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Error code reference

LG Refrigerator Error Code 13

Water heater system abnormality

LG codesLG refrigerator codes

Water heater system abnormality - water heater housing missing or electric wire cut.

First step from the service manual

Check water heater housing and wiring for cuts or missing connections.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What 13 means on a LG refrigerator

Error code 13 on an LG refrigerator indicates an abnormality in the water heater system. This is not a cooking or beverage heater, but rather a small resistive heater element built into the water line or water valve housing, used to prevent ice from forming in the water supply path inside the refrigerator. When the control board cannot confirm the heater circuit is intact, it triggers this fault to prevent damage and alert the technician.

The two primary triggers for this code are a missing water heater housing and a cut or broken electrical wire in the heater circuit. A missing housing typically occurs after a previous repair where the component was not reinstalled, or if the housing has cracked and separated from its mounting point. A cut or damaged wire can result from pinching during door or drawer operation, rodent damage, or stress fractures from repeated freezing and thawing cycles in the wiring insulation.

Diagnosis begins with a physical inspection of the water heater housing and the wiring harness connected to it. Technicians should trace the full wire run from the control board connector to the heater terminals, checking for visible cuts, abrasion, or disconnected plugs. If the wiring appears intact, continuity testing with a multimeter across the heater element terminals will confirm whether the element itself is open. A broken circuit at any point in this path will sustain the error code.

Source: manufacturer service documentation.

Common causes of 13

  1. 01

    Damaged or cut electrical wire

    Part replacement

    The wiring harness leading to the water heater element can become pinched, cracked, or severed due to door movement, previous repairs, or cold-related insulation fatigue. Inspect the full wire run for visible damage and test continuity with a multimeter.

  2. 02

    Disconnected wire harness connector

    Wiring / connection

    A plug-in connector on the heater wiring can vibrate loose or become disconnected during a previous service. Check each connector along the heater circuit and reseat any that are loose or partially unplugged.

  3. 03

    Missing water heater housing

    Part replacement

    If the water heater housing was removed during a prior repair and not reinstalled, the control board circuit will not complete correctly. Verify the housing is present and properly seated in its mounting location.

  4. 04

    Failed water heater element

    Part replacement

    The resistive heater element inside the housing can burn out or develop an open circuit, breaking continuity in the heater loop. A multimeter continuity or resistance test across the heater terminals will confirm if the element has failed.

  5. 05

    Cracked or broken heater housing

    Part replacement

    Physical damage to the heater housing itself can interrupt the circuit or cause the control board to register the component as missing. Inspect the housing for cracks, breaks, or separation from its mounting point.

See the test procedure for each cause

Frequently asked questions about 13

What does 13 mean on a LG refrigerator?
Error code 13 on an LG refrigerator signals a water heater system abnormality. Specifically, it means the control board has detected either a missing water heater housing or a cut or broken electrical wire in the heater circuit. This heater is responsible for keeping the internal water line from freezing. The refrigerator will display this code until the wiring and housing are confirmed to be intact and functional.
Can I fix error code 13 on my LG refrigerator myself?
A knowledgeable DIYer can perform the initial inspection, including checking that the water heater housing is present and looking for visible wire damage or loose connectors. If a connector has simply come loose, reseating it may resolve the issue. However, if wiring needs to be spliced or a heater element needs replacement, those repairs are better handled by a qualified technician to avoid creating a safety hazard.
Is error code 13 on an LG refrigerator a safety concern?
A cut wire or missing heater housing in the water circuit is a condition that should be addressed promptly. A damaged wire can potentially cause a short circuit if left unrepaired. The refrigerator's control board flags this code specifically to alert you to the problem before it worsens. Continuing to run the unit without addressing the fault is not recommended.
Will resetting my LG refrigerator clear error code 13?
A power reset may temporarily clear the display, but error code 13 will return if the underlying wiring or housing problem has not been corrected. The control board checks the water heater circuit during normal operation, so any persistent open circuit or missing component will trigger the code again. A permanent fix requires resolving the physical cause first.
How much does it cost to repair error code 13 on an LG refrigerator?
Repair costs depend on what is actually wrong. If only a connector needs to be reseated, there may be no parts cost and minimal labor. Replacing a damaged wiring harness or a failed heater element typically runs between $100 and $300 including parts and labor, depending on your location and service rates. If the heater housing itself needs to be sourced and installed, costs can vary further based on parts availability.

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