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A homeowner in a utility room beside a wine cellar, one hand held flat in front of the exhaust-side grille of a through-the-wall cooling unit set high in the wall, the cellar's solid wood door open behind showing racks of bottles.

Troubleshooting

Cellar cooling checks before booking: twenty minutes on both sides of the wall

Wine cellar cooling troubleshooting starts with readings an owner can take safely: a thermometer in a water-filled bottle on a middle rack, the air at both grilles, the exhaust room temperature, the breaker and outlet, the door seal and the drain outlet. Write down what you find, and the exact characters on the controller, before booking.

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(844) 398-5977

Mon–Sat, 8am–8pm

  • Checks an owner can make in the cellar
  • 5-minute read
  • Across every type and make

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Three short steps, about a minute.

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At a
glance.

Most wine cellar cooling troubleshooting can begin without touching the unit. Twenty minutes with a thermometer and a flashlight, on both sides of the wall, separates a room problem from a machine problem and gives the technician what they need if a visit is still due.

Read the whole guide

A bottle that reads like wineAn empty bottle about 75% full of water

WhisperKool's setup for its bottle probe; the same bottle suits any probe thermometer.

Wait before changing the thermostatAt least 3 days

Breezaire's advice after start-up before the thermostat is touched.

A pause that looks like a breakdownAbout 3 minutes

CellarPro and Breezaire controllers hold the compressor off after power returns.

Temperature alarms after a restartSilent for 23 hours

CellarPro disables its high and low alarms for that long after power-up.

Measure the wine, not the air

Air near a cellar unit swings several degrees with each cycle, and a quick reading at the doorway means little. Fill an empty wine bottle about three-quarters full of water, as WhisperKool describes for its bottle probe, push a thermometer probe into it and stand it on a middle rack out of the unit's airflow. Read it the next morning, before anyone opens the door.

Then compare it with the controller. Some displays show air at the unit's intake, some show a bottle probe, and a few show the set point until a key is pressed. WhisperKool reminds owners that the air in a cellar that is still cooling reads colder than the liquid, so a display that looks right on the first day can be several degrees ahead of the bottles.

Source: WhisperKool — SC Pro series owner's manual — Bottle probe in an empty bottle filled 75% with water; air in a cooling cellar reads colder than the liquid; do not use a GFI; a blinking snowflake marks the five-minute anti-short-cycle wait; a selector switch picks the front or rear power inlet; 55°F only with intake air at or below 85°F; a poorly sealed door makes the unit run continuously

Power, breaker and controller

A unit that is completely silent needs its power path checked first. Look at the panel for a tripped breaker and reset it a single time with dry hands and dry feet; a second trip means it stays off. Note whether the unit plugs into a GFCI outlet and read your own manual on that point, because the makers disagree: Breezaire asks for a GFCI outlet on its own circuit, while WhisperKool, CellarCool and Wine-Mate tell owners not to use one with their units at all.

If there is power and no cooling, wait before deciding anything. CellarPro and Breezaire controllers hold the compressor off for about three minutes after power returns, and WhisperKool's blinks its snowflake symbol through a five-minute rest between runs. A unit waiting out that delay looks broken to anyone standing beside it.

Nothing lit, nothing running

Start at the outlet by plugging in a lamp. On WhisperKool's SC units, check the selector switch on the side of the housing, which chooses between the front and rear power inlets; with the cord in the rear inlet and the switch set to front, the unit stays dark. On a split system the outdoor condenser often has its own breaker and a disconnect box beside it, and both have to be on.

Display on, compressor idle

Compare the set point with the reading. If the cellar already sits at or below the setting, the controller has nothing to do. Look for a mode indicator too: CellarPro's Energy Saver raises the set point by 4°F, and a lit defrost symbol on most controllers means the compressor is paused on purpose while the fan clears the coil.

