--- title: "Dishwasher error code F31" description: "LG dishwasher error code F31: This is one of three codes that share a symptom: the dishwasher washes perfectly and everything comes out wet." url: "https://lgmiami.support/error-codes/dishwasher-heat-dry-fan/" date_modified: "2026-09-05" Appliance type: "Dishwashers" --- # Dishwasher error code F31 ### What F31 means on this make This is one of three codes that share a symptom: the dishwasher washes perfectly and everything comes out wet. The heat dry system moves warm air through the tub at the end of the cycle, and the fan is what moves it. Losing it does not stop the machine cleaning and it does not need the appliance taken out of service — which is worth saying, because it is the group of codes most often mistaken for a machine that has failed. ### The other ways LG prints this one F31 · F 31 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 - Check whether the wash itself is still good. If it is, this is a drying problem only. - Make sure the rinse aid reservoir is not empty — it does much of the drying work. - Cycle the power at the breaker. - Book it when convenient. The machine is usable meanwhile. ### 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. Heat dry fan What this one means What F31 means on this make This is one of three codes that share a symptom: the dishwasher washes perfectly and everything comes out wet. The heat dry system moves warm air through the tub at the end of the cycle, and the fan is what moves it. Losing it does not stop the machine cleaning and it does not need the appliance taken out of service — which is worth saying, because it is the group of codes most often mistaken for a machine that has failed. The other ways LG prints this one F31 · F 31 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 Check whether the wash itself is still good. If it is, this is a drying problem only. Make sure the rinse aid reservoir is not empty — it does much of the drying work. Cycle the power at the breaker. Book it when convenient. The machine is usable meanwhile. 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: Dishwasher error code F31](https://lgmiami.support/error-codes/dishwasher-heat-dry-fan/)**