--- title: "Cellar Cooling Unit Error Code: Causes and Fixes" description: "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…" url: "https://winecellarrepair.center/problems/cellar-cooling-unit-error-code/" --- # 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. ## What it usually means. A cellar cooling unit error code is the controller naming the check that failed. On a cellar system those checks watch the room temperature against its alarm limits, the humidity where the controller measures it, the probes in the room air and on the coil, the defrost that keeps the coil clear, the fans on both sides of the wall, the compressor and its pressure switches, and the supply voltage along with the controller's own health. Not every code is a failure: a standby, a panel lock, a defrost in progress or a service test can also appear as letters. Makers do not share a code language, so identical characters can point at a coil probe on one brand and at a high-temperature alarm on another; the model number is what decodes them. The code pages on this site group each maker's codes by those same families, which is the quickest place to begin. The 8 causes, cheapest first Answer these first 01 What exactly does the controller show, and could a letter be a digit, such as an S for a 5 or an O for a 0? 02 Does the code come with an alarm tone, a warm room, ice on the coil or nothing else? 03 Does the code come back after the unit has been off at the breaker for a few minutes? 04 Is the controller on the unit or on a separate wall panel? 05 Can you find the model and serial numbers on the unit's label? ## Check these before you book. Cellar cooling unit error code: 5 checks, and none of them costs anything. 01 Copy the code exactly as the controller shows it, noting anything that blinks and whether a tone sounds. 02 Check the room with a thermometer in a glass of water on a middle rack. 03 If the room is warming, keep the cellar door closed and carry the most valuable bottles to the coolest dark place in the house. ### Also worth checking - Find the code in the owner's manual, or in the cellar code pages here, using the make and the model number from the unit's label. - Turn the unit off at the breaker, standing at a dry panel, wait five minutes, and watch whether the same code comes back. ### How soon does it need a visit? A code by itself is rarely an emergency. It becomes one when it arrives with a warming room, with water close to an outlet or with a smell of burning: protect the collection or cut the power from a dry panel first, then book the visit. ## The causes, cheapest first. 8 things cellar cooling unit error code turns out to be, from standby, defrost or a test mode to temperature alarm. [The cost guide](https://winecellarrepair.center/cost/) 1. 01 no repair ### Standby, defrost or a test mode A defrost in progress, a standby or a locked panel can look like a code. The manual lists each one and how to end it. No repair: check it yourself 2. 02 low to moderate ### Room or coil sensor code A sensor or its cable reads open or shorted, and the controller stops trusting it. [Fixed by cellar controller and sensor repair](https://winecellarrepair.center/services/cellar-controller-and-sensor-repair/) 3. 03 low to moderate ### Coil icing or defrost code The controller saw the coil stay too cold for too long, or a defrost that did not finish. [Fixed by cellar coil icing and defrost repair](https://winecellarrepair.center/services/cellar-coil-icing-and-defrost-repair/) [See cellar cooling evaporator coil icing up](https://winecellarrepair.center/problems/evaporator-coil-icing-up/) 4. 04 low to moderate ### Humidity code On systems that read humidity, the room stayed outside its limits or the humidity sensor failed. [Fixed by cellar humidity control repair](https://winecellarrepair.center/services/cellar-humidity-control-repair/) [See wine cellar humidity too high or mold](https://winecellarrepair.center/problems/cellar-humidity-too-high-or-mold/) 5. 05 low to moderate ### Fan or airflow code A fan did not report turning, or the coil temperatures showed too little air moving. [Fixed by cellar evaporator and condenser fan repair](https://winecellarrepair.center/services/cellar-evaporator-and-condenser-fan-repair/) [See cellar cooling unit fan not running](https://winecellarrepair.center/problems/cellar-unit-fan-not-running/) 6. 06 moderate to highest ### Compressor or pressure code A pressure switch tripped, or the controller saw the room fail to cool while the compressor should have been running. [Fixed by cellar compressor and sealed system repair](https://winecellarrepair.center/services/cellar-compressor-and-sealed-system-repair/) 7. 07 moderate ### Power or controller code The controller saw low voltage, lost contact with its wall panel, or found an error in itself. [Fixed by cellar controller and sensor repair](https://winecellarrepair.center/services/cellar-controller-and-sensor-repair/) 8. 08 varies ### Temperature alarm The room crossed its alarm limit. Confirm it with a thermometer standing in water on a middle rack; if the reading agrees, deal with the bottles before anything else. [Book a diagnostic visit](https://winecellarrepair.center/services/diagnostic-visit/) [See wine cellar too warm](https://winecellarrepair.center/problems/cellar-too-warm/) 9. What it costs ### Every repair on the site's cost scale, side by side Open the cost guide ## What else it could be. Most often confused with cellar cooling controller display blank, then wine cellar too warm. [All problems](https://winecellarrepair.center/problems/) Codes that come with it - [`E1` Breezaire · Temperature and alarms](https://winecellarrepair.center/error-codes/breezaire-e1/) - [`AL` Breezaire · Temperature and alarms](https://winecellarrepair.center/error-codes/breezaire-al/) - [`OH` Breezaire · Temperature and alarms](https://winecellarrepair.center/error-codes/breezaire-oh/) - [`Er` Breezaire · Sensors and probes](https://winecellarrepair.center/error-codes/breezaire-er/) - [`LO` Breezaire · Sensors and probes](https://winecellarrepair.center/error-codes/breezaire-lo/) - [`HI` Breezaire · Sensors and probes](https://winecellarrepair.center/error-codes/breezaire-hi/) [45 more codes, by make](https://winecellarrepair.center/error-codes/) Also related - [**Cellar Cooling Unit Fan Not Running** 4 causes](https://winecellarrepair.center/problems/cellar-unit-fan-not-running/) ### Cellar Cooling Controller Display Blank 4 causes The collection is exposed ### Wine Cellar Too Warm 6 causes ### Cellar Cooling Evaporator Coil Icing Up 5 causes ## The makes it happens on. 7 makes on this site; cellar cooling unit error code can show up on any of them. Each mark opens that make's own page. [All 7 brands](https://winecellarrepair.center/brands/) ## Cellar Cooling Unit Error Code, where we come out. 9 metros, each with its own page. 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No. Some older and simpler units only flash a light or the temperature, while newer controllers print codes. Even a flashing light points to a family of causes once we know the model. ### If I switch the cellar unit off and on, is the code gone for good? A restart clears a code left by a momentary event, such as a brief dip in the supply. A code that reappears is pointing at a real part, and with the model number it tells us what to carry to the visit. ### The code points to a sensor. Can I replace it myself? On some models a room sensor simply plugs in, but a coil sensor sits among the fins and lines. A wrong or misplaced sensor causes new problems, so we usually test before replacing. ### Is a flashing temperature on the cellar controller an error? Most often it is an alarm rather than a code: the room has drifted from its setting, perhaps after the door stood open or a case of warm bottles was put away. If the blinking continues several hours after the door has stayed closed, handle it as a code. --- **[Read on the site: Cellar Cooling Unit Error Code: Causes and Fixes](https://winecellarrepair.center/problems/cellar-cooling-unit-error-code/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**