Sub-Zero Refrigerator Error Code 20 2 06

Error code 20 2 06 means the refrigerator detected abnormally high temperatures during a defrost cycle along with an inappropriate response from the bi-metal thermostat, which is the thermal safety device that cuts power to the defrost heater. The fault points specifically to a miswire condition or a mounting problem at the bi-metal. This prevents the defrost system from operating safely and needs to be corrected before defrost cycles can resume normally.

This fault indicates that the defrost heater may be running without proper thermal cutout protection, which creates a risk of excessive heat buildup in the evaporator compartment. Continued operation without addressing the fault could result in damage to surrounding components or, in a worst-case scenario, a safety hazard. It is advisable to address this code promptly rather than continuing normal operation.

If the repair only requires correcting a wiring connection or repositioning the bi-metal, labor costs for a service call typically range from around 100 to 250 dollars depending on your location. If the bi-metal thermostat needs to be replaced, parts costs are generally modest, but total repair costs including labor can range from 150 to 400 dollars. Extensive harness damage or additional related faults found during diagnosis could increase that range.

A knowledgeable DIYer can inspect the bi-metal wiring and mounting position, which are the first recommended diagnostic steps. If the wires are simply disconnected or incorrectly routed, reconnecting them properly may resolve the fault without any parts. However, if the bi-metal itself has failed or the wiring harness is damaged, replacing those components involves working around the defrost heater circuit, which is best handled by a qualified technician.

A reset may temporarily clear the code from the display, but it will not resolve the underlying wiring or bi-metal issue. The fault will return as soon as the refrigerator attempts another defrost cycle and the control board again detects the abnormal temperature response. The root cause must be diagnosed and corrected for the code to stay cleared.