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A ducted wine cellar with a white supply grille in the wood-paneled ceiling above tall racks of unlabeled bottles, a small wall clock with a plain face on the end panel and a faint shimmer of cool air below the grille.

Cellar Cooling Unit Running Constantly

A cellar cooling unit running constantly never falls quiet: the compressor hums all day and night, the exhaust side stays warm, and the cellar either barely holds its temperature or drifts slowly upward.

(844) 398-5977

Mon–Sat, 8am–8pm

  • 5 checks before you book
  • 5 questions that narrow it
  • 5 causes, cheapest first

Book a visit

Three short steps, about a minute.

or call (844) 398-5977

What it
usually means.

A cellar unit is chosen to handle the heat the room gains, and in a sealed, insulated cellar it should rest for part of every hour. When it cannot, the gap is on one of two sides. Either the room is taking in more heat than planned, through a door that no longer seals, a missing piece of insulation, glass, lights left on, or a hot exhaust space that makes every hour of running less effective; or the unit has lost capacity, through a dirty condenser coil, a slow fan, a low refrigerant charge or a worn compressor. It can also be the controller: a sensor that reads warm or a relay stuck closed will keep the compressor running in a room that is already cold. Constant running is not an emergency, but it wears the compressor, dries the air, and is often the first sign of a unit about to lose ground.

A technician on a short stepladder in a US home wine cellar holds a digital thermometer probe up to the grille of a wall-mounted cellar cooling unit, stone walls and dark wooden racks of wine bottles around him, cool soft lighting. The 5 causes, cheapest first

Answer these first

01

Is the cellar holding near 55°F, drifting warmer, or getting colder than the setting?
02

How warm is the space where the exhaust goes, and is there open air around the hot-side grille?
03

When was the condenser coil on the hot side last cleaned?
04

Are the cellar lights left on, and is the door weatherstrip intact on all sides?
05

Did the running start with hot weather, or after a change to the room?

Check these
before you book.

Cellar cooling unit running constantly: 5 checks, and none of them costs anything.

01

Note the cellar temperature on a thermometer in water, and whether it is holding, rising or falling.

02

Clear the space around the exhaust grille and feel how warm that room is.

03

Check that the cellar door closes firmly against its weatherstrip and that the lights are off when nobody is inside.

Also worth checking

  • Look at the hot-side coil through its grille for a mat of dust.
  • Tell us the make, the model number and when the constant running began.

How soon does it need a visit?

Not urgent while the cellar holds its temperature. Book within a week or two; if the room starts warming, it becomes urgent.

The causes,
cheapest first.

5 things cellar cooling unit running constantly turns out to be, from exhaust space too hot to room load higher than the unit's capacity.

The cost guide
  1. 01 no repair

    Exhaust space too hot

    A unit breathing into a closed closet or a hot garage works far harder. Open the space or give it ventilation and watch whether the running shortens.

    No repair: check it yourself
  2. 02 low

    Condenser coil clogged with dust

    A dusty hot-side coil sheds heat slowly, so each hour of running removes less heat from the cellar.

    Fixed by cellar evaporator and condenser fan repair
  3. 03 low to moderate

    Sensor or relay keeping it on

    A sensor reading warm or a relay that stays closed makes the unit run in a cold room.

    Fixed by cellar controller and sensor repair See wine cellar too cold
  4. 04 moderate to highest

    Low refrigerant charge

    A slow leak leaves the unit running long and cooling little. On a split system, the flare fittings and the line set are common places to find it.

    Fixed by cellar cooling leak search and recharge On a split-system cellar cooling
  5. 05 varies

    Room load higher than the unit's capacity

    A door gap, a new glass wall or missing insulation raises the heat load until the unit can no longer rest. A room check measures it and shows whether sealing will do or a larger unit is needed.

    Fixed by cellar cooling load and room check
  6. What it costs

    Every repair on the site's cost scale, side by side

    Open the cost guide

The makes
it happens on.

7 makes on this site; cellar cooling unit running constantly can show up on any of them. Each mark opens that make's own page.

All 7 brands

Cellar Cooling Unit Running Constantly,
where we come out.

9 metros, each with its own page.

All service areas

Tampa BayFL · 31 areas

OrlandoFL · 30 areas

Miami / South FloridaFL · 47 areas

New York MetroNY · 75 areas

HoustonTX · 36 areas

ChicagoIL · 50 areas

Los AngelesCA · 95 areas

San DiegoCA · 31 areas

San Francisco Bay AreaCA · 74 areas

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 about
cellar cooling unit running constantly.

How many hours a day should a wine cellar unit run?
It depends on the room and the season, but a well-sized unit in a sealed cellar rests for part of every hour on a mild day. Running with no rest at all, day after day, points to too much load or lost capacity.
Will constant running wear out the compressor?
It adds hours and heat, and a compressor running hot for months ages faster. It also dries the cellar air. Fixing the cause usually costs less than living with it.
My unit runs all summer but rests in winter. Is that a problem?
It is common for a unit sized close to the limit. If the cellar holds its temperature, it may be acceptable, but a clean condenser coil and a cooler exhaust space often give it back some rest.
Do cellar lights make a difference?
Yes. Lights left on add heat all day, and older bulbs add a lot of it. LED lighting on a door switch or a timer is an easy gain.

Back to your everyday

Still seeing cellar cooling unit running constantly?

Book with what you checked above — 5 answers save the technician the first part of the visit.

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