--- title: "Sub-Zero code 24: the defrost did not warm the coil enough" description: "What 24 means on Sub-Zero code 24: the defrost did not warm the coil enoughs, what to check before booking, and when it is not a failure at all." url: "https://freezerrepair.center/error-codes/sub-zero-24/" --- # Sub-Zero code 24: the defrost did not warm the coil enough Code 24 is Sub-Zero’s defrost underheat code on IC-27 columns and 700 Series models. ## What 24 actually means. Code 24 is Sub-Zero’s defrost underheat code on IC-27 columns and 700 Series models. The heater ran but the coil did not warm as it should, which can leave ice on the evaporator and slowly cut airflow. Sub-Zero freezer display What to do when 24 shows on the freezer ### Kind of code Defrost system A frost-free freezer warms its coil for a few minutes several times a day to melt the frost, and the control noticed that this did not happen or took too long. A heater that burned open, a defrost thermostat or a timer that stuck, or a drain frozen shut lets frost wrap the coil until air cannot pass. Chest freezers without automatic defrost do not show these codes; their frost comes off by hand. ### Usually leads to Freezer defrost system repair Repairing the heater, the defrost thermostat or sensor and the timer or board that keep ice off the hidden coil in a frost-free upright, column or undercounter freezer. ### Shows up as Freezer Error Code A freezer error code appears on the display: letters and digits, a flashing temperature, or a warning symbol, sometimes with an alarm and sometimes with the freezer still running. ### Make Sub-Zero Sub-Zero freezers repaired in the home, with the food kept shut in while the cause is found. ### Source Sub-Zero answer: 700 Series error code 24 700 Series and IC-27 integrated columns (shown as 24). ## Before you book, in this order. Each step comes from Sub-Zero's own guidance for 24 on its freezers. Follow it to the end: the last card says whether this is a visit. 01 Check the freezer temperature; if it is high, keep the door closed and book a visit. 02 If temperatures are close to normal, clean the condenser, then hold the door ajar alarm key for 15 seconds to clear 24 on a 700 Series. 03 Book a visit if 24, the Service light or rising temperatures come back. ### Still there? It usually turns into [freezer defrost system repair](https://freezerrepair.center/services/defrost-system-repair/). Book with the code and the model number. ### What not to do Code 24 is not the overheat code; that one is 21. It also does not mean the compressor has failed, although a frosted coil can make the freezer run longer. ## What you may notice with it. The freezer problems 24 tends to arrive with. Answer these at the freezer before anyone is booked. [All problems](https://freezerrepair.center/problems/) Before you call ### [Freezer Error Code](https://freezerrepair.center/problems/freezer-error-code/) [All 7 causes, cheapest first](https://freezerrepair.center/problems/freezer-error-code/) It also comes with - [**Heavy Frost Buildup in the Freezer**](https://freezerrepair.center/problems/freezer-frost-buildup/) - [**Standalone Freezer Not Freezing**](https://freezerrepair.center/problems/freezer-not-freezing/) - [**Freezer Runs All the Time**](https://freezerrepair.center/problems/freezer-running-constantly/) Problem ### Freezer Error Code 7 causes, cheapest first Where 24 usually leads ## Freezer defrost system repair. **Defrost heater, defrost thermostat or timer · low to moderate.