---
title: "Temperature sensor replacement"
description: "LG temperature sensor replacement: lG publishes four separate sensor codes on its refrigerators — FS for the freezer, rS for the fresh food side, dS for the…"
url: "https://lgmiami.support/services/temperature-sensor-replacement/"
date_modified: "2026-09-06"
Appliance type: "Freezers, Ice makers, Refrigerators, Wine coolers"
---


# LG temperature sensor replacement

### Measure it with a glass of water before you believe the display

The number on the door is what the cabinet thinks, and this is the repair where the cabinet is wrong. Put a glass of water in the fresh food compartment with a kitchen thermometer in it and leave it eight hours. That reading, not the panel, is the temperature your food has been living at. A gap of several degrees between the two, or a compartment that swings from icy lettuce to warm milk across a couple of days, is the pattern here. LG puts sensors in four different places and reports them separately, so the one that has drifted gets named rather than guessed at.

What this involves

Four sensors, four codes, four different locations

A cabinet with a bad sensor will happily freeze the fresh food side

Small part, contained job, and worth doing promptly

Read which sensor

FS, rS, dS or rT. On a two-evaporator cabinet the prefix says which coil as well.

Measure rather than assume

A thermistor is a resistance at a temperature. It is checked against the table, not replaced on suspicion.

Replace and route the harness properly

A sensor clipped where it touches metal reads the metal, which produces the same complaint again.

Reset and let it settle

The board relearns the compartment. Judging it in the first hour is judging a machine that is still catching up.

Verify with a probe

The display is not evidence. A thermometer on the middle shelf is.

### Everything freezes on the top shelf and the door bins are warm. One problem or two?

Usually one. A cabinet that cannot trust its own reading overshoots to be safe, so the coldest spot freezes while the door sits in the swing of it.

### Is a sensor worth replacing on a ten-year-old refrigerator?

Almost always. It is a small part behind a panel, and it is the least of the ways a cabinet of that age can go wrong.

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**[Read full article: Temperature sensor replacement](https://lgmiami.support/services/temperature-sensor-replacement/)**