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Error code reference

LG Heat Pump Error Code 22

Max CT

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What the 22 error code actually means

Your LG heat pump has detected that it is drawing more electricity than it is designed to handle, or its internal sensor thinks it is, so it shut itself off to prevent damage. This could mean a component like the compressor is working too hard, or the electrical sensor that measures current may have failed and is giving a false reading. Either way, the system needs professional diagnosis before it is safe to restart.

Diagnostic procedure

The full 22 procedure

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1
First diagnostic step
Verify if detected current value is truly over the limit; if not, check current detection circuit and replace PCB.
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Most common causes of 22

Ranked by how often they cause this code
  1. 1Compressor overcurrent draw
  2. 2Faulty current transformer sensor
  3. 3Failed or damaged main PCB
  4. 4Wiring fault in current detection circuit
  5. 5Refrigerant circuit overload

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Questions people ask about 22

What does 22 mean on a LG heat_pump?
Error code 22 on an LG heat pump is a Max CT fault, indicating the current detection circuit has measured amperage exceeding the system's maximum allowable current limit. The unit shuts down automatically to protect components from damage. The cause is either a genuine overcurrent condition, often from a stressed compressor, or a faulty current detection circuit producing a false reading.
Is it safe to keep running my LG heat pump when error code 22 appears?
No, you should not attempt to bypass or ignore error code 22. The system shuts down because it has detected or sensed a current level that could damage the compressor, PCB, or other electrical components. Continuing to force the unit to run under these conditions risks permanent component failure or an electrical hazard.
How much does it cost to repair error code 22 on an LG heat pump?
Repair costs vary significantly depending on the root cause. PCB replacement typically falls in the range of $200 to $600 including parts and labor. Compressor replacement is considerably more expensive, often ranging from $800 to $2,000 or more depending on the unit size and labor rates in your area. A diagnostic service call is the first step and usually runs $75 to $150.
Can I fix error code 22 on my LG heat pump myself?
Some preliminary checks, like inspecting wiring connections in the current detection circuit, can be done by a knowledgeable DIYer. However, diagnosing the compressor amperage, testing the current transformer, and replacing the PCB requires electrical knowledge and proper equipment. Because this fault involves high-voltage components, professional service is strongly recommended for most homeowners.
Will resetting my LG heat pump clear error code 22?
A power reset may temporarily clear the fault display, but the error code 22 will return if the underlying cause has not been resolved. If the compressor is drawing excessive current or the detection circuit is faulty, the condition will persist and the unit will continue to shut down. A reset alone is not a repair and does not address the root cause.

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