Jenn-Air Refrigerator Error Code SH

The SH code on a Jenn-Air refrigerator means the control board detected a shorted thermistor input during a diagnostic service test. A thermistor is a temperature sensor that the board uses to monitor compartment temperatures. When the board reads an abnormally low resistance at a thermistor input, it logs the SH fault. The problem may be the thermistor sensor itself, the wiring harness, or corroded connector terminals.

A shorted thermistor input means the control board may not be receiving accurate temperature data, which can lead to improper cooling behavior. Your food could be stored at unsafe temperatures without a visible indication that something is wrong. It is advisable to check actual compartment temperatures with a separate thermometer and address the fault promptly rather than continuing normal use.

A power reset may temporarily clear the SH code from the display, but if the underlying fault with the thermistor, wiring, or connector is still present, the code will return when the refrigerator runs its diagnostic routine again. A reset does not repair a shorted thermistor or damaged harness, so proper diagnosis and repair of the root cause are necessary for a lasting fix.

A knowledgeable DIYer can begin by visually inspecting the thermistor wiring and connector terminals for obvious damage, pinching, or corrosion. Accurate diagnosis requires a multimeter to measure thermistor resistance at the JP2 connector with the connector removed, then at the thermistor terminals in the compartment. If the thermistor or harness needs replacement, those are parts a capable DIYer could swap out, but if the control board is the source of the fault, professional service is recommended.

Repair costs depend on which component is at fault. A replacement thermistor sensor is typically an affordable part, often in the range of $15 to $60 for the component alone. A wire harness repair or replacement may run $30 to $100 or more in parts. A control board replacement is significantly more expensive, often ranging from $150 to $400 or higher for parts, plus labor if a technician performs the work.