GE Refrigerator Error Code F516

F516 is a Hot Water Thermistor Fault code. It means the two thermistors monitoring the hot water system have reported temperatures that differ by more than 10°F after 60 seconds of heating. The refrigerator's control board detects this discrepancy and flags the error because it cannot confirm which sensor is accurate. The fault points to a problem with one of the thermistors, its wiring, or its connectors.

The F516 code specifically affects the hot water dispensing system. The refrigeration and freezing functions are on separate systems and should continue to operate normally. However, it is best to avoid relying on the hot water dispenser until the fault is diagnosed and repaired, as the control board cannot confirm accurate water temperature during this fault condition.

A reset may temporarily clear the F516 code, but it will return if the underlying fault is still present. Because the error triggers after 60 seconds of heating when the thermistor differential exceeds 10°F, the control board will detect the problem again the next time the hot water system operates. A proper repair of the faulty thermistor or wiring is necessary to permanently resolve the code.

A knowledgeable DIYer can perform the initial diagnostic steps, including visually inspecting both hot water thermistors and checking the wiring harness for damage or loose connectors. If the problem is a corroded connector or a loose wire, that repair may be straightforward. Replacing a thermistor is also a manageable repair for someone comfortable working with appliance wiring, but if the control board is at fault, that replacement is more involved and may be better handled by a technician.

Repair costs depend on the root cause. If the issue is a loose or corroded connector, the cost may be minimal, covering only a service call fee in the range of $75 to $150. Replacing a thermistor typically costs between $20 and $60 for the part, plus labor if a technician performs the work. A control board replacement, if needed, is the most expensive scenario, with parts and labor potentially ranging from $200 to $500 or more depending on the model.