LG · Refrigerator Critical

33 — Compressor / defrost test fault

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.

Keep using it?
No — service first
DIY difficulty
Hard
Verified against
lg.com ↗

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.

Why it happens

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

  • Compressor failed second start attempt Linear compressor inability to maintain stroke.
  • Inverter board failure Drive electronics intermittent.
  • Main control board issue If a fresh inverter and compressor don't clear it.
  • Open compressor winding Internal compressor electrical failure.

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.

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 motor feedback fault Er CO Er CO — Communication error (main board ↔ display) Er dH Er dH — Defrost cycle exceeded time limit

All LG codes → All refrigerator codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.