--- title: "WhisperKOOL Ad3: the Anti-Frost cycle timed out on a through-wall unit" description: "What Ad3 means on WhisperKOOL Ad3: the Anti-Frost cycle timed out on a through-wall units, what to check before booking, and when it is not a failure at all." url: "https://winecellarrepair.center/error-codes/whisperkool-ad3/" --- # WhisperKOOL Ad3: the Anti-Frost cycle timed out on a through-wall unit Ad3 is the through-wall version of Ad2. ## What Ad3 actually means. Ad3 is the through-wall version of Ad2. On SC PRO and Slimline LS units, an Anti-Frost cycle stops the compressor for up to ten minutes; if the coil is still not above 26°F afterward, the red light comes on and Ad3 is logged. The unit then runs five minutes and starts another cycle, repeating until the coil warms. WhisperKOOL wine cellar cooling unit display · also shown as “Ad3” What to do when Ad3 shows on the wine cellar cooling unit ### Kind of code Coil icing and defrost The controller found the evaporator coil too cold for too long, or a defrost cycle that did not finish. Ice grows when warm, moist air keeps arriving and the coil cannot shed it: a set point pushed too low, a blocked return, a slow evaporator fan, a low refrigerant charge, or a door that lets the house in. When the ice melts all at once it can overwhelm the drain, so a leak often follows. Switching the unit off to thaw buys time; finding why it iced is the repair. ### Usually leads to Cellar coil icing and defrost repair Stopping ice from forming on the cellar coil by finding what starves it, whether airflow, charge, controls or humid air coming into the room. ### Shows up as Cellar Cooling Evaporator Coil Icing Up A cellar cooling coil icing up shows as white frost behind the cellar-side grille, weak air from the unit, water dripping when it goes quiet, and a room that warms while the unit keeps running. ### Make WhisperKOOL WhisperKOOL systems serviced where they are installed, whether the cellar is warming, the coil is frosting or the unit never rests. ### Source WhisperKOOL SC PRO Series owner's manual (12/2022) SC PRO and Slimline LS through-the-wall controllers. ## Before you book, in this order. Each step comes from WhisperKOOL's own guidance for Ad3 on its wine cellar cooling units. Follow it to the end: the last card says whether this is a visit. 01 Check the cellar-side coil for ice; unplug the unit and let it thaw before restarting. 02 Make sure the intake air on the cellar side is not below 60°F. 03 Clean the filter and clear anything blocking the grille. 04 If the unit keeps cycling into Anti-Frost about every five minutes, book a visit. ### Still there? It usually turns into [cellar coil icing and defrost repair](https://winecellarrepair.center/services/cellar-coil-icing-and-defrost-repair/). Book with the code and the model number. ### What not to do Ad3 does not appear on WhisperKOOL split or ducted units; they log Ad2 instead. A single defrost message without Ad3 is normal operation. ## What you may notice with it. The wine cellar cooling unit problems Ad3 tends to arrive with. Answer these at the wine cellar cooling unit before anyone is booked. [All problems](https://winecellarrepair.center/problems/) Before you call ### [Cellar Cooling Evaporator Coil Icing Up](https://winecellarrepair.center/problems/evaporator-coil-icing-up/) [All 5 causes, cheapest first](https://winecellarrepair.center/problems/evaporator-coil-icing-up/) It also comes with - [**Cellar Cooling Unit Short Cycling**](https://winecellarrepair.center/problems/cellar-unit-short-cycling/) - [**Cellar Cooling Unit Error Code**](https://winecellarrepair.center/problems/cellar-cooling-unit-error-code/) Problem ### Cellar Cooling Evaporator Coil Icing Up 5 causes, cheapest first Where Ad3 usually leads ## Cellar coil icing and defrost repair. **Thawing an iced coil and correcting its cause · low to moderate.** Book a visit [What the job involves](https://winecellarrepair.center/services/cellar-coil-icing-and-defrost-repair/) ## WhisperKOOL wine cellar cooling units. WhisperKOOL systems serviced where they are installed, whether the cellar is warming, the coil is frosting or the unit never rests. [WhisperKOOL wine cellar cooling unit repair](https://winecellarrepair.center/brands/whisperkool/) More WhisperKOOL codes [E1](https://winecellarrepair.center/error-codes/whisperkool-e1/) [E2](https://winecellarrepair.center/error-codes/whisperkool-e2/) [E3](https://winecellarrepair.center/error-codes/whisperkool-e3/) [E7](https://winecellarrepair.center/error-codes/whisperkool-e7/) [E10](https://winecellarrepair.center/error-codes/whisperkool-e10/) [EA](https://winecellarrepair.center/error-codes/whisperkool-ea/) [AH1](https://winecellarrepair.center/error-codes/whisperkool-ah1/) [AL1](https://winecellarrepair.center/error-codes/whisperkool-al1/) [Ad2](https://winecellarrepair.center/error-codes/whisperkool-ad2/) [COH](https://winecellarrepair.center/error-codes/whisperkool-coh/) [dEF](https://winecellarrepair.center/error-codes/whisperkool-def/) Coil icing and defrost on other makes [CellarCool Ad2](https://winecellarrepair.center/error-codes/cellarcool-ad2/) WhisperKOOL builds this ### Through-the-wall cellar cooling unit A self-contained box set into an opening in the cellar wall: its cold face blows into the wine room, and its warm face breathes out into the room next door. WhisperKOOL builds this ### Ducted cellar cooling unit A self-contained cooling unit placed outside the cellar, in a mechanical room, attic or basement, that sends chilled air in and takes return air back through insulated ducts. WhisperKOOL builds this ### Split-system cellar cooling An evaporator inside or beside the cellar and a condensing unit outside or in another room, joined by an insulated copper line set and charged on site. ## In WhisperKOOL's own words > Anti-Frost Cycle ended on time-out [WhisperKOOL SC PRO Series owner's manual (12/2022)](https://whisperkool.com/wp-content/uploads/2022/12/WK-SC-Series-OM-22-w-UV-120122.pdf) [WhisperKOOL SC PRO Series owner's manual (12/2022)](https://whisperkool.com/wp-content/uploads/2022/12/WK-SC-Series-OM-22-w-UV-120122.pdf) [WhisperKOOL SC PRO Series owner's manual (12/2022)](https://whisperkool.com/wp-content/uploads/2022/12/WK-SC-Series-OM-22-w-UV-120122.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. SC PRO and Slimline LS through-the-wall controllers. ## WhisperKOOL Ad3 wine cellar cooling unit 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. 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Check the cellar-side coil for ice; unplug the unit and let it thaw before restarting. If it comes back, it needs a visit. ### Why does my WhisperKOOL SC PRO stop and start every few minutes? Repeated Anti-Frost cycles do that: five minutes of running, then another defrost. With Ad3 logged, the coil is not warming enough between cycles. ### Can a cold cellar cause Ad3 on a WhisperKOOL? Yes. WhisperKOOL asks for intake air of at least 60°F; a cellar set very low can keep the coil frosting. ### Where do I see Ad3 on a WhisperKOOL SC PRO? The red alarm light shows in the corner of the display, and Ad3 is recorded in the alarm folder. --- **[Read on the site: WhisperKOOL Ad3: the Anti-Frost cycle timed out on a through-wall unit](https://winecellarrepair.center/error-codes/whisperkool-ad3/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**