--- title: "CellarCool E2: the evaporator coil probe has lost its connection" description: "What E2 means on CellarCool E2: the evaporator coil probe has lost its connections, what to check before booking, and when it is not a failure at all." url: "https://winecellarrepair.center/error-codes/cellarcool-e2/" --- # CellarCool E2: the evaporator coil probe has lost its connection E2 on a CellarCool Ceiling Mount, split or Ultimate unit names the evaporator probe, plugged into the PB2 terminal of the circuit board. ## What E2 actually means. E2 on a CellarCool Ceiling Mount, split or Ultimate unit names the evaporator probe, plugged into the PB2 terminal of the circuit board. The controller uses it to start Anti-Frost cycles at about 26°F. Without it, frost can pile up on the coil unnoticed, and the first thing an owner sees may be weaker airflow or water under the unit. CellarCool wine cellar cooling unit display What to do when E2 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 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 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 E2 on its wine cellar cooling units. Follow it to the end: the last card says whether this is a visit. 01 Look at the evaporator coil for frost; if ice has formed, switch the unit off and let it melt, protecting racks and floor from the water. 02 Keep an eye on the cellar temperature, which the bottle probe still controls. 03 Book a visit to reseat or replace the evaporator probe inside the unit. ### 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 E2 is not the cellar temperature probe, so the setpoint still holds at first. The risk grows over days, as the coil ices without a defrost trigger. ## What you may notice with it. The wine cellar cooling unit problems E2 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 Leaking Water**](https://winecellarrepair.center/problems/cellar-unit-leaking-water/) - [**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 E2 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/) ## 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/) [E7](https://winecellarrepair.center/error-codes/cellarcool-e7/) [E10](https://winecellarrepair.center/error-codes/cellarcool-e10/) [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/) Sensors and probes on other makes [Breezaire Er](https://winecellarrepair.center/error-codes/breezaire-er/) [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 11 codes of this kind](https://winecellarrepair.center/error-codes/#family-sensor) 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 > Faulty evaporator probe connection [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 CM2500 (Ceiling Mount split) manual, version 4 (02/2022)](https://www.cellarcool.com/wp-content/uploads/2022/02/CC_CM2500_Manual_110V_022522.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 E2 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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Look at the evaporator coil for frost; if ice has formed, switch the unit off and let it melt, protecting racks and floor from the water. If it comes back, it needs a visit. ### Can CellarCool E2 lead to a water leak? It can. An evaporator that ices without defrosting eventually melts in one go, and the drain pan may not keep up. ### Does the CellarCool CX series show E2? No. The CX alarm table lists only E1, AH1 and AL1. ### Is replacing a CellarCool evaporator probe a big job? It is a small part, but it sits inside the unit on the circuit board terminal, so the unit has to be opened. --- **[Read on the site: CellarCool E2: the evaporator coil probe has lost its connection](https://winecellarrepair.center/error-codes/cellarcool-e2/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**