Error Code WATER-TANK-HEATER-ERROR
Water tank heater has failed or its circuit is broken
Moderate
Address soon - your appliance may not work properly
Also displayed as: F and R blink (water tank heater error — item 30 in self-diagnosis list)
What This Means
Failed water tank heater element; Open bimetal or thermal fuse; Disconnected CN60 wiring; PCB failure
What actually causes this:
The heater that keeps the internal water tank from freezing in cold conditions has failed.
First Thing to Check
Try dispensing water — if it is frozen or very slow, the tank may have frozen solid.
Parts Involved
How to Fix
- 1
Disconnect CN40/CN60 from Main PCB (the manual references CN60 pins 21 and 23 despite the header naming CN40)
- 2
Measure resistance between CN60 pin 21 and pin 23
- 3
Expected: 62 Ω ±7%
- 4
0 Ω = short; ∞ Ω = open — replace heater or trace open circuit to bimetal/fuse
- 5
Check PCB output relay if resistance is correct
This Error Applies To
Samsung RF28T5 Series Refrigerators (2020) (2020–present)
Related Error Codes
Refrigerator compartment temperature sensor is disconnected or dead
Internal humidity sensor has failed or is disconnected
Defrost sensor on freezer evaporator is failed or disconnected
Freezer fan motor is not running or not sending feedback
Supply voltage to compressor is too high
Freezer temperature sensor is failing or disconnected
Ice maker temperature sensor in freezer is failed or unplugged
External room temperature sensor is failed or disconnected