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Error code reference

Kenmore Refrigerator Error Code dH

Defective defrost heater

Kenmore codesKenmore refrigerator codes

Defective defrost heater — defrost heater, temperature fuse open, or unplugged connector.

First step from the service manual

Check the door gasket for abnormality, then unplug product, remove Grille Fan assembly, and check defrost control part.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What dH means on a Kenmore refrigerator

The dH error code on a Kenmore refrigerator indicates a fault in the defrost heater circuit. This code is triggered when the control board detects that the defrost heater is not operating as expected during a scheduled defrost cycle. The defrost system is responsible for melting frost buildup on the evaporator coils, and when it fails, ice accumulates and restricts airflow, leading to warm temperatures throughout the refrigerator.

The three primary causes of this code are an open (failed) defrost heater element, a blown thermal fuse (also called a temperature fuse or thermal cutout) in series with the heater circuit, or a disconnected wiring connector at the heater assembly. The thermal fuse is a one-shot safety device that opens permanently if the evaporator area overheats. Once open, it must be replaced. A disconnected connector can occur from vibration or improper reassembly after prior service work.

Diagnosis begins with inspecting the door gasket for any gaps or tears, since a faulty seal allows warm, moist air to enter and causes excessive frost buildup, which can overstress the defrost heater. After confirming the gasket condition, the unit should be unplugged and the grille fan assembly removed to access the defrost control components. From there, the heater element and thermal fuse can be tested for continuity using a multimeter. An open reading on either component confirms the faulty part.

Source: manufacturer service documentation.

Common causes of dH

  1. 01

    Open defrost heater element

    Part replacement

    The defrost heater element itself has burned out and no longer has continuity. Test the heater with a multimeter set to continuity or resistance mode; an open reading confirms the heater needs replacement.

  2. 02

    Blown thermal fuse (temperature fuse)

    Part replacement

    The thermal fuse is wired in series with the defrost heater and acts as a one-time safety cutout. If it has opened due to excess heat, it will show no continuity and must be replaced before the defrost circuit will function again.

  3. 03

    Unplugged or loose wiring connector

    Wiring / connection

    A disconnected connector at the defrost heater assembly will interrupt the circuit and trigger the dH code. Inspect all wiring connectors near the evaporator and heater for proper seating and signs of corrosion or heat damage.

  4. 04

    Defective door gasket

    Part replacement

    A worn or damaged door gasket allows warm, humid air to enter the refrigerator compartment, causing accelerated frost buildup that can overstress the defrost system. Inspect the gasket for tears, gaps, or areas that do not seal flush against the cabinet.

  5. 05

    Faulty defrost control component

    Part replacement

    The defrost control board or defrost timer may be failing to properly initiate or terminate defrost cycles, causing the heater circuit to behave abnormally. This is typically diagnosed after ruling out the heater, fuse, and wiring.

See the test procedure for each cause

Frequently asked questions about dH

What does dH mean on a Kenmore refrigerator?
The dH code indicates a defective defrost heater circuit. It is triggered when the refrigerator detects that the defrost heater is not functioning properly during a defrost cycle. The fault can be caused by an open heater element, a blown thermal fuse, or a disconnected wiring connector in the defrost circuit.
Can I fix the dH error code myself?
A knowledgeable DIYer can address this code by unplugging the refrigerator, removing the grille fan assembly, and using a multimeter to test the defrost heater and thermal fuse for continuity. If either component tests open, it can be replaced. If the wiring connectors are simply loose, reseating them may resolve the issue without any parts replacement.
Is a dH error code on a Kenmore refrigerator a safety concern?
The dH code is not an immediate safety emergency, but it should be addressed promptly. Without a functioning defrost system, frost accumulates on the evaporator coils and blocks airflow, eventually causing the refrigerator and freezer to warm up. This puts food safety at risk if the issue is left unresolved for an extended period.
How much does it cost to repair a dH error code on a Kenmore refrigerator?
Repair costs vary depending on the specific faulty component. A replacement defrost heater element typically costs between $15 and $60 for the part, while a thermal fuse is usually in the $5 to $20 range. If a technician is needed for diagnosis and replacement, total repair costs including labor generally range from $100 to $250 depending on your location and the parts required.
Will resetting the refrigerator clear the dH error code?
Unplugging the refrigerator and restoring power may temporarily clear the dH code from the display, but it will return if the underlying fault in the defrost heater circuit has not been repaired. The code is generated because the control board detects an actual circuit fault, so the root cause must be corrected to permanently resolve the error.

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