Whirlpool TruCool™ Humidity Control Not Working: Crisper... | appliancefaults.com

Technical Background:

The Whirlpool TruCool system utilizes a humidity sensor in the crisper drawer area. The sensor sends a signal to the main control board (MCU). The MCU then adjusts a damper or vent to regulate airflow and maintain the selected humidity level. Voltage paths are typically 5V DC for sensor readings and 12V DC for damper control.

Symptoms:

The crisper drawers in your Whirlpool TruCool refrigerator are not maintaining proper humidity levels. Vegetables and fruits may be drying out or spoiling prematurely, even with the humidity control set appropriately. Homeowner reports crisper drawers feeling the same regardless of humidity settings.

Possible Causes:

Faulty humidity control slider mechanism
Damaged crisper drawer gasket
Defective humidity sensor
Wiring harness issue between sensor and main control board
Main control board (MCU) failure
Blocked vent or air passage

Solution:

1

Unplug the refrigerator or turn off the breaker at the breaker panel.
2

Inspect the humidity control slider mechanism on the crisper drawer. Ensure it moves freely and is not broken. Replace if necessary.
3

Check the crisper drawer gasket for damage or deterioration. Replace if needed. A compromised gasket allows air leakage, affecting humidity levels.
4

Locate the humidity sensor (typically near the crisper drawers). Use a multimeter to check its resistance. Consult the service manual for the correct resistance range at room temperature (e.g., 75°F). A reading outside the specified range indicates a faulty sensor.
5

Inspect the wiring harness connecting the humidity sensor to the main control board. Look for any loose connections, frayed wires, or corrosion. Repair or replace the harness if necessary.
6

If the sensor and wiring are good, suspect the main control board (MCU). Check for 12V DC power to the board using a multimeter. If power is present, the MCU might be faulty and require replacement. This often requires licensed technician diagnostics.
7

Verify the vents and air passages are not blocked by food items or debris. Clean as needed.

Safety Warning:

Disconnect power to the refrigerator before performing any repairs. High voltage (120V AC) is present in the appliance. Follow Lock Out/Tag Out (LOTO) procedures to ensure the power remains off during repairs.

Prevention:

Regularly clean the crisper drawers and surrounding areas to prevent blockages. Inspect the crisper drawer gasket periodically for wear and tear. Avoid overfilling the crisper drawers, which can restrict airflow.

Expert Tip:

Access the refrigerator's service mode (consult the technical sheet - often located behind the kickplate or taped to the back panel - for the specific button sequence) and run a diagnostic cycle. This can help pinpoint the faulty component.

Frequently Asked Questions

•What is the typical resistance range for the humidity sensor at 70°F?

The resistance range varies by model but is typically between 5k ohms and 15k ohms. Refer to the specific service manual for your Whirlpool TruCool model.

•Where is the main control board (MCU) located in the refrigerator?

The MCU is usually located behind the control panel at the top of the refrigerator or behind a rear access panel.

•How do I access the service mode on my Whirlpool TruCool refrigerator?

Service mode access varies by model. Consult the technical sheet for your specific model, usually located behind the kickplate or taped to the back panel. It typically involves pressing a specific sequence of buttons on the control panel.

Whirlpool TruCool™ Humidity Control Not Working: Crisper Drawer Fix

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for the humidity sensor at 70°F?

•Where is the main control board (MCU) located in the refrigerator?

•How do I access the service mode on my Whirlpool TruCool refrigerator?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: