- Appliances
- Refrigerators
Er FS
LG Er FS on a refrigerator: freezer temperature sensor fault
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
LG says FS points to a freezer temperature sensor fault, which reduces the appliance's performance. Unplug it for about 5 minutes and plug it back in; if FS stays, stop using it as before, watch the food and ask for a technician.
Safety first
Stop and check this first
- LG asks you not to disassemble or replace internal parts: the sensor and its wiring are connected to the board. If FS persists, stop using the fridge and call LG support.
Safe checks you can perform
- 5 minute reset
- Food temperature
- Details for LG support
Leave these tasks to a qualified professional
- Do not attempt this professional task: Freezer sensor measurement
- Do not attempt this professional task: Temperature test
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Freezer sensor measurement
What they doThe LG technician unplugs the fridge and measures the sensor and its wire with a multimeter against the model's specification.
They must show youthe measured value against the specified one.
In writingthe result and the replaced part, with its reference and reason.
Temperature test
What they doAfter the repair, the technician checks that the freezer reaches its temperature and FS does not return.
They must show youthe freezer reading after the test.
In writingthe result.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
5 minute reset
No special tools
Procedure
- Who:
- you.
- How:
- unplug the fridge, wait about 5 minutes and plug it back in, as LG instructs.
- Result that matters:
- FS does not return.
- If it does not return:
- note the date and keep an eye on the freezer.
- If it stays:
- LG asks you to contact support and stop using the appliance.
- Evidence to keep:
- a photo of the code and the date of the reset.
Evidence: How to Troubleshoot the Error Codes on Your LG Refrigerator
- 2
Food temperature
No special tools
Procedure
- Who:
- you.
- How:
- put an appliance thermometer in the fridge and another in the freezer, and keep the doors closed while the sensor is in doubt, because the control does not know how much to cool.
- Result that matters:
- the CDC sets 40 °F (about 4 °C) or below in the fridge and 0 °F (about -18 °C) or below in the freezer.
- If the readings are within range:
- the food is still protected; check the thermometers again every few hours.
- If the fridge is above 40 °F:
- with the door closed, the CDC gives the fridge 4 hours at most and a full freezer 48 hours (24 if half full). Frozen food that still has ice crystals or is at 40 °F or below can be refrozen. When in doubt, throw it out without tasting it.
- Evidence to keep:
- a photo of each thermometer with the time and a list of what you threw away.
Evidence: Keep Food Safe After a Disaster or Emergency
- 3
Details for LG support
No special tools
Procedure
- Who:
- you.
- How:
- note the model, serial number, the code and the thermometer readings in the freezer.
- Result that matters:
- the technician knows whether the freezer is over or under cooling.
- If the freezer is very cold or warm:
- say so; it guides the diagnosis.
- If the temperature is normal:
- say so too; the fault may be in the reading only.
- Evidence to keep:
- a list with readings and dates.
Evidence: [LG Refrigerator] Digital and Analog Error Codes · How to Troubleshoot the Error Codes on Your LG Refrigerator
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- LG
- Product type
- Refrigerators
Known code variants
- E FS
- ER FS
- Er(E) FS
- Error FS LG
- FS
- FS congelador LG
- LG freezer sensor FS
- LG FS error
What it means
LG defines FS as a freezer temperature sensor fault and warns it reduces the appliance's performance: without a reliable reading, the control does not know how much to cool the freezer. Its general guide for this code group asks you to unplug for about 5 minutes and plug back in; if the error persists, contact LG support, do not disassemble or replace internal parts and stop using the fridge. LG puts these codes down to a faulty component, a control circuit or a disconnected wire, and the code does not say which.
Warnings and stop conditions
- Mediumsource verified
LG asks you not to disassemble or replace internal parts: the sensor and its wiring are connected to the board. If FS persists, stop using the fridge and call LG support.
Evidence: How to Troubleshoot the Error Codes on Your LG Refrigerator
Symptoms and causes
Probable causes · in order
- Failed freezer sensorCommon
This is what LG lists for FS. The technician confirms it by measuring the sensor against the specification, not from the code.
Evidence: [LG Refrigerator] Digital and Analog Error Codes
- Disconnected wire or control circuit faultPossible
LG lists these causes for its system code group. They can only be told apart from the sensor by the technician's check.
Evidence: How to Troubleshoot the Error Codes on Your LG Refrigerator
Virtual technician
Does Er FS still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
[LG Refrigerator] Digital and Analog Error Codes
LG Electronics · 2025 · official_doc
- 2
How to Troubleshoot the Error Codes on Your LG Refrigerator
LG Electronics · 2026 · official_doc
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