** Book a visit [What the job involves](https://freezerrepair.center/services/defrost-system-repair/) ## Sub-Zero freezers. Sub-Zero freezers repaired in the home, with the food kept shut in while the cause is found. [Sub-Zero freezer repair](https://freezerrepair.center/brands/sub-zero/) More Sub-Zero codes [EC07](https://freezerrepair.center/error-codes/sub-zero-ec07/) [EC08](https://freezerrepair.center/error-codes/sub-zero-ec08/) [EC40](https://freezerrepair.center/error-codes/sub-zero-ec40/) [21](https://freezerrepair.center/error-codes/sub-zero-21/) [22](https://freezerrepair.center/error-codes/sub-zero-22/) [20 4 50](https://freezerrepair.center/error-codes/sub-zero-20-4-50/) [95 1 00](https://freezerrepair.center/error-codes/sub-zero-95-1-00/) [35 C 00](https://freezerrepair.center/error-codes/sub-zero-35-c-00/) [90 5 80](https://freezerrepair.center/error-codes/sub-zero-90-5-80/) Defrost system on other makes [Fisher & Paykel F2](https://freezerrepair.center/error-codes/fisher-and-paykel-f2/) [Marvel Ed](https://freezerrepair.center/error-codes/marvel-ed/) [Perlick TEL](https://freezerrepair.center/error-codes/perlick-tel/) [All 6 codes of this kind](https://freezerrepair.center/error-codes/#family-defrost) Sub-Zero builds this ### Freezer column A built-in, full-height freezer that stands alone in the cabinetry, often beside a matching fresh-food column, with a stainless or panel-ready door and an electronic control. Sub-Zero builds this ### Undercounter freezer A 15- to 24-inch freezer or a pair of freezer drawers built in under a counter, in a kitchen island, a home bar, a basement or a pool house, venting from the front. ## In Sub-Zero's own words > Defrost underheat [Sub-Zero answer: 700 Series error code 24](https://www.subzero-wolf.com/assistance/answers/sub-zero/700-series/700-series-error-code-24) [Sub-Zero answer: 700 Series error code 24](https://www.subzero-wolf.com/assistance/answers/sub-zero/700-series/700-series-error-code-24) [Sub-Zero answer: IC-27 integrated columns error code 24](https://www.subzero-wolf.com/assistance/answers/sub-zero/ic-27-integrated-columns/ic-27-integrated-columns-series-error-code-24) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. 700 Series and IC-27 integrated columns (shown as 24). ## Sub-Zero 24 freezer 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 areas](https://freezerrepair.center/locations/) [Tampa Bay](https://freezerrepair.center/locations/tampa-bay/) FL · 31 areas - [Hyde Park](https://freezerrepair.center/locations/tampa-bay/hyde-park/) - [Davis Islands](https://freezerrepair.center/locations/tampa-bay/davis-islands/) - [Palma Ceia](https://freezerrepair.center/locations/tampa-bay/palma-ceia/) - [Westchase](https://freezerrepair.center/locations/tampa-bay/westchase/) - [Carrollwood](https://freezerrepair.center/locations/tampa-bay/carrollwood/) - [Belleair](https://freezerrepair.center/locations/tampa-bay/belleair/) - [St. Pete Beach](https://freezerrepair.center/locations/tampa-bay/st-pete-beach/) - [Palm Harbor](https://freezerrepair.center/locations/tampa-bay/palm-harbor/) [Orlando](https://freezerrepair.center/locations/orlando/) FL · 30 areas - [Winter Park](https://freezerrepair.center/locations/orlando/winter-park/) - [Windermere](https://freezerrepair.center/locations/orlando/windermere/) - [Dr. Phillips](https://freezerrepair.center/locations/orlando/dr-phillips/) - [Bay Hill](https://freezerrepair.center/locations/orlando/bay-hill/) - [Lake Nona](https://freezerrepair.center/locations/orlando/lake-nona/) - [Heathrow](https://freezerrepair.center/locations/orlando/heathrow/) - [Celebration](https://freezerrepair.center/locations/orlando/celebration/) [Miami / South Florida](https://freezerrepair.center/locations/south-florida/) FL · 47 areas - [Brickell](https://freezerrepair.center/locations/south-florida/brickell/) - [Coconut Grove](https://freezerrepair.center/locations/south-florida/coconut-grove/) - [Coral Gables](https://freezerrepair.center/locations/south-florida/coral-gables/) - [Pinecrest](https://freezerrepair.center/locations/south-florida/pinecrest/) - [Key Biscayne](https://freezerrepair.center/locations/south-florida/key-biscayne/) - [Aventura](https://freezerrepair.center/locations/south-florida/aventura/) - [Sunny Isles Beach](https://freezerrepair.center/locations/south-florida/sunny-isles-beach/) - [Bal Harbour](https://freezerrepair.center/locations/south-florida/bal-harbour/) - [Miami