- Appliances
- Ovens
F1
LG F1 on an oven: upper oven thermistor error
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
On an LG range, F1 (and also F2) means a thermistor error, the temperature sensor of the upper oven. Press CLEAR/OFF; if it stays, cut the breaker for 30 seconds and, if it returns, book service.
Safety first
Stop and check this first
- With a sensor fault the oven does not regulate heat properly: do not leave it running unattended and use oven gloves, as the inside and the door can burn.
Safe checks you can perform
- CLEAR/OFF key and a 30 second cut
- Exact code and which oven
- What the oven does with the code
Leave these tasks to a qualified professional
- Do not attempt this professional task: Test cycle with controlled temperature
- Do not attempt this professional task: Thermistor measurement
What a technician must be able to justify
Technician visit
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.
Test cycle with controlled temperature
What they doAfter the repair, the technician runs a full bake and checks the oven regulates temperature with no code.
They must show youthe full cycle without F1.
In writingthe set temperature, the temperature reached and the result.
Thermistor measurement
What they doWith the range disconnected, the technician measures the upper oven thermistor with a multimeter and inspects its connector and wiring.
They must show youthe measured value against LG's specification and the state of the connector.
In writingthe measurement, any part replaced with its reference and the reason.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
CLEAR/OFF key and a 30 second cut
- Who:
- you, at the control panel and the breaker panel.
- How:
- press CLEAR/OFF and try the function again. If F1 returns, switch off the range's circuit breaker, wait 30 seconds and switch it back on, as LG advises.
- Result that matters:
- whether F1 returns after the cut.
- If it does not:
- it was a one-off; note when it happened.
- If it does:
- LG says the unit will require service.
- Evidence to keep:
- photo of the code and a note of each attempt.
Evidence: LG Range - Error Codes List
Exact code and which oven
- Who:
- you, no tools.
- How:
- note whether the display shows F1, F2 or F4. In LG's table, F1 and F2 belong to the upper oven and F4 to the lower one.
- Result that matters:
- knowing which oven has the warning.
- If it is F1 or F2:
- the warning is for the upper oven.
- If it is F4:
- it is the lower oven sensor; tell the technician.
- Evidence to keep:
- photo of the display with the code.
Evidence: LG Range - Error Codes List
What the oven does with the code
- Who:
- you, opening nothing but the door.
- How:
- notice whether the oven heats or stops when the code shows. Do not leave it running unattended while the code appears.
- Result that matters:
- what the oven does when F1 appears.
- If it stops at once:
- note the time; do not keep using it.
- If it overheats or heats unevenly:
- switch it off and do not use it until checked.
- Evidence to keep:
- note of what you saw and the time.
Evidence: LG Range - Error Codes List
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- LG
- Product type
- Ovens
Known code variants
- anomalía F1 secadora Miele
- Bosch cooktop F1 F6 work surface
- Bosch F1
- Bosch F6
- Bosch hob F6 overheated
- Bosch induction cooktop F1 error
- cocina LG F1 sonda
- DishDrawer F1
- DishDrawer flood fault
- error F1 DishDrawer
- error F1 placa inducción Bosch
- error F6 placa Bosch
- F 1
- F6
- Fisher & Paykel DishDrawer F1
- Fisher Paykel F1
- Gree F1
- Ideal boiler F1
- Ideal boiler F1 low pressure
- Ideal F01
- Ideal F1
- Ideal Logic F1
- lavavajillas Fisher & Paykel F1
- LG F-1 horno
- LG F1 horno
- LG F2 horno termistor
- LG oven F-1
- LG oven F2 thermistor
- LG range F1
- LG range F1 sensor
- Miele dryer F1
- Miele F1 fault tumble dryer
- Miele F1 secadora
- Miele heat pump dryer F1
- Neff F1 placa
- Neff F1 zona sobrecalentada
- Neff F1 zone overheated
- Neff F6 placa
- Neff hob F1
- Neff hob F1 F6
- Neff hob F6
- placa Bosch F1 proteger encimera
- placa Neff F1 F6
- secadora Miele F1 bomba de calor
What it means
LG defines F1 and F2 as an upper oven thermistor error. The thermistor is the sensor that tells the control the temperature inside; if its reading is not valid, the control cannot regulate the heat and warns. The fault can be in the sensor, its connection or wiring, or the control, and the code does not tell them apart. LG says to press CLEAR/OFF and, if it stays, cut the breaker for 30 seconds; if it persists, the unit needs service. The table is LG's US range error code list; check your model's manual to confirm the code means the same.
Warnings and stop conditions
- Mediumeditorial warning
With a sensor fault the oven does not regulate heat properly: do not leave it running unattended and use oven gloves, as the inside and the door can burn.
Evidence: LG Range - Error Codes List
Symptoms and causes
Probable causes · in order
- One-off invalid readingPossible
Fits if F1 clears after CLEAR/OFF or the power cut and does not return in later use.
Evidence: LG Range - Error Codes List
- Sensor or its connectionPossible
Fits if F1 returns every time after the power cut. The technician confirms it by measuring the sensor, not the code.
Evidence: LG Range - Error Codes List
- Oven controlLess common
If the sensor measures correctly and the code stays, the fault may be in the control; service checks it.
Evidence: LG Range - Error Codes List
Virtual technician
Does F1 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 · 2026 · official_doc
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