--- title: "CellarPro P3: the condenser probe has failed" description: "What P3 means on CellarPro P3: the condenser probe has faileds, what to check before booking, and when it is not a failure at all." url: "https://winecellarrepair.center/error-codes/cellarpro-p3/" --- # CellarPro P3: the condenser probe has failed P3 is CellarPro's condenser probe, the sensor behind the HA2 and LA2 alarms and behind the shutdown that stops the compressor when the condenser runs over 140°F (standard on VS units, optional on the 1800). ## What P3 actually means. P3 is CellarPro's condenser probe, the sensor behind the HA2 and LA2 alarms and behind the shutdown that stops the compressor when the condenser runs over 140°F (standard on VS units, optional on the 1800). When the probe fails, the panel flashes P3 and the unit loses those protections, though it keeps cooling the cellar on probe 1. CellarPro wine cellar cooling unit display What to do when P3 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 Exhaust Overheating A cellar cooling unit exhaust overheating makes the room on the other side of the wall uncomfortably warm, blows hot air hard enough to feel from across the room, and often makes the unit stop and restart in the afternoon. ### Make CellarPro CellarPro cooling units looked at in place, from a controller that has gone quiet to water where it should not be. ### Source CellarPro 1800 Series owner's manual CellarPro self-contained 1800 and VS units list it by name; the split and air-handler manuals name only P1. ## Before you book, in this order. Each step comes from CellarPro's own guidance for P3 on its wine cellar cooling units. Follow it to the end: the last card says whether this is a visit. 01 Confirm the cellar is holding its setpoint. 02 Keep the exhaust side clear and the room behind the unit as cool as you can, since the unit can no longer warn you about a hot condenser. 03 Book a visit to replace the condenser probe. ### 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 P3 does not mean the condenser is overheating; that would be HA2. It means the reading itself is missing. ## What you may notice with it. The wine cellar cooling unit problems P3 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 Exhaust Overheating](https://winecellarrepair.center/problems/cellar-unit-exhaust-overheating/) [All 5 causes, cheapest first](https://winecellarrepair.center/problems/cellar-unit-exhaust-overheating/) It also comes with - [**Cellar Cooling Unit Error Code**](https://winecellarrepair.center/problems/cellar-cooling-unit-error-code/) Problem ### Cellar Cooling Unit Exhaust Overheating 5 causes, cheapest first Where P3 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/) ## CellarPro wine cellar cooling units. CellarPro cooling units looked at in place, from a controller that has gone quiet to water where it should not be. [CellarPro wine cellar cooling unit repair](https://winecellarrepair.center/brands/cellarpro/) More CellarPro codes [P1](https://winecellarrepair.center/error-codes/cellarpro-p1/) [HA](https://winecellarrepair.center/error-codes/cellarpro-ha/) [HA2](https://winecellarrepair.center/error-codes/cellarpro-ha2/) [LA](https://winecellarrepair.center/error-codes/cellarpro-la/) [LA2](https://winecellarrepair.center/error-codes/cellarpro-la2/) Sensors and probes on other makes [Breezaire Er](https://winecellarrepair.center/error-codes/breezaire-er/) [CellarCool E1](https://winecellarrepair.center/error-codes/cellarcool-e1/) [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) CellarPro 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. CellarPro 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. CellarPro 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 CellarPro's own words > P1, P3 Probe Failure [CellarPro 1800 Series owner's manual](https://www.cellarprocoolingsystems.com/PDF%20Documents/Owners%20Manual%201800.pdf) [CellarPro 3200VS / 4200VS owner's manual](https://www.cellarprocoolingsystems.com/PDF%20Documents/Owners%20Manual%204200.pdf) [CellarPro 3200VS / 4200VS owner's manual](https://www.cellarprocoolingsystems.com/PDF%20Documents/Owners%20Manual%204200.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. CellarPro self-contained 1800 and VS units list it by name; the split and air-handler manuals name only P1. ## CellarPro P3 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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Confirm the cellar is holding its setpoint. If it comes back, it needs a visit. ### Is P3 on a CellarPro urgent? Not for the wine right away, since cooling continues. It removes the unit's view of its own condenser, so it should be fixed soon. ### Where is the P3 probe on a CellarPro? It measures the condenser coil at the rear of the unit, on the exhaust side. ### Can P3 cause HA2 on a CellarPro? A probe reading wrong could trigger false condenser alarms. A failed probe normally shows P3 instead. --- **[Read on the site: CellarPro P3: the condenser probe has failed](https://winecellarrepair.center/error-codes/cellarpro-p3/)** **[Book a visit with WineCellarRepair.center](https://winecellarrepair.center/schedule/)**