Beach](https://freezerrepair.center/locations/south-florida/miami-beach/) - [Golden Beach](https://freezerrepair.center/locations/south-florida/golden-beach/) - [Weston](https://freezerrepair.center/locations/south-florida/weston/) - [Boca Raton](https://freezerrepair.center/locations/south-florida/boca-raton/) - [Palm Beach](https://freezerrepair.center/locations/south-florida/palm-beach/) [New York Metro](https://freezerrepair.center/locations/new-york/) NY · 75 areas - [Upper East Side](https://freezerrepair.center/locations/new-york/upper-east-side/) - [Upper West Side](https://freezerrepair.center/locations/new-york/upper-west-side/) - [Tribeca](https://freezerrepair.center/locations/new-york/tribeca/) - [SoHo](https://freezerrepair.center/locations/new-york/soho/) - [Greenwich Village](https://freezerrepair.center/locations/new-york/greenwich-village/) - [Battery Park City](https://freezerrepair.center/locations/new-york/battery-park-city/) - [Brooklyn Heights](https://freezerrepair.center/locations/new-york/brooklyn-heights/) - [Park Slope](https://freezerrepair.center/locations/new-york/park-slope/) - [DUMBO](https://freezerrepair.center/locations/new-york/dumbo/) - [Forest Hills](https://freezerrepair.center/locations/new-york/forest-hills/) - [Great Neck](https://freezerrepair.center/locations/new-york/great-neck/) - [Southampton](https://freezerrepair.center/locations/new-york/southampton/) - [Scarsdale](https://freezerrepair.center/locations/new-york/scarsdale/) [Houston](https://freezerrepair.center/locations/houston/) TX · 36 areas - [River Oaks](https://freezerrepair.center/locations/houston/river-oaks/) - [Memorial](https://freezerrepair.center/locations/houston/memorial/) - [Tanglewood](https://freezerrepair.center/locations/houston/tanglewood/) - [Greater Heights](https://freezerrepair.center/locations/houston/greater-heights/) - [Kingwood](https://freezerrepair.center/locations/houston/kingwood/) - [Bellaire](https://freezerrepair.center/locations/houston/bellaire/) - [Bunker Hill Village](https://freezerrepair.center/locations/houston/bunker-hill-village/) - [Piney Point Village](https://freezerrepair.center/locations/houston/piney-point-village/) - [Hunters Creek Village](https://freezerrepair.center/locations/houston/hunters-creek-village/) - [Sugar Land](https://freezerrepair.center/locations/houston/sugar-land/) - [Cinco Ranch](https://freezerrepair.center/locations/houston/cinco-ranch/) - [The Woodlands](https://freezerrepair.center/locations/houston/the-woodlands/) - [West University](https://freezerrepair.center/locations/houston/west-university/) [Chicago](https://freezerrepair.center/locations/chicagoland/) IL · 50 areas - [Lincoln Park](https://freezerrepair.center/locations/chicagoland/lincoln-park/) - [Near North Side](https://freezerrepair.center/locations/chicagoland/near-north-side/) - [West Loop / Near West Side](https://freezerrepair.center/locations/chicagoland/west-loop-near-west-side/) - [Wilmette](https://freezerrepair.center/locations/chicagoland/wilmette/) - [Winnetka](https://freezerrepair.center/locations/chicagoland/winnetka/) - [Glencoe](https://freezerrepair.center/locations/chicagoland/glencoe/) - [River Forest](https://freezerrepair.center/locations/chicagoland/river-forest/) - [Oak Park](https://freezerrepair.center/locations/chicagoland/oak-park/) - [Hinsdale](https://freezerrepair.center/locations/chicagoland/hinsdale/) - [Lake Forest](https://freezerrepair.center/locations/chicagoland/lake-forest/) - [Highland Park](https://freezerrepair.center/locations/chicagoland/highland-park/) - [Gold Coast](https://freezerrepair.center/locations/chicagoland/gold-coast/) - [Lakeview](https://freezerrepair.center/locations/chicagoland/lakeview/) [Los Angeles](https://freezerrepair.center/locations/los-angeles/) CA · 95 areas - [Beverly Hills](https://freezerrepair.center/locations/los-angeles/beverly-hills/) - [Bel Air](https://freezerrepair.center/locations/los-angeles/bel-air/) - [Holmby