--- title: "Breezaire OH: the unit shut itself off because the cellar overheated" description: "What OH means on Breezaire OH: the unit shut itself off because the cellar overheateds, what to check before booking, and when it is not a failure at all." url: "https://winecellarrepair.center/error-codes/breezaire-oh/" --- # Breezaire OH: the unit shut itself off because the cellar overheated OH is the Sentry III's overheat protection. ## What OH actually means. OH is the Sentry III's overheat protection. When the storage temperature goes above 75°F after the first cooling cycle, the controller stops the unit, flashes OH in turn with the temperature and holds it off for at least 30 minutes. Breezaire ties it to blocked airflow at the warm side, which can make a unit heat the cellar instead of cooling it. Breezaire wine cellar cooling unit display What to do when OH shows on the wine cellar cooling unit ### Kind of code Temperature and alarms The controller saw the cellar go past a high or low limit and raised an alarm, sometimes holding the worst reading it logged while the house was empty. The reason can be as small as the cellar door left ajar after a tasting or a long outage, a room gaining heat from new lights or a sunny glass wall, or as serious as cooling that has stopped. Keep the door shut and read a thermometer on a middle rack before touching anything; the alarm is a warning about the collection, not yet a diagnosis. ### Usually leads to Cellar cooling load and room check Measuring the cellar as the cooling unit sees it: insulation, vapor barrier, door, glass and the heat load, to show whether the unit can ever keep up. ### Shows up as Cellar Cooling Unit Error Code A cellar cooling unit error code appears as letters or digits on the controller, a flashing reading, a blinking light on the unit, or an alarm tone, sometimes while the cellar still holds its temperature. ### Make Breezaire Visits to cellars cooled by a Breezaire unit, starting with a thermometer among the racks and a hand at the exhaust grille. ### Source Breezaire Sentry III Plus Controller owner's manual Sentry III and Sentry III Plus controllers on WKL through-the-wall units and WKSL split systems. Older WKS splits built before mid-2010 used a manual thermostat and show none of these codes. ## Before you book, in this order. Each step comes from Breezaire's own guidance for OH on its wine cellar cooling units. Follow it to the end: the last card says whether this is a visit. 01 Keep the cellar door shut, and move the most valuable bottles if the room is above about 70°F. 02 With the unit unplugged, clear anything within 3 feet of the exhaust grille and vacuum the condenser coil with a brush attachment. 03 After the 30-minute hold, restart with a manual reset by holding WARMER for at least 5 seconds; it only restarts below 75°F. 04 If OH returns, book a visit, since Breezaire's own advice for a repeat shutdown is to get help. ### Still there? It usually turns into [cellar cooling load and room check](https://winecellarrepair.center/services/cellar-cooling-load-and-room-check/). Book with the code and the model number. ### What not to do OH is not a sensor problem; the sensor is reading a cellar that really is hot. A broken sensor shows Er, and a reading beyond what the sensor can measure shows HI. ## What you may notice with it. The wine cellar cooling unit problems OH 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 Error Code](https://winecellarrepair.center/problems/cellar-cooling-unit-error-code/) [All 8 causes, cheapest first](https://winecellarrepair.center/problems/cellar-cooling-unit-error-code/) It also comes with - [**Wine Cellar Too Warm**](https://winecellarrepair.center/problems/cellar-too-warm/) - [**Cellar Cooling Unit Exhaust Overheating**](https://winecellarrepair.center/problems/cellar-unit-exhaust-overheating/) - [**Cellar Cooling Unit Fan Not Running**](https://winecellarrepair.center/problems/cellar-unit-fan-not-running/) Problem ### Cellar Cooling Unit Error Code 8 causes, cheapest first Where OH usually leads ## Cellar cooling load and room check. **Cooling load and room survey · lowest.** Book a visit [What the job involves](https://winecellarrepair.center/services/cellar-cooling-load-and-room-check/) ## Breezaire wine cellar cooling units. Visits to cellars cooled by a Breezaire unit, starting with a thermometer among the racks and a hand at the exhaust grille. [Breezaire wine cellar cooling unit repair](https://winecellarrepair.center/brands/breezaire/) More Breezaire codes [E1](https://winecellarrepair.center/error-codes/breezaire-e1/) [AL](https://winecellarrepair.center/error-codes/breezaire-al/) [Er](https://winecellarrepair.center/error-codes/breezaire-er/) [LO](https://winecellarrepair.center/error-codes/breezaire-lo/) [HI](https://winecellarrepair.center/error-codes/breezaire-hi/) Temperature and alarms on other makes [CellarCool AH1](https://winecellarrepair.center/error-codes/cellarcool-ah1/) [CellarPro HA](https://winecellarrepair.center/error-codes/cellarpro-ha/) [KoolR AL](https://winecellarrepair.center/error-codes/koolr-al/) [WhisperKOOL AH1](https://winecellarrepair.center/error-codes/whisperkool-ah1/) [Wine Guardian Flashing temperature with (!)](https://winecellarrepair.center/error-codes/wine-guardian-high-temperature-alarm/) [Wine-Mate HA](https://winecellarrepair.center/error-codes/wine-mate-ha/) [All 15 codes of this kind](https://winecellarrepair.center/error-codes/#family-temperature) Breezaire 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. Breezaire 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 Breezaire's own words > the unit will automatically shut off after 20 minutes, and the display will alternately flash “OH” and the temperature. [Breezaire Sentry III Plus Controller owner's manual](https://breezaire.com/wp-content/uploads/2023/06/SENTRY-III-Owners-Manual.pdf) [Breezaire Sentry III Plus Controller owner's manual](https://breezaire.com/wp-content/uploads/2023/06/SENTRY-III-Owners-Manual.pdf) [Breezaire product page (PDF)](https://breezaire.com/wp-content/uploads/2023/06/PRINT-Breezaire-Product-Page.pdf) [Breezaire WKL Series installation instructions](https://breezaire.com/wp-content/uploads/2025/02/WKL-Instruction-Jan-2025.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Sentry III and Sentry III Plus controllers on WKL through-the-wall units and WKSL split systems. Older WKS splits built before mid-2010 used a manual thermostat and show none of these codes. ## Breezaire OH 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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Keep the cellar door shut, and move the most valuable bottles if the room is above about 70°F. If it comes back, it needs a visit. ### What usually sets off OH on a Breezaire? Breezaire links the shutdown to a blocked condenser or a failed fan: a dusty coil, a closet or small room taking the exhaust, or something stacked against the warm grille. We check those before anything inside the sealed system. ### How long before a Breezaire restarts after OH? It stays off for at least 30 minutes. After that, a manual reset or unplugging and plugging it back in restarts it, but only if the cellar has fallen below 75°F. ### Why did my Breezaire show OH during a heat wave? Breezaire says output falls once the space around the cellar runs more than 25°F warmer than the cellar itself. A hot week in the room that takes the exhaust can push a borderline installation over the limit. --- **[Read on the site: Breezaire OH: the unit shut itself off because the cellar overheated](https://winecellarrepair.center/error-codes/breezaire-oh/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**