LG · Refrigerator Moderate

FS — Freezer sensor (thermistor) error

Freezer sensor (thermistor) error.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Typical cost
$15-35
Verified against
lg.com ↗

The fix

Freezer section thermistor

Freezer sensor (thermistor) error

$15-35 moderate difficulty 45 min Tools: screwdriver, multimeter

Diagnose first: Same family as the refrigerator thermistor; failure causes warm freezer or false defrost timing.

Find this part on Amazon →

As an Amazon Associate we earn from qualifying purchases.

How to fix it

  1. Same family as the refrigerator thermistor; failure causes warm freezer or false defrost timing.
  2. If diagnosis confirms the fault, replace the freezer section thermistor (typical cost $15-35, about 45 min, moderate DIY).

Why it happens

Typical signs: FS shown on the display · Freezer sensor (thermistor) error

  • Most likely: Freezer section thermistor Same family as the refrigerator thermistor; failure causes warm freezer or false defrost timing.

More LG refrigerator codes

22 22 — Compressor relay / inverter control fault 33 33 — Compressor / defrost test 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)

All LG codes → All refrigerator codes →

Frequently asked questions

What does the FS code mean on a LG refrigerator?

Freezer sensor (thermistor) error.

What causes the FS code on a LG refrigerator?

Most likely: Freezer section thermistor: Same family as the refrigerator thermistor; failure causes warm freezer or false defrost timing.

Is it safe to keep using a LG refrigerator with a FS error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix FS on a LG refrigerator?

Same family as the refrigerator thermistor; failure causes warm freezer or false defrost timing. If diagnosis confirms the fault, replace the freezer section thermistor (typical cost $15-35, about 45 min, moderate DIY).

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.