KitchenAid Refrigerator Error Code SH: Sensor Short... | appliancefaults.com

Technical Background:

The MCU (Main Control Unit) monitors the refrigerator temperature sensor voltage. This sensor is typically a thermistor, changing resistance with temperature. The MCU interprets the resistance and adjusts cooling accordingly. Error SH indicates the MCU detects a voltage indicating a very low resistance, suggesting a short circuit.

Symptoms:

The homeowner observes that the refrigerator compartment is either too warm or too cold, and the control panel displays error code SH.

Possible Causes:

Defective refrigerator temperature sensor
Wiring harness damage (shorts to ground)
Loose or corroded wire connections
Faulty MCU (Main Control Unit)

Solution:

1

Disconnect power to the refrigerator at the breaker panel. Verify 0V AC at the refrigerator outlet using a multimeter.
2

Locate the refrigerator temperature sensor. It's usually near the evaporator coil inside the refrigerator compartment, often behind a panel. You may need a 1/4-inch nut driver to remove the panel.
3

Inspect the wiring harness and connections leading to the sensor for any signs of damage or corrosion. Repair any frayed wires with electrical tape or replace sections of the harness as needed. Clean corroded connections with electrical contact cleaner.
4

Use a multimeter set to ohms to test the resistance of the refrigerator temperature sensor. Disconnect the sensor from the wire harness first. A shorted sensor will typically read close to 0 ohms. Normal resistance values vary by model, but typically range from 5k to 10k ohms at room temperature (72°F).
5

If the sensor is shorted, replace it with a new, OEM KitchenAid refrigerator temperature sensor.
6

If the wiring and sensor test good, suspect a faulty MCU. As a last resort, replace the MCU. Ensure the new MCU is properly configured for your specific model. Some MCUs require programming after system.
7

Restore power to the refrigerator and verify that the SH error code is cleared. Monitor the refrigerator temperature for 24 hours to ensure proper operation.

Safety Warning:

Always disconnect power to the appliance before performing any repairs. Use proper Lock-Out/Tag-Out (LOTO) procedures to prevent accidental energization. High voltage is present in the control panel.

Prevention:

Regularly inspect the refrigerator's wiring harness for any signs of damage or wear. Ensure proper ventilation around the refrigerator to prevent overheating, which can stress electronic components.

Expert Tip:

Many KitchenAid refrigerators have a diagnostic service mode. Check the service manual for your specific model. Entering service mode may allow you to directly read sensor values and run component tests, bypassing the error code and making diagnosis easier. Typically involves pressing a specific sequence of buttons on the control panel.

Frequently Asked Questions

•Where exactly is the refrigerator temperature sensor located in my model?

The exact location varies by model. Consult your refrigerator's service manual or a parts diagram for the precise location. Typically it is near the evaporator coils or near the return air duct inside the refrigerator compartment.

•How do I access the MCU (Main Control Unit)?

The MCU is typically located behind an access panel, usually at the top rear or top front of the refrigerator. Disconnect power before accessing. You will likely need a screwdriver or nut driver to remove the access panel.

•What is the correct resistance range for my refrigerator's temperature sensor at room temperature?

The correct resistance range varies by model. Refer to the service manual or a parts website for your specific model to find the correct range. These sensors typically use a 5k or 10k thermistor at 77°F (25°C)

KitchenAid Refrigerator Error Code SH: Sensor Short Circuit Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where exactly is the refrigerator temperature sensor located in my model?

•How do I access the MCU (Main Control Unit)?

•What is the correct resistance range for my refrigerator's temperature sensor at room temperature?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: