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LG Refrigerator 33 — Compressor / defrost test fault

LG Refrigerator · Error code 33

What 33 Means

Error 33 is the second step of the compressor relay self-test, indicating the compressor or its drive circuit failed the second check. Often appears together with 22 when the compressor is failing.

Symptoms

  • 33 on display, often after a 22
  • No cooling
  • Compressor inactive or short-cycling
  • Inverter board may show no LED activity

Common Causes

1
Compressor failed second start attempt

Linear compressor inability to maintain stroke.

2
Inverter board failure

Drive electronics intermittent.

3
Main control board issue

If a fresh inverter and compressor don't clear it.

4
Open compressor winding

Internal compressor electrical failure.

How to Fix It

  1. Confirm whether the unit is in service test mode (two beeps = test step) — that's normal.
  2. If 33 appears during normal use, check linear compressor warranty (10-year for 2014–2022 US).
  3. Have a tech ohm the compressor windings; out-of-spec readings = compressor failure.
  4. Swap the inverter board first as a low-cost test.
  5. Replace compressor under warranty when confirmed bad.
  6. After repair, allow 24 hours and confirm 33 clears.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement Linear compressor View on Amazon→ Common replacement Inverter PCB View on Amazon→

More LG Refrigerator Codes

22 22 — Compressor relay / inverter control fault 67 67 — Door open / not fully closed 88 88 — Power-on display test (not a fault) Er CF Er CF — Condenser Fan Fault Er CO Er CO — Compressor / Communication Fault Er dH Er dH — Defrost Heater Fault

All LG codes → All refrigerator codes →

Verified against manufacturer documentation: lg.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.