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LG Aircon CH33 Error Code

Capture the LG CH33 fault correctly, then see what should be checked before parts are quoted. Match the model first; some rows are unofficial or mean different things.

What does LG CH33 mean?

LG CH33 is listed as excessive rise of standard compressor discharge temperature, master outdoor unit: Compressor 2 discharge temperature rose excessively, and slave 1 outdoor unit: Compressor 2 discharge temperature rose excessively in VRF, Cassette, Ducted rows such as LG Multi V 5 commercial VRF. Official and unofficial listings both cover this code, so the model family decides which one the diagnosis follows. Do not collapse this code across model families; use the model, series, or system type to choose the right row. Confirm the exact model, series, or signal row before accepting a parts quote.

What to do now

Use these steps before customer action, a sensor check, or PCB quote.

  • Stop using the unit if CH33 returns

    If CH33 remains displayed or returns during operation, do not attempt a reset the manufacturer does not list; arrange diagnosis.

  • No manufacturer reset steps listed for CH33

    Capture the complete CH33 display and model stickers first. The manufacturer lists no customer reset procedure; do not treat a generic power-cycle as manufacturer guidance.

  • Send these to us

    CH33 error code, a clear display photo, LG model stickers, affected rooms, operating state when the code appeared, when the fault appears, and exact model so the source can be cross-checked

Choose the listing that matches your unit

The same code has more than one listed meaning. Match the model family, the system type and the unit that shows the code before approving parts.

  • Code
    CH33
    What it means
    Excessive rise of standard compressor discharge temperature.
    What to check first
    Match this meaning to your installed model and the unit that shows the code, then use the checks below.
  • Code
    LG Multi V 5 commercial VRF — master outdoor unit: Compressor 2 discharge temperature rose excessively
    What it means
    master outdoor unit: Compressor 2 discharge temperature rose excessively
    What to check first
    Match this meaning to your installed model and the unit that shows the code, then use the checks below.
  • Code
    LG Multi V 5 commercial VRF — slave 1 outdoor unit: Compressor 2 discharge temperature rose excessively
    What it means
    slave 1 outdoor unit: Compressor 2 discharge temperature rose excessively
    What to check first
    Match this meaning to your installed model and the unit that shows the code, then use the checks below.
  • Code
    LG Multi V 5 commercial VRF — slave 2 outdoor unit: Compressor 2 discharge temperature rose excessively
    What it means
    slave 2 outdoor unit: Compressor 2 discharge temperature rose excessively
    What to check first
    Match this meaning to your installed model and the unit that shows the code, then use the checks below.

Guidance for your model

Notes that match the code to your exact model. Electrical, refrigerant, wiring, resistance and component checks are for a technician.

  • Detail
    Diagnostic note
    What it says
    Excessive rise of standard compressor discharge temperature. If over 105C, check refrigerant charge.
  • Detail
    Diagnostic note
    What it says
    Record 331 and confirm that the master outdoor unit reported it. Avoid repeated resets and arrange pressure, airflow, valve, sensor, refrigerant-circuit, and compressor checks before approving a repair.
  • Detail
    Diagnostic note
    What it says
    Record 332 and confirm that the slave 1 outdoor unit reported it. Avoid repeated resets and arrange pressure, airflow, valve, sensor, refrigerant-circuit, and compressor checks before approving a repair.
  • Detail
    Singapore / model note
    What it says
    Unattributed LG fault-code list; confirm against the installed model/service manual before applying.
  • Detail
    Singapore / model note
    What it says
    LG Singapore lists Multi V 5, but the installed unit nameplate and matching service manual control. Do not apply this row to Multi V i or another LG family.

What to check before repair

Use this split to separate safe evidence capture from the tests a technician should prove before quoting parts.

  • You can check
    Before taking any system action on CH33, take a clear display photo.
    Technician should confirm
    Confirm which sensor CH33 maps to on the exact model table.
  • You can check
    Capture the LG indoor and outdoor model stickers so the correct family row is used.
    Technician should confirm
    Measure the sensor value against the service-manual resistance or voltage range.
  • You can check
    The manufacturer lists no customer reset procedure for this code. Note whether one room, several rooms, or the whole system is affected.
    Technician should confirm
    Check connector condition, harness continuity, and PCB input before replacing boards.

Sensor or PCB decision

LG CH33 is usually repair-first if a sensor or harness reading is confirmed. Board replacement should wait until the sensor circuit is tested.

  • Sensor replacement is usually targeted when resistance or voltage readings are out of range.

  • Harness or connector damage can look like a sensor fault until continuity is checked.

  • PCB replacement is a later step if the sensor and wiring test correctly.

LG CH33 questions

What does the LG CH33 error mean?
LG CH33 is listed as excessive rise of standard compressor discharge temperature, master outdoor unit: Compressor 2 discharge temperature rose excessively, and slave 1 outdoor unit: Compressor 2 discharge temperature rose excessively in VRF, Cassette, Ducted rows such as LG Multi V 5 commercial VRF. Official and unofficial listings both cover this code, so the model family decides which one the diagnosis follows. Do not collapse this code across model families; use the model, series, or system type to choose the right row. Confirm the exact model, series, or signal row before accepting a parts quote.
Can I fix a LG CH33 error myself?
No. CH33 needs a technician's measurement before parts are decided. Before taking any system action on CH33, take a clear display photo. Capture the LG indoor and outdoor model stickers so the correct family row is used.
Is it safe to keep running the aircon with a CH33 error?
If CH33 remains displayed or returns during operation, do not attempt a reset the manufacturer does not list; arrange diagnosis.
What causes a LG CH33 error?
LG CH33 has a listed meaning that depends on the exact model and on which unit shows the code. Use the decoder on this page before assuming a specific cause.
Will a LG CH33 error need a repair or a full replacement?
LG CH33 is usually repair-first if a sensor or harness reading is confirmed. Board replacement should wait until the sensor circuit is tested.
What should I send a technician about a LG CH33 error?
Before booking, send: CH33 error code, a clear display photo, LG model stickers, affected rooms, operating state when the code appeared, when the fault appears, and exact model so the source can be cross-checked.

Where to go next

Confirm the fault

Share the error code, model number and symptoms so we can assess the likely cause.