What the dH Error Code Means on Your LG Refrigerator

Is your LG refrigerator displaying error code dH? Don’t worry, this is a problem that you can fix yourself without the need for a costly service call and we’re here to help you do it!

If you find out that you need any replacement parts for your appliance while you’re troubleshooting, you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

The information in this article may not apply to your specific appliance model. We recommend consulting your manufacturer’s documentation or contact us with any questions.

What the error code means

The LG error code dH refrigerator indicates a defrosting issue, which can affect temperature regulation and lead to ice buildup. This occurs when the defrost heater fails to efficiently melt away frost during the defrost cycle, causing ice to accumulate around vents, evaporator coils, and walls.

Safety precautions

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind: 

• Always power off and unplug your appliance or switch off the circuit breaker before attempting any maintenance or replacement work. This keeps you safe by preventing any risk of injury from electric shock.
• Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.
• Take your time and don’t rush while working to prevent accidents and personal injuries.
• Work in a well-lit area so you can clearly see and access the interior parts.
• Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with bare wet hands. Make sure the work area is completely dry.
• Check your user manual to see if there are specific installation or safety instructions for your part or appliance. 
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.
• Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury. 
• If the appliance has recently been used, give it plenty of time for any heating parts to cool down before working on it. 
• Take pictures or make a note of wiring terminals or other connections before disconnecting to prevent any problems with reassembly.
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.
• Turn off the water supply at the outlet before beginning repairs to any appliance parts that hold water. Have towels ready for any residual water in the system when removing parts. 

Troubleshooting steps

Check the door gasket

1. Inspect the door gasket for any damage, cracks, or deterioration.
2. Ensure the gasket is forming a proper seal around the door frame.
3. Replace the door gasket if it is damaged or not creating a tight seal.

Test the defrost heater

1. Locate the defrost heater, near the back of the freezer compartment.
2. Use a multimeter to measure the resistance of the defrost heater.
3. The normal resistance reading should be between 34-42 ohms.
4. If the reading is outside this range, proceed to the next step.

Test the defrost fuse

1. Locate the defrost fuse, near the defrost heater.
2. Use a multimeter to check the continuity of the fuse.
3. The fuse should read 0 ohms if it is functioning properly.
4. If the fuse reads any other value, replace the fuse.

Check the voltage to the defrost heater

LIVE VOLTAGE WARNING: For this test, the appliance needs to be plugged in and powered on. Please be very careful to protect yourself from electric shock, which has the potential to cause serious injuries. Don’t ever test live voltage if you’re uncomfortable using a multimeter.

1. Locate the main control board and the connection point for the defrost heater (Connection 3, blue and orange wires).
2. Use a multimeter to measure the voltage at this connection point.
3. The voltage should be between 112-116 V AC.
4. If the voltage is within this range, replace the main control board.

Additional information

Thank you for reading! We hope this guide helped you get your LG refrigerator working again.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos. 

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog and more.

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