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Error code reference

Frigidaire Refrigerator Error Code Er dH

Defrosting sensor has not reached over 46°F (8°C) after 1 hour of defrosting, indicating possible temperature…

Frigidaire codesFrigidaire refrigerator codes

Defrosting sensor has not reached over 46°F (8°C) after 1 hour of defrosting, indicating possible temperature fuse disconnection, heater disconnection, drain jam, or poor relay for heater.

First step from the service manual

Enter TEST 3 MODE and check voltage between pins 10 (BO) and 2 (BL) of CON3 for 115 VAC.

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

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What Er dH means on a Frigidaire refrigerator

The Er dH error code on a Frigidaire refrigerator indicates a defrost cycle failure. Specifically, the defrost sensor did not detect a temperature above 46°F (8°C) within one hour of the defrost cycle beginning. This tells the control board that the evaporator coil is not being heated adequately during defrost, which is a critical function for preventing excessive frost buildup that would block airflow and impair cooling performance throughout the refrigerator and freezer compartments.

The defrost system relies on several components working in sequence: the defrost heater warms the evaporator coil, the defrost sensor monitors the temperature rise, and a thermal fuse acts as a safety cutoff. If any link in this chain is broken, the sensor will never register the required temperature threshold. The four most common failure points are a blown thermal (temperature) fuse, a disconnected or open-circuit defrost heater, a jammed or blocked defrost drain that may be freezing solid, or a faulty relay responsible for supplying power to the heater.

The first diagnostic step is to enter TEST 3 MODE on the control board and measure the voltage between pin 10 (BO) and pin 2 (BL) on connector CON3. A reading of 115 VAC confirms that the control board is correctly sending power to the defrost circuit. If 115 VAC is present but the heater is not activating, the fault lies downstream in the heater, fuse, or wiring. If voltage is absent, the relay or control board itself may be the source of the problem.

Source: manufacturer service documentation.

Common causes of Er dH

  1. 01

    Blown Thermal Fuse

    Part replacement

    The thermal fuse is a one-time safety device that cuts power to the defrost heater if temperatures exceed a safe limit. Once blown, it cannot reset and must be replaced. It can be tested for continuity with a multimeter.

  2. 02

    Failed or Open-Circuit Defrost Heater

    Part replacement

    The defrost heater element itself may have burned out or become disconnected from its wiring harness. A multimeter continuity test across the heater terminals will confirm whether the element is open and needs replacement.

  3. 03

    Faulty Heater Relay

    Part replacement

    A relay on the control board or relay board is responsible for switching power to the defrost heater. If this relay fails to close, the heater receives no power even when the board commands a defrost cycle. Checking for 115 VAC at pins 10 and 2 of CON3 in TEST 3 MODE helps isolate this issue.

  4. 04

    Jammed or Frozen Defrost Drain

    Wiring / connection

    If the defrost drain is blocked by ice or debris, meltwater has nowhere to go and can refreeze around the heater and evaporator, insulating them enough to prevent adequate temperature rise. Inspect the drain pan and drain tube for blockages.

  5. 05

    Defrost Sensor Failure

    Part replacement

    Although less common, the defrost sensor itself may be faulty and reporting inaccurate temperatures to the control board, triggering the Er dH code even when the heater is functioning correctly. The sensor's resistance values should be verified with a multimeter against the expected specifications.

See the test procedure for each cause

Frequently asked questions about Er dH

What does Er dH mean on a Frigidaire refrigerator?
Er dH means the defrost cycle failed to raise the evaporator temperature above 46°F (8°C) within one hour. This indicates a problem in the defrost circuit, which can include a blown thermal fuse, a failed defrost heater, a faulty relay, or a blocked defrost drain. The refrigerator detected the failure and stored this code to alert you that the defrost system needs attention. Left unaddressed, frost buildup on the evaporator will eventually reduce or completely block cooling.
Can I fix the Er dH error code myself?
Some steps are DIY-friendly, such as clearing a blocked defrost drain or checking wiring connections to the heater and fuse for obvious disconnections. Testing the defrost heater and thermal fuse for continuity with a multimeter is also manageable for someone comfortable with basic electrical testing. However, diagnosing a faulty relay or control board and performing the TEST 3 MODE voltage check at connector CON3 requires more experience with appliance electronics, so a professional technician may be the better choice for those steps.
Is it safe to keep using my refrigerator when Er dH is displayed?
Continuing to run the refrigerator with an Er dH error is not recommended for extended periods. Without a working defrost cycle, frost will accumulate on the evaporator coil and progressively block airflow. This will cause the refrigerator and freezer to warm up, potentially spoiling food. Address the error as soon as possible to prevent food loss and avoid secondary damage to other components.
Will resetting the refrigerator clear the Er dH code?
A power reset may temporarily clear the Er dH code from the display, but it will not fix the underlying defrost system failure. The code will return once the refrigerator attempts another defrost cycle and again fails to reach the required temperature threshold. A proper repair of the faulty component, whether the heater, thermal fuse, relay, or drain, is required to resolve the error permanently.
How much does it cost to repair an Er dH error on a Frigidaire refrigerator?
Repair costs vary depending on which component has failed. Replacing a thermal fuse is typically the least expensive fix, with parts generally ranging from $10 to $30 and minimal labor time. A defrost heater replacement can cost between $30 and $80 in parts. If the control board or relay board requires replacement, costs can range from $100 to $300 or more for the part alone. Adding professional labor, total repair bills commonly fall somewhere between $100 and $400 depending on the diagnosis.

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