LG double-oven range
showing F4
On LG double-oven ranges, F4 and F5 are the lower oven's thermistor errors.
Mon–Sat, 8am–8pm
- Temperature sensor
- Temperature sensor and thermostat repair
- Source: LG
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What F4
actually means.
On LG double-oven ranges, F4 and F5 are the lower oven's thermistor errors. The upper oven may keep working while the lower one refuses to heat.
LG range display · also shown as F5
What to do when F4 shows on the rangeKind of codeTemperature sensor
The oven sensor sent a reading the control would not accept, or one that climbed well past the setting. A loose plug or a sensor that has drifted is ruled out before the control board, and a temperature that keeps rising means the range is switched off at the breaker first.
Usually leads toTemperature sensor and thermostat repair
A range oven that bakes hot, bakes slow, takes forever to preheat or posts a sensor code, traced to the sensor probe, the thermostat or the calibration.
Shows up asRange Oven Not Heating
The burners or elements on top work, but the oven below stays cold, heats only a little, or never finishes preheating.
MakeLG
A Korean electronics group selling freestanding and slide-in ranges on gas, electric and induction, many with Wi-Fi.
SourceLG Help Library "LG Range - Error Codes List" (Wayback copy, 23 Jun 2025)
LG's list gives F4 to one oven of a double-oven range such as the LTGL6937F; on a single-oven range it is the only oven.
Before you book,
in this order.
Each step comes from LG's own guidance for F4 on its ranges. Follow it to the end: the last card says whether this is a visit.
Press CLEAR/OFF and try the lower oven again.
If F4 shows again, cut power at the breaker for 30 seconds.
Book a visit if F4 or F5 keeps coming back.
Still there?
It usually turns into temperature sensor and thermostat repair. Book with the code and the model number.
What not to do
F4 is not the upper oven sensor; that is F1 or F2.
What you may
notice with it.
The range problems F4 tends to arrive with. Answer these at the range before anyone is booked.
All problems
Range Oven Not Heating
7 causes, cheapest first
Where F4 usually leads
Temperature sensor and thermostat repair.
LG
ranges.
A Korean electronics group selling freestanding and slide-in ranges on gas, electric and induction, many with Wi-Fi.
LG range repair
Gas range
Open flames on top and a gas-fired oven below, all fed by one supply line behind the range and lit by igniters rather than a match.
Electric range
Coil elements or radiant elements under a smooth glass top, with an electric oven below, all running on a dedicated 240-volt circuit.
Dual-fuel range
Gas burners on top and an electric oven below, the combination most professional-style ranges use, needing both a gas line and a 240-volt circuit.
In LG's own words
F4 indicates a Lower Oven Thermistor Error.
Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. LG's list gives F4 to one oven of a double-oven range such as the LTGL6937F; on a single-oven range it is the only oven.
LG F4 range repair,
where we come out.
The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered.
All service areasTampa BayFL · 31 areas
Miami / South FloridaFL · 47 areas
New York MetroNY · 75 areas
HoustonTX · 36 areas
ChicagoIL · 50 areas
Los AngelesCA · 95 areas
San DiegoCA · 31 areas
Questions
about F4.
Can I clear F4 myself?
Can I use the upper oven on my LG while the lower one shows F4?
Is F5 more serious than F4 on an LG range?
Back to your everyday
Still showing F4?
Book with the code exactly as it appears, the full model number, and whether you notice any smell of gas or scorching — with a code, that is where the diagnosis begins.