KitchenAid Dishwasher Error Code SH

The SH code means the dishwasher's diagnostic test has detected a short circuit in the thermistor, which is the water temperature sensor inside the tub. A shorted thermistor sends an abnormally low resistance reading to the control board, which cannot use that signal to regulate water temperature. The code requires inspection of the thermistor, its connector, and the wiring harness connecting it to the control board.

Running the dishwasher with an active SH code is not recommended. Without a functioning temperature sensor, the control board cannot accurately monitor or regulate water temperature during the wash and sanitize cycles. This could result in poor cleaning performance or the heating element operating outside its intended parameters.

A power reset may temporarily clear the SH code from the display, but the fault will return as soon as the control board runs its next diagnostic test and detects the shorted thermistor again. A reset does not address the underlying electrical fault. The thermistor, its wiring, and its connector must be inspected and the defective component repaired or replaced to permanently clear the code.

A knowledgeable DIYer can address this fault by inspecting the thermistor connector for corrosion or damage and testing the thermistor with a multimeter for a near-zero resistance reading. If the thermistor tests shorted, replacing it is a straightforward repair involving disconnecting the harness and swapping the component. If the wiring harness or control board is involved, the repair becomes more complex and may benefit from professional service.

If the thermistor itself is the cause, parts typically cost in the range of $15 to $50 depending on the specific model. Professional labor to diagnose and replace the thermistor generally adds $75 to $150. If the control board is found to be the root cause, board replacement costs can range from $100 to $300 or more for parts alone.