The heating element failed or the wire came loose
First Thing to Check
Check if condensation or frost is forming on the door handle — that indicates heater failure
Parts Involved
How to Fix
- 1
1. After separating Main PCB CN51 wire, measure resistance between CN51 1 and 2
- 2
2. Normal resistance should be 135 ohm ± 7%
- 3
3. 0 ohm indicates short circuit
- 4
4. Infinite ohm indicates open or broken connection
- 5
5. Replace heater if out of specification
Other Error Codes for RF28M9580
The freezer fan is not working
The main control board can't talk to the display
The ice bucket heater is not working
The FlexZone compartment has gotten too warm
The humidity monitoring sensor is not working
The outdoor temperature sensor is not working
The FlexZone defrost sensor is failing and defrost cycles may not work
The freezer defrost sensor is failing and defrost cycles may not work