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Error code reference

LG Hvac Error Code CC

13 SEER Flex Multi (with dual single speed compressors) EEPROM error; too much combined capacity of IDUs in…

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13 SEER Flex Multi (with dual single speed compressors) EEPROM error; too much combined capacity of IDUs in relation to ODU (130% maximum).

First step from the service manual

IDU EEPROM is small PCB the size of a thumbnail; part will be referred to as PCB, Options on LG's parts system.

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

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What CC means on a LG hvac

The CC error code on LG 13 SEER Flex Multi systems with dual single-speed compressors indicates an EEPROM configuration error tied to capacity mismatch. Specifically, this error is triggered when the combined cooling or heating capacity of all connected indoor units (IDUs) exceeds 130% of the outdoor unit's (ODU) rated capacity. LG Flex Multi systems are designed to tolerate some degree of over-connection, but once the combined IDU capacity surpasses this 130% threshold, the outdoor unit's control board detects the imbalance through EEPROM data and locks out operation to prevent compressor damage.

The EEPROM involved in this error is a small programmable memory chip mounted on a compact PCB roughly the size of a thumbnail. In LG's parts system, this component is listed under the category of PCB Options. Each IDU contains one of these EEPROM boards, which stores critical unit identification and capacity data that the outdoor unit reads during initialization. If the EEPROM data is corrupt, misconfigured, or reflects an IDU lineup that collectively exceeds the 130% capacity ceiling, the CC code will appear.

Diagnosing this error requires auditing the total BTU capacity of every IDU connected to the ODU and comparing the combined figure against 130% of the ODU's rated capacity. If the total falls within range, attention should shift to inspecting each IDU's EEPROM PCB for physical damage, poor seating, or data corruption. A faulty or incorrectly programmed EEPROM in even one IDU can cause the system to misreport combined capacity totals, triggering this fault.

Source: manufacturer service documentation.

Common causes of CC

  1. 01

    Combined IDU capacity exceeds 130% of ODU capacity

    Wiring / connection

    If the total BTU ratings of all connected indoor units add up to more than 130% of the outdoor unit's rated capacity, the CC error will trigger. Audit each IDU's BTU rating and sum them against the ODU spec.

  2. 02

    Faulty or corrupted IDU EEPROM PCB

    Part replacement

    The small thumbnail-sized EEPROM PCB inside an indoor unit may have lost its programming or developed a fault, causing it to report incorrect capacity data to the outdoor unit. This component is listed as PCB Options in LG's parts system.

  3. 03

    Improperly seated EEPROM PCB

    Wiring / connection

    The EEPROM board may have become loose or partially unseated from its connector, leading to intermittent or failed communication with the IDU control board. Inspecting and reseating the EEPROM PCB in each indoor unit is a key early step.

  4. 04

    Incorrect IDU added to existing system

    Wiring / connection

    A new indoor unit may have been added to the system without accounting for the cumulative capacity impact, pushing the total over the 130% limit. Review the full system configuration any time a new IDU is installed.

  5. 05

    EEPROM programmed with wrong capacity data

    Wiring / connection

    If an EEPROM PCB was replaced previously and programmed with incorrect capacity values, the outdoor unit may calculate a false total that triggers the CC fault. Confirm that EEPROM data matches the actual IDU model specifications.

See the test procedure for each cause

Frequently asked questions about CC

What does CC mean on a LG hvac?
The CC error on an LG 13 SEER Flex Multi system with dual single-speed compressors indicates an EEPROM-related capacity mismatch. The outdoor unit has detected that the combined capacity of all connected indoor units exceeds 130% of its own rated capacity. This can also be triggered by a faulty or corrupted EEPROM PCB inside one of the indoor units. The system will not operate normally until the configuration is corrected.
Can I fix the CC error code on my LG Flex Multi system myself?
If the error is caused by an over-capacity IDU configuration, a knowledgeable installer can resolve it by removing or replacing indoor units to bring the total within the 130% limit. If the issue is a faulty EEPROM PCB, the repair involves locating and replacing the small thumbnail-sized board inside the affected indoor unit, listed as PCB Options in LG's parts system. This type of repair requires familiarity with multi-split system wiring and component identification, so professional service is recommended if you are not experienced with HVAC electronics.
Is it safe to keep running my LG system while the CC error is active?
No, you should not attempt to run the system while the CC error is active. The error indicates a configuration or EEPROM problem that could lead to improper compressor loading. Continued operation under these conditions risks damaging the compressors in the outdoor unit. Leave the system off until the root cause has been identified and corrected.
How much does it cost to repair a CC error on an LG multi-split system?
Repair costs vary depending on the cause. If the issue is simply a capacity configuration problem requiring no parts, you may only pay for a technician's diagnostic and labor time, typically in the range of $75 to $200. If an EEPROM PCB needs replacement, parts and labor combined could range from $150 to $450 or more depending on your region and the specific indoor unit involved. A full system reconfiguration involving additional indoor unit changes would add further cost.
Will resetting the LG system clear the CC error code?
A power reset may temporarily clear the CC error display, but the fault will return if the underlying cause has not been resolved. If the total IDU capacity still exceeds 130% of the ODU capacity, or if a faulty EEPROM PCB remains in place, the outdoor unit will detect the issue again on the next initialization cycle. A reset alone is not a fix and should not be relied on as a solution.

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