LG Freezer TS Error: Temperature sensor fault
LG freezer error — here’s what you need to know. The tS error code on your LG freezer indicates a temperature sensor fault. This is a High severity issue. What Does tS Mean on an LG Freezer? The tS code signals that the main temperature sensor (thermistor) responsible for monitoring the freezer cabinet temperature has […]
~45%
DIY Fixable
From 10
Typical Repair Cost
1–2 hours
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. The freezer cannot regulate temperature correctly without a functioning temperature sensor. Food safety is compromised and continued use risks compressor damage from uncontrolled run cycles
Can I reset the code?
Yes. A power cycle (unplug for 5 minutes) clears the fault code from memory. If the thermistor is genuinely defective the tS code will return during the board's startup self-test
When to stop immediately?
Stop if you notice: Freezer interior temperature rises above 10°F (-12°C) and food begins to thaw, Compressor runs non-stop and the condenser coils are extremely hot to the touch.
Symptoms You May Notice
Compressor runs continuously or not at all
Without a valid temperature reading, the control board either keeps the compressor on indefinitely or shuts it off entirely, depending on its failsafe logic
Freezer temperature fluctuates widely
Internal temperature swings far beyond the set point as the board cycles the compressor based on incorrect sensor data
tS code on the control panel display
The tS fault code is shown on the display, often alongside a temperature reading that appears frozen at one value or jumps erratically
Inconsistent temperature performance
The freezer runs too hot, too cold, or cycles erratically because the control board receives inaccurate temperature readings from the faulty sensor.
Possible Causes
Failed temperature thermistor
The thermistor element has aged past its rated tolerance, producing resistance values the board flags as out of specification
Requires ProfessionalDamaged sensor wiring
The thin sensor wire has been nicked by a shelf edge or punctured during manual defrosting, creating an open or intermittent circuit
DIY PossibleFrost encasing the sensor body
Heavy frost buildup surrounds the sensor, creating a thermal buffer that makes readings wildly inaccurate and triggers the fault
DIY PossibleSafe Checks You Can Do
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1
Manual defrost and sensor inspection
Unplug the freezer, remove all food, and allow it to defrost completely over 24 hours. Once clear of frost, inspect the sensor (usually a small probe clipped to the evaporator or cabinet wall) for ice coverage or visible wire damage
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2
Check the sensor wiring for visible damage
Trace the sensor wire from the probe to its harness connector. Look for kinks, cuts, or areas where insulation has worn through. Reseat the connector at both ends
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3
Power-cycle the unit
After defrosting and inspecting, plug the freezer back in. Wait 15 minutes for the board to complete its temperature sensor initialization and see if the tS code has cleared
When to Call a Professional
Contact a qualified technician if:
- Thermistor resistance is outside the rated range at room temperature — requires replacement
- Wiring shows cuts, burn marks, or bare conductors
- Code returns immediately after power cycle with no frost or visible sensor damage
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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