Source: WhisperKool — SC Pro series owner's manual — Bottle probe in an empty bottle filled 75% with water; air in a cooling cellar reads colder than the liquid; do not use a GFI; a blinking snowflake marks the five-minute anti-short-cycle wait; a selector switch picks the front or rear power inlet; 55°F only with intake air at or below 85°F; a poorly sealed door makes the unit run continuously; Breezaire — WKL Series installation instructions — Plug into a GFCI outlet on its own circuit; about a three-minute restart delay after an outage; do not change the setting for 3 days after start-up; air leaving the cold side 6°F or more colder than it enters means the unit works; paper and dark-room tests for leaks; CellarPro — 1800 series owner's manual — 3-minute delay at startup; Energy Saver raises the minimum set point by 4°F; HA and LA alarms disabled for the first 23 hours after power-up; CellarCool — CX series owner's manual — Do not use a GFI with the unit; the cellar warms when the exhaust room exceeds 85°F; Wine-Mate (Vinotemp) — WM-1500/2500HTD owner's manual — Do not use a GFI; ambient temperature no higher than 78°F for the WM-1500HTD and 95°F for the WM-2500HTD

Close on the intake grille of a through-the-wall cellar cooling unit, a light film of dust on its slats.
Close on the intake grille of a through-the-wall cellar cooling unit, a light film of dust on its slats.

Both grilles, both rooms

With the unit running, hold a thermometer in the air entering the cellar-side grille and then in the air leaving it. Breezaire treats a drop of 6°F or more as proof that the unit is cooling. Then walk round to the exhaust side and feel for warm air leaving that grille; if the exhaust side is cool and still while the cellar side hums, the condenser fan or the compressor has stopped.

The exhaust room on a hot afternoon

Leave a thermometer in the room the unit exhausts into through a warm afternoon. Self-contained units lose the ability to hold 55°F once that air passes the maker's limit, which is 85°F for WhisperKool's and CellarCool's through-the-wall units and between 78°F and 95°F for the two self-contained models in one Wine-Mate manual. A room that passes its limit only on hot days explains a cellar that warms only on hot days.

A flashlight on both coils

With the power off, shine a light through each grille. Gray felt on the exhaust-side condenser, or white ice on the cellar-side coil, can each explain a warm cellar by itself, and each has its own guide on this site. Do not remove panels for a better view; that is where the wiring and the refrigerant tubing sit.

Source: Breezaire — WKL Series installation instructions — Plug into a GFCI outlet on its own circuit; about a three-minute restart delay after an outage; do not change the setting for 3 days after start-up; air leaving the cold side 6°F or more colder than it enters means the unit works; paper and dark-room tests for leaks

Door, seals and the room

Shut the cellar door on a sheet of paper four times, at the head, the latch edge, the hinge edge and the threshold; in Breezaire's version of the test, paper that pulls out with no drag marks a leak. Then switch the cellar light off, wait for your eyes to adjust, and look for light at the door edges and around the housing of the unit. WhisperKool warns that a door without a good seal keeps the unit running continuously.

  • A bottom sweep that is missing or flattened.
  • Weather stripping that stops short of a corner.
  • A new light fixture, outlet or pipe through a cellar wall with no sealant around it.
  • Glass added to a wall or the door since the unit was chosen.

Source: WhisperKool — SC Pro series owner's manual — Bottle probe in an empty bottle filled 75% with water; air in a cooling cellar reads colder than the liquid; do not use a GFI; a blinking snowflake marks the five-minute anti-short-cycle wait; a selector switch picks the front or rear power inlet; 55°F only with intake air at or below 85°F; a poorly sealed door makes the unit run continuously; Breezaire — WKL Series installation instructions — Plug into a GFCI outlet on its own circuit; about a three-minute restart delay after an outage; do not change the setting for 3 days after start-up; air leaving the cold side 6°F or more colder than it enters means the unit works; paper and dark-room tests for leaks

The drain outlet, and what to write down

Find where the drain line ends: a floor drain, a bucket, a pump reservoir or the outside of the house. It should hang above any water, run downhill the whole way and show signs of recent drips. A dry outlet on a unit that runs for hours through a humid season means the water is going somewhere else.

Before calling, collect the readings in one place. The next guide in this section shows where the model plate sits on each kind of unit.

  • The bottle reading and the display reading, with the time of each.
  • The exhaust room temperature on a warm afternoon.
  • Any code, letter or blinking symbol on the controller, copied exactly.
  • Whether a breaker tripped, and how many times.
  • Photos of the model plate and of both grilles.

