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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 relation to ODU (130% maximum).

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What the CC error code actually means

This error means the air conditioner's outdoor unit is detecting that too many or too large of indoor units are connected to it, exceeding what the system is designed to handle. It can also be caused by a tiny memory chip inside one of the indoor units that has failed or lost its programming. The system shuts down to protect the compressor until the issue is corrected.

Diagnostic procedure

The full CC procedure

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1
First diagnostic step
IDU EEPROM is small PCB the size of a thumbnail; part will be referred to as PCB, Options on LG's parts system.
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Most common causes of CC

Ranked by how often they cause this code
  1. 1Combined IDU capacity exceeds 130% of ODU capacity
  2. 2Faulty or corrupted IDU EEPROM PCB
  3. 3Improperly seated EEPROM PCB
  4. 4Incorrect IDU added to existing system
  5. 5EEPROM programmed with wrong capacity data

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Questions people ask 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.
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.
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.
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.
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.

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