--- title: "Range error code F1" description: "LG range error code F1: An oven holds temperature by comparing what it wants against what its sensor reports, so a sensor that has drifted or opened leaves…" url: "https://lgmiami.support/error-codes/oven-upper-thermistor/" date_modified: "2026-09-05" Appliance type: "Ranges, Wall ovens" --- # Range error code F1 ### What F1 means on this make An oven holds temperature by comparing what it wants against what its sensor reports, so a sensor that has drifted or opened leaves it with nothing to aim at. LG stops the cavity rather than let it run open-loop, which is the right call — an oven with no measurement is an oven with no upper limit. On a double oven or a double wall oven, F1 and F2 are specifically the UPPER cavity, and that is the useful part of the code: the lower one has numbers of its own. ### The other ways LG prints this one F1 · F2 LG publishes a condition and then every string that can stand for it, and which one your machine shows depends on the panel it was built with — OE, E03 and E21 are one condition on a washer, and Er dS, F dS and r dS are one sensor on different evaporators. They are one page here, so whichever of them you searched for, this is the right page. ### Where this appears, and why not to clear it On the appliance’s own display. LG reports errors two ways: machines with a digital display show a code, and the laundry machines without one blink their indicator lights instead. Both are published by the maker and both are on this site. Photograph what the panel shows before cutting the power. On a refrigerator you can also force the last code back onto the display by holding Freezer Temperature and Express Frz together for three seconds — LG documents that, and it is the one thing that makes a first visit more useful. A code that has been reset is information a technician no longer has. ### What to do about it - Press the CLEAR/OFF key and try the function again. - If it comes straight back, switch the breaker for the range off for thirty seconds. - Note whether the other cavity still works — on a double oven it usually does, and that is worth telling the engineer. - Book it. The sensor is a probe in the cavity wall and it is a contained repair. ### Where this goes next The job this usually becomes is [diagnostic visit](/services/diagnostic-visit/), and that page carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes, reminders and settings rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 419-0291](tel:+13054190291) and describe what the panel is doing before booking anything. Upper oven thermistor What this one means What F1 means on this make An oven holds temperature by comparing what it wants against what its sensor reports, so a sensor that has drifted or opened leaves it with nothing to aim at. LG stops the cavity rather than let it run open-loop, which is the right call — an oven with no measurement is an oven with no upper limit. On a double oven or a double wall oven, F1 and F2 are specifically the UPPER cavity, and that is the useful part of the code: the lower one has numbers of its own. The other ways LG prints this one F1 · F2 LG publishes a condition and then every string that can stand for it, and which one your machine shows depends on the panel it was built with — OE, E03 and E21 are one condition on a washer, and Er dS, F dS and r dS are one sensor on different evaporators. They are one page here, so whichever of them you searched for, this is the right page. Where this appears, and why not to clear it On the appliance’s own display. LG reports errors two ways: machines with a digital display show a code, and the laundry machines without one blink their indicator lights instead. Both are published by the maker and both are on this site. Photograph what the panel shows before cutting the power. On a refrigerator you can also force the last code back onto the display by holding Freezer Temperature and Express Frz together for three seconds — LG documents that, and it is the one thing that makes a first visit more useful. A code that has been reset is information a technician no longer has. What to do about it Press the CLEAR/OFF key and try the function again. If it comes straight back, switch the breaker for the range off for thirty seconds. Note whether the other cavity still works — on a double oven it usually does, and that is worth telling the engineer. Book it. The sensor is a probe in the cavity wall and it is a contained repair. Where this goes next The job this usually becomes is diagnostic visit, and that page carries a starting figure and the reasons that move it. If it turns out to be nothing — and on this make a real share of these are modes, reminders and settings rather than problems — the visit ends there and you pay the diagnostic and nothing else, or call [(305) 419-0291](tel:+13054190291) and describe what the panel is doing before booking anything. --- **[Read full article: Range error code F1](https://lgmiami.support/error-codes/oven-upper-thermistor/)**