Whirlpool WRS325SDHZ Refrigerator Error Code dH: Defrost... | appliancefaults.com

Technical Background:

The "dH" error code on a Whirlpool WRS325SDHZ refrigerator indicates a problem with the defrost cycle. The main control board (MCU) monitors the defrost heater circuit. If the MCU detects that the defrost heater is not functioning correctly (e.g., open circuit, short circuit, or prolonged defrost time), it will trigger the "dH" error code. The MCU supplies 120V AC to the defrost heater through the defrost thermostat.

Symptoms:

US homeowner reports the refrigerator is not cooling properly. The freezer may be working, but the refrigerator compartment is warm. Ice buildup on the back panel of the freezer is visible. The error code "dH" appears on the control panel display.

Possible Causes:

Defective defrost heater
Faulty defrost thermostat
Failed defrost control board (main control board)
Wiring harness issue in the defrost circuit
Blocked defrost drain

Solution:

1

Disconnect power to the refrigerator at the breaker panel.
2

Locate the defrost heater, usually behind the evaporator coils in the freezer section. Use a 1/4-inch nut driver to remove the rear panel.
3

Test the defrost heater for continuity using a multimeter. A reading of infinity (open circuit) indicates a faulty heater.
4

Test the defrost thermostat. It should be closed (0 ohms) when cold and open when warm. Use an ice pack to cool the thermostat for testing.
5

Inspect the wiring harness for any damage, breaks, or loose connections. Repair or replace as needed.
6

Check the defrost drain for ice blockage. Use a hair dryer or hot water to clear any blockages.
7

If the heater, thermostat, and wiring are good, the main control board may be faulty. Replacing the control board may be necessary.

Safety Warning:

Always disconnect power to the refrigerator at the breaker panel before performing any repairs. High voltage is present in the refrigerator's electrical components. Lock-out/Tag-out (LOTO) procedures must be followed to prevent accidental electrocution or injury.

Prevention:

Clean the condenser coils every 6 months to ensure proper heat dissipation. Avoid overpacking the freezer to allow for proper airflow. Regularly check the defrost drain for any signs of blockage.

Expert Tip:

On some Whirlpool models, you can manually initiate a defrost cycle through the service mode. This can help you verify the operation of the defrost heater and thermostat. Refer to the service manual for the specific sequence for your model, which may involve pressing a combination of buttons on the control panel.

Frequently Asked Questions

•What is the resistance range I should expect when testing the defrost heater?

A good defrost heater typically has a resistance between 20 and 50 ohms. A reading outside this range suggests a problem.

•How do I access the service mode to force a defrost cycle?

The specific steps vary by model. A common method involves pressing and holding the "Freezer Temp Down" and "Refrigerator Temp Down" buttons simultaneously for 3-5 seconds. Consult the service manual for your specific model (WRS325SDHZ) for the exact procedure.

•If the defrost drain is frozen, what's the best way to melt the ice without damaging anything?

Use a hair dryer on a low setting or carefully pour hot water down the drain. Avoid using sharp objects or excessive heat, which could damage the drain tube or surrounding components. A turkey baster can help direct the hot water precisely.

Whirlpool WRS325SDHZ Refrigerator Error Code dH: Defrost Cycle Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the resistance range I should expect when testing the defrost heater?

•How do I access the service mode to force a defrost cycle?

•If the defrost drain is frozen, what's the best way to melt the ice without damaging anything?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: