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Error code reference

LG Air Conditioner Error Code CH22

CT 2 (Max CT)

LG codesLG air conditioner codes
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What the CH22 error code actually means

Your LG air conditioner has detected that too much electrical current is flowing through a section of its main circuit board, and it has shut itself off to prevent damage. This can happen because a key internal component like the compressor is working too hard, or because the sensor that monitors current has failed. A qualified technician should inspect the unit before you attempt to restart it.

Diagnostic procedure

The full CH22 procedure

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1
Confirm the fault
Power cycle the unit: switch off the breaker for 60 seconds, then restore power. If the code returns, the fault is persistent and the procedure below isolates the cause.
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Most common causes of CH22

Ranked by how often they cause this code
  1. 1Compressor overcurrent draw
  2. 2Faulty CT2 current transformer sensor
  3. 3Refrigerant charge imbalance
  4. 4Loose or damaged wiring at the PCB
  5. 5Failed outdoor unit PCB

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Questions people ask about CH22

What does CH22 mean on a LG air_conditioner?
CH22 indicates that the CT2 current transformer on the outdoor unit PCB has detected excessively high current in its monitored circuit section. The unit shuts down automatically to protect the compressor and board from damage. This fault can stem from a true overcurrent condition or from a failure within the sensor circuit itself.
Is it safe to keep running my LG air conditioner with a CH22 error?
No. The CH22 fault triggers an automatic shutdown specifically to prevent electrical and mechanical damage. Attempting to continuously restart and operate the unit while this fault is active risks burning out the compressor or damaging the PCB, which can turn a moderate repair into a much more expensive one.
How much does it cost to repair a CH22 error on an LG air conditioner?
Repair costs vary depending on the root cause. Wiring repairs or sensor replacements may fall in the range of $150 to $400 including labor. A compressor replacement is significantly more expensive, typically ranging from $800 to $2,000 or more depending on the system size and refrigerant type. An outdoor PCB replacement generally falls between $300 and $900 in parts and labor.
Can I fix CH22 on my LG air conditioner myself?
Some basic checks, such as inspecting wiring connections and resetting the unit, can be done without special tools. However, diagnosing the root cause requires a clamp meter to measure actual compressor current, refrigerant gauges to check system pressure, and familiarity with PCB components. Most homeowners should contact a certified HVAC technician for a safe and accurate diagnosis.
Will resetting my LG air conditioner clear the CH22 error?
A power reset may temporarily clear the fault display, but if the underlying cause is not corrected, CH22 will return once the unit attempts to operate again. A reset is useful for confirming whether the fault is intermittent, but it is not a repair. The root cause must be identified and resolved to permanently clear the code.

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