--- title: "WhisperKOOL COH: the condenser coil ran too hot" description: "What COH means on WhisperKOOL COH: the condenser coil ran too hots, what to check before booking, and when it is not a failure at all." url: "https://winecellarrepair.center/error-codes/whisperkool-coh/" --- # WhisperKOOL COH: the condenser coil ran too hot COH is the condenser overheat protection on SC PRO and Slimline LS through-wall units. ## What COH actually means. COH is the condenser overheat protection on SC PRO and Slimline LS through-wall units. When the condenser probe reaches 125°F, the controller shuts the compressor off, lights the red alarm and shows COH, and restarts normal operation once the coil falls to 115°F. The cause is almost always the hot side: a dirty condenser, intake air above 85°F or a condenser fan that has stopped. WhisperKOOL wine cellar cooling unit display · also shown as “COH” What to do when COH shows on the wine cellar cooling unit ### Kind of code Fans and airflow A fan the controller counts on is slow, noisy or stopped. On the cellar side one fan pushes cool air across the racks; on the exhaust side, or in a split system's outdoor condenser, another throws the room's heat away. A rack or a case of wine stacked against the grille, a clogged filter, a dust-caked condenser or a tired capacitor is cleared before a motor is replaced. ### Usually leads to Cellar evaporator and condenser fan repair Restoring the two fans a cellar unit depends on: the one that moves cellar air across the cold coil and the one that throws the heat away. ### Shows up as Cellar Cooling Unit Exhaust Overheating A cellar cooling unit exhaust overheating makes the room on the other side of the wall uncomfortably warm, blows hot air hard enough to feel from across the room, and often makes the unit stop and restart in the afternoon. ### 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 COH on its wine cellar cooling units. Follow it to the end: the last card says whether this is a visit. 01 Check the room behind the unit; WhisperKOOL wants the intake air no warmer than 85°F. 02 Clean dust from the condenser coil and filter on the exhaust side, with the unit unplugged. 03 Look to see that both condenser fans spin when the unit runs. 04 If COH returns on a cool day with a clean coil, book a visit. ### Still there? It usually turns into [cellar evaporator and condenser fan repair](https://winecellarrepair.center/services/cellar-evaporator-and-condenser-fan-repair/). Book with the code and the model number. ### What not to do COH does not mean the compressor has failed; the compressor is being stopped on purpose. Repeated COH does let the cellar warm, so the cause needs fixing. ## What you may notice with it. The wine cellar cooling unit problems COH 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 Unit Exhaust Overheating](https://winecellarrepair.center/problems/cellar-unit-exhaust-overheating/) [All 5 causes, cheapest first](https://winecellarrepair.center/problems/cellar-unit-exhaust-overheating/) It also comes with - [**Wine Cellar Too Warm**](https://winecellarrepair.center/problems/cellar-too-warm/) - [**Cellar Cooling Unit Fan Not Running**](https://winecellarrepair.center/problems/cellar-unit-fan-not-running/) - [**Cellar Cooling Unit Error Code**](https://winecellarrepair.center/problems/cellar-cooling-unit-error-code/) Problem ### Cellar Cooling Unit Exhaust Overheating 5 causes, cheapest first Where COH usually leads ## Cellar evaporator and condenser fan repair. **Evaporator or condenser fan motor, blade or capacitor · low to moderate.** Book a visit [What the job involves](https://winecellarrepair.center/services/cellar-evaporator-and-condenser-fan-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/) [Ad3](https://winecellarrepair.center/error-codes/whisperkool-ad3/) [dEF](https://winecellarrepair.center/error-codes/whisperkool-def/) Fans and airflow on other makes [CellarPro HA2](https://winecellarrepair.center/error-codes/cellarpro-ha2/) 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 > The condenser coil temperature is above 125°F [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 COH 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 room behind the unit; WhisperKOOL wants the intake air no warmer than 85°F. If it comes back, it needs a visit. ### Why does my WhisperKOOL SC PRO show COH only in summer? The room behind the unit gets hotter in summer. Once the intake air passes about 85°F, the condenser cannot shed heat fast enough. ### How many condenser fans does a WhisperKOOL SC PRO have? WhisperKOOL's COH checklist asks you to make sure both condenser fans are working, so a stopped fan is a common cause. ### Will COH damage my WhisperKOOL? COH is the unit protecting its compressor. Running with the cause unfixed means frequent stops and a warmer cellar. --- **[Read on the site: WhisperKOOL COH: the condenser coil ran too hot](https://winecellarrepair.center/error-codes/whisperkool-coh/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**