Kenmore Refrigerator Error Code SH: Sensor Short Circuit... | appliancefaults.com

Technical Background:

The main control unit (MCU) monitors the refrigerator temperature sensor via a voltage divider circuit. The sensor's resistance changes with temperature, altering the voltage signal sent back to the MCU. The MCU interprets this voltage to maintain the set temperature. An "SH" error indicates the MCU is detecting a short circuit (low resistance) from the sensor.

Symptoms:

My Kenmore refrigerator is displaying an "SH" error code. The refrigerator doesn't seem to be cooling properly, and I'm worried about my food spoiling.

Possible Causes:

Faulty Refrigerator Temperature Sensor
Short Circuit in Sensor Wiring
Defective Main Control Board (MCU)
Loose Wiring Connections at Sensor or MCU
Moisture Intrusion in Sensor Housing
Rodent Damage to wiring.

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 typically behind a panel inside the refrigerator compartment. You may need a 1/4-inch nut driver to remove the panel.
3

Visually inspect the sensor wiring and connections for any signs of damage, corrosion, or loose connections.
4

Using a multimeter, measure the resistance of the refrigerator temperature sensor. Refer to the Kenmore service manual for the correct resistance value at a known temperature (typically around 32F). A short circuit will read near zero ohms.
5

If the sensor resistance is significantly off or reads zero ohms, replace the sensor with a new Kenmore-approved sensor.
6

If the sensor tests okay, check the wiring harness between the sensor and the main control board (MCU) for shorts or opens. Use a multimeter to check continuity. The harness is usually located in the back of the refrigerator.
7

If the wiring is good, suspect a faulty main control board (MCU). Consider replacing the MCU, although this is a less common failure.

Safety Warning:

Always disconnect power to the refrigerator at the breaker panel before performing any repairs. Lock Out/Tag Out (LOTO) procedures should be followed. Some components may store a high voltage charge even after the power is disconnected.

Prevention:

Regularly inspect the refrigerator's interior for moisture buildup. Ensure proper door seal to prevent condensation. Avoid placing hot items inside the refrigerator. Clean the refrigerator coils twice a year with a vacuum to improve efficiency and reduce strain on components.

Expert Tip:

Many Kenmore refrigerators have a service mode that allows you to manually test sensors and components. Consult the service manual for instructions on accessing the service mode. Common sequence might involve holding a button combination like 'Door Alarm' and 'Energy Saver' for 5 seconds.

Frequently Asked Questions

•Where is the refrigerator temperature sensor typically located in a Kenmore refrigerator?

The refrigerator temperature sensor is usually located behind a panel inside the refrigerator compartment, often near the top. Some models may have it near the cooling coils.

•What is the expected resistance range for a functioning refrigerator temperature sensor at room temperature (70F)?

The resistance varies by model, but typically falls within the range of 2,000 to 10,000 ohms at 70F. Refer to the Kenmore service manual for the precise value for your specific model.

•How can I access the service mode on my Kenmore refrigerator to diagnose the 'SH' error code further?

Accessing the service mode varies by model. Consult the Kenmore service manual for your specific model. A common method involves pressing and holding a combination of buttons, such as 'Door Alarm' and 'Energy Saver', simultaneously for approximately 5 seconds. The control panel display should change to indicate the service mode is active.

Kenmore Refrigerator Error Code SH: Sensor Short Circuit Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the refrigerator temperature sensor typically located in a Kenmore refrigerator?

•What is the expected resistance range for a functioning refrigerator temperature sensor at room temperature (70F)?

•How can I access the service mode on my Kenmore refrigerator to diagnose the 'SH' error code further?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: