Whirlpool WRF535SWHZ Refrigerator Error Code dH: Defrost... | appliancefaults.com

Technical Background:

The main control board monitors the defrost system components. The 'dH' error code indicates the board has detected an issue with the defrost heater circuit, most likely an open circuit or very high resistance. The board sends 120V AC to the defrost heater during the defrost cycle. It then monitors current flow to confirm the heater is working.

Symptoms:

The refrigerator is not defrosting properly. Ice buildup is visible on the back wall of the freezer. Food in the freezer may be partially thawed and refrozen. The 'dH' error code is displayed on the control panel.

Possible Causes:

Defective defrost heater.
Faulty defrost thermostat.
Wiring harness issue between the control board and defrost heater.
Failed main control board.
Defrost heater element burned open.

Solution:

1

Unplug the refrigerator from the 120V AC outlet.
2

Locate the defrost heater, usually behind the rear panel inside the freezer compartment. Remove the panel using a 1/4-inch nut driver.
3

Visually inspect the defrost heater element for breaks or burns. Also check the defrost thermostat (bi-metal) for continuity using a multimeter.
4

If the heater looks intact, use a multimeter to test the heater's resistance. A normal heater will usually show a resistance reading of around 20-50 ohms. An open circuit (OL) indicates a failed heater.
5

Check the defrost thermostat for continuity when cold (below 40 degrees F). It should be closed. If open, replace it.
6

Inspect the wiring harness for any loose connections or damaged wires.
7

If the heater and thermostat test good, suspect the main control board. Replace the board as a last resort.

Safety Warning:

Disconnect power to the refrigerator before performing any repairs. Use proper Lock-Out/Tag-Out (LOTO) procedures to prevent accidental energizing of the circuit. High voltage is present in the defrost system. Exercise caution when testing components.

Prevention:

Periodically check the freezer for excessive ice buildup. Avoid overfilling the freezer, which can restrict airflow and contribute to defrosting issues. Ensure the door seals are clean and sealing properly.

Expert Tip:

After replacing the defrost heater or thermostat, you can manually initiate a defrost cycle through the service mode to verify the repair. This is usually done by pressing a specific combination of buttons on the control panel, consult service manual for exact sequence.

Frequently Asked Questions

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

The service mode is typically accessed by pressing a specific sequence of buttons on the control panel within a short timeframe. Refer to the service manual for the Whirlpool WRF535SWHZ model for the exact sequence.

•What is the typical lifespan of a defrost heater?

The lifespan of a defrost heater can vary, but they generally last between 5-10 years. Factors like frequency of defrost cycles and the condition of other components can affect their longevity.

•Where can I find a replacement defrost heater for this model?

You can find replacement defrost heaters at most appliance parts retailers, both online and in physical stores. Be sure to specify the Whirlpool WRF535SWHZ model number to ensure compatibility.

Whirlpool WRF535SWHZ Refrigerator Error Code dH: Defrost Heater Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

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

•What is the typical lifespan of a defrost heater?

•Where can I find a replacement defrost heater for this model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: