--- title: "CellarCool E10: the controller's clock battery needs replacing" description: "What E10 means on CellarCool E10: the controller's clock battery needs replacings, what to check before booking, and when it is not a failure at all." url: "https://winecellarrepair.center/error-codes/cellarcool-e10/" --- # CellarCool E10: the controller's clock battery needs replacing E10 is CellarCool's notice that the clock battery on the digital controller is dead. ## What E10 actually means. E10 is CellarCool's notice that the clock battery on the digital controller is dead. The manual is explicit that this does not affect how the unit operates. It is a maintenance item, not a reason to worry about the wine. CellarCool wine cellar cooling unit display What to do when E10 shows on the wine cellar cooling unit ### Kind of code Power and controller The unit saw its supply dip, surge or drop out, or the controller has lost contact with the board it drives. The cause is as often a shared circuit, a tripped GFCI outlet, a loose connection or a storm outage as the unit itself. A breaker that will not stay on or a scorched smell means switching the circuit off at the panel, standing dry and away from the unit, and keeping the cellar door closed until the technician arrives. ### Usually leads to Wine cellar cooling diagnostic visit A visit that reads the cellar, the room the heat goes to and the cooling unit itself, and ends with one named cause, whether it is a part or the room. ### Shows up as Cellar Cooling Controller Display Blank A cellar cooling controller display blank shows nothing at all, flickers, shows half a number, or ignores its buttons, sometimes while the unit keeps cooling and sometimes while it stops. ### Make CellarCool Service for CellarCool systems when the wine room drifts warm, turns dry or the unit starts and stops every few minutes. ### Source CellarCool CM2500 (Ceiling Mount split) manual, version 4 (02/2022) CellarCool split, Ceiling Mount and fully ducted Ultimate controllers (CM2500, 3500-S/5000-S, Ultimate-R manuals). The CX through-the-wall series does not list this code. ## Before you book, in this order. Each step comes from CellarCool's own guidance for E10 on its wine cellar cooling units. Follow it to the end: the last card says whether this is a visit. 01 Check that the cellar reading is steady, as it should be. 02 Replace the clock battery following your manual, or ask for it at the next service visit. 03 Deal first with any other code showing alongside E10. ### Still there? It usually turns into [wine cellar cooling diagnostic visit](https://winecellarrepair.center/services/diagnostic-visit/). Book with the code and the model number. ### What not to do E10 is not a power or wiring problem, and it does not mean the controller is failing. Only the clock is affected. ## What you may notice with it. The wine cellar cooling unit problems E10 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 Controller Display Blank](https://winecellarrepair.center/problems/cellar-controller-display-blank/) [All 4 causes, cheapest first](https://winecellarrepair.center/problems/cellar-controller-display-blank/) It also comes with - [**Cellar Cooling Unit Error Code**](https://winecellarrepair.center/problems/cellar-cooling-unit-error-code/) Problem ### Cellar Cooling Controller Display Blank 4 causes, cheapest first Where E10 usually leads ## Wine cellar cooling diagnostic visit. Book a visit [What the job involves](https://winecellarrepair.center/services/diagnostic-visit/) ## CellarCool wine cellar cooling units. Service for CellarCool systems when the wine room drifts warm, turns dry or the unit starts and stops every few minutes. [CellarCool wine cellar cooling unit repair](https://winecellarrepair.center/brands/cellarcool/) More CellarCool codes [E1](https://winecellarrepair.center/error-codes/cellarcool-e1/) [E2](https://winecellarrepair.center/error-codes/cellarcool-e2/) [E7](https://winecellarrepair.center/error-codes/cellarcool-e7/) [EA](https://winecellarrepair.center/error-codes/cellarcool-ea/) [AH1](https://winecellarrepair.center/error-codes/cellarcool-ah1/) [AL1](https://winecellarrepair.center/error-codes/cellarcool-al1/) [Ad2](https://winecellarrepair.center/error-codes/cellarcool-ad2/) [dEF](https://winecellarrepair.center/error-codes/cellarcool-def/) Power and controller on other makes [WhisperKOOL E7](https://winecellarrepair.center/error-codes/whisperkool-e7/) [Wine Guardian !4](https://winecellarrepair.center/error-codes/wine-guardian-alarm-4/) [Wine-Mate CA](https://winecellarrepair.center/error-codes/wine-mate-ca/) [All 6 codes of this kind](https://winecellarrepair.center/error-codes/#family-power) CellarCool 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. CellarCool 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. CellarCool 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 CellarCool's own words > Clock battery is dead [CellarCool CM2500 (Ceiling Mount split) manual, version 4 (02/2022)](https://www.cellarcool.com/wp-content/uploads/2022/02/CC_CM2500_Manual_110V_022522.pdf) [CellarCool CM2500 (Ceiling Mount split) manual, version 4 (02/2022)](https://www.cellarcool.com/wp-content/uploads/2022/02/CC_CM2500_Manual_110V_022522.pdf) [CellarCool Ultimate Series (3300-R, 4400-R, 8800-R) owner's manual (01/2024)](https://www.cellarcool.com/wp-content/uploads/2024/10/CC-Ultimate-R-OM-012224-1.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. CellarCool split, Ceiling Mount and fully ducted Ultimate controllers (CM2500, 3500-S/5000-S, Ultimate-R manuals). The CX through-the-wall series does not list this code. ## CellarCool E10 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 that the cellar reading is steady, as it should be. If it comes back, it needs a visit. ### Is E10 on a CellarCool worth a service call? Not on its own. The unit cools normally; the battery can be changed whenever convenient. ### Why did E10 appear on my CellarCool after years of use? Clock batteries wear out with time, and E10 is simply the controller reporting it. ### Does a CellarCool CX show E10? No. The CX controller lists only E1, AH1 and AL1. --- **[Read on the site: CellarCool E10: the controller's clock battery needs replacing](https://winecellarrepair.center/error-codes/cellarcool-e10/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**