Er FZ
LG Refrigerator
Severity: CriticalWhat Does This Error Mean?
The Er FZ error means the freezer compartment temperature sensor has failed or is out of range. The refrigerator cannot accurately monitor or control the freezer temperature. Frozen food is at risk if this is not repaired promptly.
Affected Models
- LRMVS3006S
- LRFXS2503S
- LFXS26973S
- LRMVS3006D
- Most LG French door and side-by-side refrigerators
Common Causes
- Freezer thermistor has failed — open or short circuit
- Wiring harness to the freezer sensor has come loose or been damaged
- Excessive frost around the sensor is causing false readings
- Main control board has stopped receiving the sensor signal
- Physical impact to the freezer interior damaged the sensor or its mount
How to Fix It
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Place a separate thermometer inside the freezer to check actual temperature.
If the temperature is above 0°F (-18°C), transfer frozen food to another freezer immediately.
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Unplug the refrigerator for 10 minutes, then restore power.
A full reset resets the sensor reading. If the error clears and temperatures stabilize, monitor for 24 hours.
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Inspect the freezer interior for excessive frost or ice buildup on the back wall.
Thick frost can encase and interfere with the temperature sensor.
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If frost is severe, manually defrost the freezer (leave unplugged with door open for 24 hours).
This may temporarily resolve the issue if frost was the cause.
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If the error persists, the thermistor or wiring harness needs professional testing and replacement.
This is a time-sensitive repair — do not delay if frozen food safety is at stake.
When to Call a Professional
A freezer sensor failure requires prompt repair to protect frozen food. Contact an LG certified technician as soon as possible. Expect repair costs of $100–$200 for sensor replacement and labor.
Frequently Asked Questions
What temperature should my LG freezer be at?
The recommended freezer temperature is 0°F (-18°C). Food kept above 10°F (-12°C) for extended periods is at risk. Above 32°F (0°C), food will begin to thaw — act immediately if you reach this temperature.
Can I confirm the freezer is safe without fixing Er FZ?
Yes — use an independent thermometer placed in the freezer. If temperatures read 0°F (-18°C) despite the error, the fridge may still be cooling correctly. However, without a functioning sensor, the fridge cannot regulate temperature properly over time. Arrange a repair regardless.
How long does a freezer thermistor last?
Most thermistors last 10–15 years under normal use. Exposure to temperature extremes, physical damage, or moisture intrusion can shorten their lifespan. Regular door seal checks help maintain proper conditions and extend component life.