--- title: "Breezaire Er: the Sentry III has lost its temperature sensor" description: "What Er means on Breezaire Er: the Sentry III has lost its temperature sensors, what to check before booking, and when it is not a failure at all." url: "https://winecellarrepair.center/error-codes/breezaire-er/" --- # Breezaire Er: the Sentry III has lost its temperature sensor Er means the Sentry III can no longer trust the sensor it regulates from, the intake air sensor or a bottle probe if one is plugged in, so it stops cooling. ## What Er actually means. Er means the Sentry III can no longer trust the sensor it regulates from, the intake air sensor or a bottle probe if one is plugged in, so it stops cooling. Breezaire lets the owner run the unit by hand in the meantime: COOLER turns it on and WARMER turns it off, each with the 5-minute compressor delay. Breezaire wine cellar cooling unit display · also shown as ER What to do when Er shows on the wine cellar cooling unit ### Kind of code Sensors and probes The controller has lost a sensible reading from one of its probes: the one sampling the cellar air, the one on the evaporator coil, or on a remote probe the lead that runs out to a rack. With no number it can trust, the unit may chill the room well below 55°F, stop and start every few minutes, or run on without end. A probe unplugged during a rack install, pinched behind a board or sitting in a draft from the door is ruled out before a new one is ordered. ### Usually leads to Cellar controller and sensor repair Getting the controller, its display and its probes to read the cellar truthfully and call for cooling at the right time. ### 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 Er on its wine cellar cooling units. Follow it to the end: the last card says whether this is a visit. 01 If a bottle probe is fitted, check that its plug is fully seated, because the controller reads the probe in place of the air sensor. 02 To keep the cellar cool until the repair, press COOLER to start the unit by hand and WARMER to stop it, allowing for the 5-minute delay each time. 03 Watch the room on a separate thermometer while running by hand, since nothing is regulating the temperature. 04 Book a visit to test the sensor and its wiring. ### Still there? It usually turns into [cellar controller and sensor repair](https://winecellarrepair.center/services/cellar-controller-and-sensor-repair/). Book with the code and the model number. ### What not to do Er does not say the cellar is warm or cold; it says the controller cannot tell. LO and HI appear when the sensor still answers but reads below 32°F or above 99°F. ## What you may notice with it. The wine cellar cooling unit problems Er 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/) - [**Wine Cellar Too Cold**](https://winecellarrepair.center/problems/cellar-too-cold/) Problem ### Cellar Cooling Unit Error Code 8 causes, cheapest first Where Er usually leads ## Cellar controller and sensor repair. **Air or coil probe, display, transformer or control board · moderate.** Book a visit [What the job involves](https://winecellarrepair.center/services/cellar-controller-and-sensor-repair/) ## 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/) [OH](https://winecellarrepair.center/error-codes/breezaire-oh/) [LO](https://winecellarrepair.center/error-codes/breezaire-lo/) [HI](https://winecellarrepair.center/error-codes/breezaire-hi/) Sensors and probes on other makes [CellarCool E1](https://winecellarrepair.center/error-codes/cellarcool-e1/) [CellarPro P1](https://winecellarrepair.center/error-codes/cellarpro-p1/) [WhisperKOOL E1](https://winecellarrepair.center/error-codes/whisperkool-e1/) [Wine Guardian !3](https://winecellarrepair.center/error-codes/wine-guardian-alarm-3/) [Wine-Mate P1](https://winecellarrepair.center/error-codes/wine-mate-p1/) [All 10 codes of this kind](https://winecellarrepair.center/error-codes/#family-sensor) 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 > A faulty sensor will be indicated by a display of “Er”. [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 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 Er 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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If a bottle probe is fitted, check that its plug is fully seated, because the controller reads the probe in place of the air sensor. If it comes back, it needs a visit. ### Can I leave a Breezaire running by hand after Er? Only as a stopgap. In manual operation the controller is not switching the unit off at your setpoint, so check the temperature often and stop the unit with WARMER if the room gets too cold. ### Could a bottle probe be behind Er on my Breezaire? It is worth checking. Once a probe is plugged in, the Sentry III reads it instead of the intake air sensor, so the probe and its plug become the first suspects. ### Will a reset clear Er on a Breezaire? A manual reset, holding WARMER for at least 5 seconds, restarts the controller and keeps your settings. If the sensor itself has failed, Er comes straight back and the sensor or its connection has to be replaced. --- **[Read on the site: Breezaire Er: the Sentry III has lost its temperature sensor](https://winecellarrepair.center/error-codes/breezaire-er/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**