Step
by step.

Five steps, in the order worth doing them.

01

Set the bottle overnight

Stand a thermometer probe in a water-filled bottle on a middle rack and leave the door shut until morning.

02

Check the power path

Breaker, outlet, any disconnect at a split system's outdoor unit, and the unit's own power switch.

03

Feel both grilles

With the unit running, look for cold air leaving the cellar side and warm air leaving the exhaust side.

04

Test the door

Paper at four points around the door, then a look for light with the cellar dark.

05

Check the drain and take notes

Confirm the line empties, then record readings and codes before anyone resets anything.

A couple lifting a bottle from a lit stone-walled wine cellar, the cooling unit's grille high on the far wall
For the heart of your home.

Questions
owners ask.

Should I reset the controller before calling?
Not before writing down what it shows. A power cycle clears some alarms and restarts timers, and the history of alarms is often the quickest clue a technician has. Record the characters first, then restart if your manual allows it.
How long do the checks take?
About twenty minutes of hands-on time, plus one night for the bottle reading and one warm afternoon for the exhaust room. The waiting is what makes the readings worth having.
Do I need a second person?
It helps for the light test and the airflow test, with one person on each side of the wall. Alone, do the cellar side first, then walk round to the exhaust side while the unit is still running.
What changes when the condenser is outdoors?
The indoor checks stay the same. Outside, look for leaves, snow or shrubs against the condenser, listen for its fan and confirm its disconnect is on. Leave its service panels and the valves on the line set alone.

The problems
behind it.

Each has a page of its own: what it usually means and the causes in the order worth checking.

All 17 problems
A small stone-walled wine cellar with dark wooden racks full of unlabeled bottles lying on their sides, a through-the-wall cooling unit grille set high on the far wall and a round dial thermometer standing in a glass of water on a tasting shelf in front. The collection is exposed

Wine Cellar Too Warm

6 causes, cheapest first

 A wall-mounted digital controller for a cellar cooling unit on a wood-paneled wine cellar wall, its small screen completely dark, a ceiling supply grille above and rows of unlabeled bottles in wooden racks to the side. Problem

Cellar Cooling Unit Not Turning On

5 causes, cheapest first

 An open gray electrical panel on a dry basement wall beside the closed wooden door of a wine cellar, one breaker switch sitting in the tripped middle position among a neat row of others, a small window in the cellar door showing dim racks of unlabeled bottles. The collection is exposed

Cellar Cooling Unit Tripping the Breaker

5 causes, cheapest first

 A slim wall-mounted cellar cooling controller on a stone wine cellar wall, its screen dark and blank, a thin gray cable running from it along the edge of a wooden rack of unlabeled bottles. Problem

Cellar Cooling Controller Display Blank

4 causes, cheapest first

When it needs
a technician.

The repairs on the right are where this guide ends when the checks do not settle it.

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.

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.

Cellar cooling load and room check

Measuring the cellar as the cooling unit sees it: insulation, vapor barrier, door, glass and the heat load, to show whether the unit can ever keep up.

Cellar evaporator and condenser fan repair

Restoring the two fans a cellar unit depends on: the one that moves cellar air across the cold coil and the one that throws the heat away.

More in
troubleshooting.

What an owner can safely check on a cellar cooling system, from a thermometer and hygrometer among the racks to the controller's set point, the filter, the drain outlet and the exhaust side, and where to stop and book.

The whole section
Checks an owner can make in the cellar

Reading the cellar controller: set point, probes, modes and alarms

What the number on the display measures, why it can differ from the bottles, and how the symbols on common controllers separate a routine mode from an alarm that needs attention.

 Checks an owner can make in the cellar

Find the cooling unit model plate before the visit

The plate is on the housing, not the controller, and on through-the-wall and split systems it often faces a side you cannot see from the cellar; where to look and how to photograph it.

 Guides

All 18 guides

Six sections, by what you are trying to find out.

Back to your everyday

Read it and still not sure?

Book with what you checked and the model number, and the technician starts where the guide stopped.

Schedule a repair Call (844) 398-5977
(844) 398-5977 Schedule a repair