Frigidaire Refrigerator Error Code SH (FZ)

SH (FZ) means the control board has detected a shorted freezer thermistor circuit. The thermistor is the sensor that monitors temperature inside the freezer compartment. When the board reads an abnormally low resistance from that circuit, it logs this fault code to indicate that temperature sensing is unreliable. The issue may be in the thermistor itself or in the wiring connected to it.

Operating the refrigerator with an active SH (FZ) code is not recommended for extended periods. Because the control board cannot accurately read the freezer temperature, the compressor and fans may run incorrectly, leading to temperature swings that can compromise food safety. It is best to address the fault promptly and use a standalone thermometer to monitor freezer temperature in the meantime.

Repair costs vary depending on what is causing the fault. If only a wiring repair or connector reseating is needed, labor costs may be relatively modest, typically in the range of $75 to $150 for a service call. Replacing the freezer thermistor is generally an inexpensive parts repair, with the part itself often ranging from $15 to $50 plus labor. A control board replacement, if required, can bring total repair costs to $200 to $400 or more depending on the model and service rates in your area.

Some causes of this error are DIY-accessible, such as inspecting visible wiring for damage, reseating connector pins, and checking for ice buildup around the thermistor harness. However, accurately diagnosing a shorted thermistor versus a wiring fault requires a multimeter to measure resistance values. If you are not comfortable working with electrical components or accessing the freezer's internal wiring, a qualified technician should perform the diagnosis.

A power reset may temporarily clear the displayed code, but if the underlying wiring fault or thermistor failure is still present, the SH (FZ) code will return once the control board re-evaluates the circuit. A reset is useful for confirming whether the fault is intermittent, but it does not repair the root cause and should not be treated as a fix.