Step-by-Step DIY Fix Guide
- SAFETY: Unplug the refrigerator.
- Reset by unplugging for 5–10 minutes to allow the compressor to equalize pressure, then restore power.
- Listen for the compressor to start within 5 minutes of restoring power — it should produce a low hum from the back-bottom of the refrigerator.
- If 33 returns or the compressor does not start, call an LG-authorized technician immediately.
If the warning comes back after restart
- If the warning returns immediately after a clean restart, the sensor or wiring path becomes more likely than a one-time glitch.
- 33 returns after a 10-minute power reset
- Compressor does not produce a low running hum within 5 minutes of power restore
What This Error Means
Error 33 on your LG refrigerator means: The refrigerator has detected a fault with the compressor start relay or the compressor circuit. The compressor may not be starting or running correctly, putting the cooling system at risk. The refrigerator's self-diagnostic system has detected this condition.
The most frequent cause is start relay failure — the relay that kick-starts the compressor has failed. Work through the causes and fix steps below in order — many LG refrigerator errors are resolved without a service call.
LG's official guidance classifies 33 as a technician-only fault. A 5-minute power reset is the only DIY step — if the code returns, contact LG Support at 1-800-243-0000.
Compressor faults are among the most serious refrigerator errors. Move perishable food to a cooler immediately — a refrigerator without a running compressor will reach unsafe food temperatures within 4 hours. Do not delay calling a technician.
Most Likely Cause by Symptom
The LG refrigerator may stop, pause, or refuse to complete the cycle normally.
Likely cause: Start relay failure — the relay that kick-starts the compressor has failed
Check first: SAFETY: Unplug the refrigerator.
Common Causes
- Start relay failure — the relay that kick-starts the compressor has failed
- Compressor winding fault — motor winding is open or shorted
- Overload protector has tripped due to excessive heat or current draw
- Control board fault affecting the compressor output circuit
What Not to Do
- Do not ignore error 33 — a non-running compressor means no cooling and food will spoil within 4 hours
Model and Display Variation Notes
Model-family notes
- LG refrigerator display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Service option
LG service visit if the warning returns after the basic checks are complete.
Manual and model check
Check your exact model and manual before ordering any LG refrigerator parts.
Common parts
- Compressor start relay if relay has failed ($10–$40)
- Compressor (~$200–$500+) if motor winding has failed ()
- Main control board if board output circuit is faulty ($100–$250)
This section stays service-first because the page points more strongly toward support or professional repair than a routine parts purchase.
When Not to Keep Troubleshooting
33 returns after a 10-minute power reset
- Compressor does not produce a low running hum within 5 minutes of power restore
How to Prevent It Recurring
- Clean the condenser coils every 6 months — dirty coils cause the compressor to overheat and stress the start relay
- Ensure 2 inches of clearance on all sides of the refrigerator for adequate ventilation
Related Error Codes
22
The refrigerator has detected a fault with the compressor relay circuit. This is closely related to error 33 and indicates the same class of compressor start or run fault on certain LG model ranges.
CO
The main control board and one or more sub-boards (such as the display board or inverter board) cannot communicate. The refrigerator's internal electronics have lost contact with each other.
rF
LG refrigerator error rF usually means the refrigerator-section fan is not moving air correctly.
Extra notes
- This page is based on LG support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-08
Based on: Based on LG support material and edited into consumer-safe guidance for the exact code family on this page.
Model coverage note: LG refrigerator code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.