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Error code reference

Norcold Refrigerator Error Code AC HE

AC heaters failed open

Norcold codesNorcold refrigerator codes

AC heaters failed open — AC heater current input falls below 0.5 amperes during a call for cooling in AUTO or AC manual mode.

First step from the service manual

Verify heaters are connected correctly to the power board, then check each heater resistance (73 to 81 ohms).

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

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What AC HE means on a Norcold refrigerator

The AC HE error code on a Norcold refrigerator indicates that the AC heaters have failed open, meaning the electrical circuit through the AC heating elements is broken or severely degraded. The control system monitors current draw during a call for cooling in AUTO or AC manual mode, and when that current falls below 0.5 amperes, the fault is triggered. At the specified heater resistance of 73 to 81 ohms, proper AC heater operation requires a measurable and consistent current draw. A reading below the 0.5 ampere threshold tells the power board that little to no current is flowing through the heater circuit.

The AC heaters are resistive heating elements that play a role in the absorption cooling cycle. When these elements fail open, the circuit is broken at one or more points, preventing current from flowing normally. This can occur due to a burned-out or broken heater element, a disconnected or corroded wiring harness connection at the power board, or physical damage to the heater assembly itself. Because the refrigerator cannot cool effectively without proper heater function, the unit halts the cooling cycle and displays the fault code.

Diagnosis begins at the power board connection points, verifying that the heater wiring harness is fully seated and free of corrosion or damage. From there, each heater element should be tested individually with a multimeter for resistance. A properly functioning AC heater will measure between 73 and 81 ohms. Any reading significantly outside that range, or an open-circuit reading (infinite resistance), confirms a failed heater element that requires replacement.

Source: manufacturer service documentation.

Common causes of AC HE

  1. 01

    Failed open heater element

    Part replacement

    One or more AC heater elements has burned out internally, resulting in an open circuit. Testing the heater with a multimeter will show infinite resistance rather than the expected 73 to 81 ohms.

  2. 02

    Loose or disconnected heater wiring at the power board

    Wiring / connection

    The heater wiring harness connector may have become loose, unseated, or disconnected at the power board, interrupting current flow. Inspect the connection points for proper seating and any signs of corrosion or heat damage.

  3. 03

    Corroded or damaged wiring harness

    Part replacement

    Corrosion, moisture intrusion, or physical damage along the heater wiring harness can create high resistance or an open circuit. Visually inspect the full length of the harness for fraying, melting, or corrosion at connectors.

  4. 04

    Faulty power board

    Part replacement

    If the heater elements test within the correct resistance range and all wiring connections are secure, the power board itself may be failing to supply or accurately measure current to the heater circuit.

See the test procedure for each cause

Frequently asked questions about AC HE

What does AC HE mean on a Norcold refrigerator?
AC HE indicates that the AC heaters have failed open, meaning the current flowing through the AC heater circuit has dropped below 0.5 amperes during a call for cooling in AUTO or AC manual mode. The refrigerator monitors heater current as part of normal operation, and when that threshold is not met, the unit stops the cooling cycle and displays this fault. The issue points to a problem with the heater elements, their wiring, or the connection to the power board.
How do I fix the AC HE error on my Norcold refrigerator?
Start by checking that the heater wiring harness is fully and securely connected to the power board with no signs of corrosion or damage. Next, use a multimeter to test the resistance of each AC heater element individually. A good heater should read between 73 and 81 ohms. Any element showing infinite resistance or a reading far outside that range has failed and will need to be replaced.
Is the AC HE error on a Norcold refrigerator a safety concern?
The AC HE fault itself indicates a failed or open heater circuit rather than an overheating or fire risk. However, any time an electrical component fails or shows signs of heat damage, wiring damage, or corrosion, the system should be inspected carefully before returning it to service. If you notice burned wiring or melted connectors during inspection, do not operate the unit until those issues are resolved.
Will resetting the Norcold refrigerator clear the AC HE error?
A reset may temporarily clear the displayed fault code, but if the underlying problem with the heater circuit is not corrected, the error will return once the unit attempts to cool again and detects insufficient current. The fault condition must be diagnosed and repaired, either by fixing the wiring connection or replacing a failed heater element, before the code will stay cleared.
How much does it cost to repair the AC HE error on a Norcold refrigerator?
Repair costs vary depending on the root cause. If the fix is simply reseating a loose connector, there may be minimal cost beyond a service call fee, which typically ranges from $75 to $150. Replacing one or more heater elements generally adds parts costs on top of labor. If the power board itself is at fault, replacement boards tend to be more expensive, and total repair costs in that scenario could range from $200 to $500 or more depending on the technician and location.

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