Mode, not a failure
4 codes
Something the controller was told to do, not a part that wore out: a display switched between Fahrenheit and Celsius so 13 looks alarming, a set point or differential changed by someone leaning on the keys, a keypad lock that ignores every press, a standby state left on after a power cut, a reminder that service is due. The unit is fine, and the controller's own keys or its manual put it back.
- Usually leads to
- No repair — the setting is changed back
- Shows up as
- Wine Cellar Too WarmWine Cellar Too ColdCellar Cooling Controller Display BlankCellar Cooling Unit Error Code
Temperature and alarms
17 codes
The controller saw the cellar go past a high or low limit and raised an alarm, sometimes holding the worst reading it logged while the house was empty. The reason can be as small as the cellar door left ajar after a tasting or a long outage, a room gaining heat from new lights or a sunny glass wall, or as serious as cooling that has stopped. Keep the door shut and read a thermometer on a middle rack before touching anything; the alarm is a warning about the collection, not yet a diagnosis.
- Usually leads to
- Cellar cooling load and room check
- Shows up as
- Wine Cellar Too WarmWine Cellar Too ColdCellar Cooling Unit Running ConstantlyCellar Cooling Unit Error Code
The unit or its hygrometer reads the cellar's air as too dry for the corks or too damp for the labels and the walls. Cooling pulls water out of the air, so a unit that runs long in a leaky room tends to dry it out, while a gap in the vapor barrier, damp ground or a clogged drain can push it the other way. A humidifier or humidity kit, where one is fitted, is checked along with the door seal and the room before a sensor is blamed.
- Usually leads to
- Cellar humidity control repair
- Shows up as
- Wine Cellar Humidity Too LowWine Cellar Humidity Too High or MoldCondensation on Wine Cellar Walls or GlassCellar Cooling Unit Error Code
Sensors and probes
12 codes
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
- Shows up as
- Wine Cellar Too ColdCellar Cooling Unit Short CyclingCellar Cooling Unit Running ConstantlyCellar Cooling Unit Error Code
Coil icing and defrost
3 codes
The controller found the evaporator coil too cold for too long, or a defrost cycle that did not finish. Ice grows when warm, moist air keeps arriving and the coil cannot shed it: a set point pushed too low, a blocked return, a slow evaporator fan, a low refrigerant charge, or a door that lets the house in. When the ice melts all at once it can overwhelm the drain, so a leak often follows. Switching the unit off to thaw buys time; finding why it iced is the repair.
- Usually leads to
- Cellar coil icing and defrost repair
- Shows up as
- Cellar Cooling Evaporator Coil Icing UpCellar Cooling Unit Leaking WaterWine Cellar Too WarmCellar Cooling Unit Error Code
A fan the controller counts on is slow, noisy or stopped. On the cellar side one fan pushes cool air across the racks; on the exhaust side, or in a split system's outdoor condenser, another throws the room's heat away. A rack or a case of wine stacked against the grille, a clogged filter, a dust-caked condenser or a tired capacitor is cleared before a motor is replaced.
- Usually leads to
- Cellar evaporator and condenser fan repair
- Shows up as
- Cellar Cooling Unit Fan Not RunningCellar Cooling Unit Loud or VibratingCellar Cooling Unit Exhaust OverheatingCellar Cooling Unit Error Code
Compressor and pressure
1 code
The sealed system has stepped outside safe limits: a high-pressure switch opened because the heat had nowhere to go, a low-pressure switch opened because refrigerant is short, or the compressor would not start or kept tripping its own overload. Very often the cause is the exhaust side, a closet or garage too hot or too small for the unit, before it is the compressor. Handling refrigerant takes EPA Section 608 certification, and the unit's age weighs heavily on the decision.
- Usually leads to
- Cellar compressor and sealed system repair
- Shows up as
- Wine Cellar Too WarmCellar Cooling Unit Exhaust OverheatingCellar Cooling Unit Short CyclingCellar Cooling Unit Error Code
Power and controller
7 codes
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
- Shows up as
- Cellar Cooling Unit Not Turning OnCellar Cooling Unit Tripping the BreakerBurning Smell From a Cellar Cooling UnitCellar Cooling Controller Display BlankCellar Cooling Unit Error Code
