Sub-Zero Refrigerator Error Code EC 64: How to Fix It

Q: What does EC 64 mean on a Sub-Zero refrigerator?

EC 64 on a Sub-Zero refrigerator means the ice maker mold thermistor has been detected as shorted. The mold thermistor is a temperature sensor on the ice maker that tells the unit when the ice is ready to be harvested. A short circuit in this sensor causes the ice maker to stop working and triggers the EC 64 fault code on the display.

Q: Will my Sub-Zero refrigerator still cool food if it shows EC 64?

Yes, in most cases the refrigerator and freezer compartments will continue to cool normally even when EC 64 is displayed. The error is isolated to the ice maker mold thermistor circuit, so the main refrigeration system typically remains unaffected. However, your ice maker will stop producing ice until the fault is resolved.

Q: Can I reset the EC 64 error code on my Sub-Zero?

You can attempt a reset by turning off the refrigerator using the interior power switch or by unplugging it for 60 seconds. If the EC 64 code clears after the reset and does not return, the fault may have been caused by a temporary electrical glitch. However, if the code returns after the reset, the underlying hardware fault (usually the mold thermistor) must be repaired before the error will permanently clear.

Q: How much does it cost to fix a Sub-Zero EC 64 error?

If you repair it yourself, the main cost is the replacement ice maker mold thermistor or ice maker assembly, which typically ranges from $50 to $200 depending on your Sub-Zero model. If you hire a Sub-Zero certified technician, total repair costs including parts and labor typically range from $200 to $500 or more, depending on your location and the specific model being serviced.

Q: How do I find my Sub-Zero model number to order the right thermistor?

Your Sub-Zero model number is printed on a label located inside the fresh food (refrigerator) compartment, typically on the upper left wall or along the door frame. The label shows both the model number and serial number. Use the model number when searching for compatible replacement parts to ensure you get the correct thermistor for your specific unit.

Abstract

Error code EC 64 on a Sub-Zero refrigerator indicates that the ice maker mold thermistor has detected a short circuit. The mold thermistor is a small temperature sensor inside the ice maker that monitors the temperature of the ice mold to control the freezing and harvest cycles. When this sensor shorts out, the ice maker cannot accurately regulate its cycle, which typically causes the ice maker to stop producing ice entirely.