Hills](https://freezerrepair.center/locations/los-angeles/holmby-hills/) - [Brentwood](https://freezerrepair.center/locations/los-angeles/brentwood/) - [Pacific Palisades](https://freezerrepair.center/locations/los-angeles/pacific-palisades/) - [Santa Monica](https://freezerrepair.center/locations/los-angeles/santa-monica/) - [Hancock Park](https://freezerrepair.center/locations/los-angeles/hancock-park/) - [Studio City](https://freezerrepair.center/locations/los-angeles/studio-city/) - [Calabasas](https://freezerrepair.center/locations/los-angeles/calabasas/) - [Manhattan Beach](https://freezerrepair.center/locations/los-angeles/manhattan-beach/) - [Palos Verdes Estates](https://freezerrepair.center/locations/los-angeles/palos-verdes-estates/) - [Pasadena](https://freezerrepair.center/locations/los-angeles/pasadena/) - [San Marino](https://freezerrepair.center/locations/los-angeles/san-marino/) - [Malibu](https://freezerrepair.center/locations/los-angeles/malibu/) [San Diego](https://freezerrepair.center/locations/san-diego/) CA · 31 areas - [La Jolla](https://freezerrepair.center/locations/san-diego/la-jolla/) - [Carmel Valley](https://freezerrepair.center/locations/san-diego/carmel-valley/) - [Point Loma](https://freezerrepair.center/locations/san-diego/point-loma/) - [Del Mar](https://freezerrepair.center/locations/san-diego/del-mar/) - [Rancho Santa Fe](https://freezerrepair.center/locations/san-diego/rancho-santa-fe/) - [Coronado](https://freezerrepair.center/locations/san-diego/coronado/) - [Encinitas](https://freezerrepair.center/locations/san-diego/encinitas/) - [Solana Beach](https://freezerrepair.center/locations/san-diego/solana-beach/) [San Francisco Bay Area](https://freezerrepair.center/locations/bay-area/) CA · 74 areas - [Pacific Heights](https://freezerrepair.center/locations/bay-area/pacific-heights/) - [Presidio Heights](https://freezerrepair.center/locations/bay-area/presidio-heights/) - [Russian Hill](https://freezerrepair.center/locations/bay-area/russian-hill/) - [Noe Valley](https://freezerrepair.center/locations/bay-area/noe-valley/) - [Sea Cliff](https://freezerrepair.center/locations/bay-area/sea-cliff/) - [Hillsborough](https://freezerrepair.center/locations/bay-area/hillsborough/) - [Atherton](https://freezerrepair.center/locations/bay-area/atherton/) - [Woodside](https://freezerrepair.center/locations/bay-area/woodside/) - [Palo Alto](https://freezerrepair.center/locations/bay-area/palo-alto/) - [Los Altos Hills](https://freezerrepair.center/locations/bay-area/los-altos-hills/) - [Tiburon](https://freezerrepair.center/locations/bay-area/tiburon/) - [Piedmont](https://freezerrepair.center/locations/bay-area/piedmont/) - [Marina](https://freezerrepair.center/locations/bay-area/marina/) For the heart of your home. ## Questions about 24. ### Can I clear 24 myself? Check the freezer temperature; if it is high, keep the door closed and book a visit. If it comes back, it needs a visit. ### What does defrost underheat mean on a Sub-Zero freezer? The defrost heater was switched on, but the coil stayed colder than the control expected by the end of the cycle. A weak heater, a limit that opens early or ice packed around the coil can all cause it. ### Why does Sub-Zero ask me to clean the condenser for code 24? Its steps for the 700 Series start with the condenser when temperatures are near normal, since a clean condenser takes load off the system. If the code comes back after that, the defrost parts need testing. ### Could code 24 explain frost on the back wall of my Sub-Zero? Yes. When each defrost falls short, frost can build on the coil and spread to the panel in front of it. A technician can confirm by checking the heater and the coil. --- **[Read on the site: Sub-Zero code 24: the defrost did not warm the coil enough](https://freezerrepair.center/error-codes/sub-zero-24/)** **[Book a visit with FreezerRepair.center](https://freezerrepair.center/schedule/)**