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The cellar-side grille of a wall-mounted split evaporator in a wine cellar, removed and leaning below it, revealing a thin aluminum coil coated in white frost, wooden racks of unlabeled bottles on the adjoining wall.

Cellar Cooling Evaporator Coil Icing Up

A cellar cooling coil icing up shows as white frost behind the cellar-side grille, weak air from the unit, water dripping when it goes quiet, and a room that warms while the unit keeps running.

(844) 398-5977

Mon–Sat, 8am–8pm

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

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What it
usually means.

The coil on the cellar side of the unit runs a little below freezing on some cycles, and most cellar units melt off any frost between runs, either by resting the compressor while the fan keeps turning or with a timed defrost. Ice builds up when that balance tips: the fan that pushes cellar air through the coil slows or stops, a setting well below 55°F makes the coil run colder for longer, the refrigerant charge drops so the coil runs colder than designed, or the exhaust side gets so hot the system behaves oddly. Humid air from a leaky room adds to it. Once the coil is covered, air cannot pass, the room warms, the unit runs harder and the ice thickens. When it finally melts, it often floods the drain.

A technician crouched beside the insulated copper line set of a wine cellar split cooling system where it enters a garage wall in a US home, holding an electronic leak detector wand to a brazed joint, gauges hanging from the service valves of the small condensing unit beside him. The 5 causes, cheapest first

Answer these first

01

How much of the coil is covered: a light frost on part of it, or a solid block?
02

Does the cellar-side fan turn and blow air through the grille?
03

What is the set temperature, and has it been lowered recently?
04

Is water dripping or pooling when the unit rests?
05

Is the room humid, or has the door been opened a lot lately?

Check these
before you book.

Cellar cooling coil icing up: 5 checks, and none of them costs anything.

01

Turn the unit off from a dry panel and let the coil thaw fully, with a towel under the grille to catch the melt.

02

Keep the cellar door shut while it thaws; if the room passes about 70°F, move the most valuable bottles.

03

When it runs again, check that the cellar-side fan turns and air leaves the grille.

Also worth checking

  • Check the set temperature; bring it back to the mid 50s if it was lowered.
  • Tell us the make, the model number and how often the ice comes back.

How soon does it need a visit?

Not urgent if the room stays cool, but a coil that keeps icing will leave the cellar warm and flood the drain. Thaw it, check the fan and the setting, and book if the ice returns.

The causes,
cheapest first.

5 things cellar cooling evaporator coil icing up turns out to be, from set temperature too low to humid air getting into the room.

The cost guide
  1. 01 no repair

    Set temperature too low

    Most cellar units are designed around the mid 50s. Set much lower, the coil runs below freezing too long and cannot clear. Raise the setting and let the coil thaw.

    No repair: check it yourself
  2. 02 low to moderate

    Cellar-side fan slow or stopped

    Without air moving across it, the coil gets colder and colder and freezes the moisture on it. It is the most common cause.

    Fixed by cellar evaporator and condenser fan repair See cellar cooling unit fan not running
  3. 03 low to moderate

    Defrost control or sensor not ending the cycle

    A coil sensor or a defrost setting that fails to call for a thaw lets frost build cycle after cycle.

    Fixed by cellar coil icing and defrost repair
  4. 04 moderate to highest

    Low refrigerant charge

    A short charge makes part of the coil run much colder than it should. The ice often starts at one corner rather than covering the whole face.

    Fixed by cellar cooling leak search and recharge
  5. 05 varies

    Humid air getting into the room

    A door without a seal or a gap in the vapor barrier brings in moisture that ends up as ice on the coil.

    Fixed by cellar cooling load and room check See wine cellar humidity too high or mold
  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 evaporator coil icing up can show up on any of them. Each mark opens that make's own page.

All 7 brands

Cellar Cooling Evaporator Coil Icing Up,
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 evaporator coil icing up.

Is a little frost on the cellar unit's coil normal?
A light frost that clears between runs is normal on many units. Ice that stays, grows or blocks the air is not.
Can I chip the ice off the coil?
Please do not. The fins and tubes are thin, and a puncture turns an icing problem into a refrigerant leak. Turn the unit off and let the ice melt.
Why does the coil ice up only when I set the cellar colder?
Most cellar units are designed for the mid 50s. Colder settings keep the coil below freezing for longer than the defrost can handle. White wine service temperatures are for a separate cabinet, not for the whole cellar.
The coil thawed and the unit works fine now. Should I still book?
If it stays clear for weeks, perhaps not. If the ice comes back in a few days, something is making it, usually the fan or the charge, and it will return until that is fixed.

Back to your everyday

Still seeing cellar cooling evaporator coil icing up?

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

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