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Cocktail bar: three back-bar coolers, one iced solid and freezing the garnish

Client: Cocktail bar
Collage of four photos from the cocktail bar job: the iced coil, the frozen garnish and the display reading 39, the thawed coil, the product temperatures
Scope
Back-bar cooler diagnosis and repair, with the two neighbouring units checked on the same visit
Timeline
One visit
Location
New York City
Year completed
2026
What was delivered
  • Iced evaporator coil thawed
  • Defrost operation checked
  • Door seals checked
  • The two neighbouring coolers checked while under the bar
  • Product zones verified at 37.0°F and 36.1°F with the bar at 71°F and 42% RH

The call

Three back-bar coolers under a cocktail bar. Two fine. One freezing the garnish and, according to the bartenders, sweating. The controller on the front said 39 and looked happy about it.

The row of stainless back-bar coolers under the bar top. Unit 2 was the one freezing product.
The row of stainless back-bar coolers under the bar top. Unit 2 was the one freezing product.

What we found

The front grille came off and the evaporator coil was iced solid, top to bottom. A back-bar cooler runs its coil right behind the doors, so when it ices, air stops moving through the cabinet. Whatever sits nearest the coil freezes and whatever sits furthest away warms up. A jar of peppers on the top shelf had done the freezing.

The evaporator coil behind the grille, iced solid from top to bottom.
The evaporator coil behind the grille, iced solid from top to bottom.
Left: the jar of peppers and two frozen peppers off the top shelf. Right: the controller reading 39, because its probe was reading the air coming off a block of ice.
Left: the jar of peppers and two frozen peppers off the top shelf. Right: the controller reading 39, because its probe was reading the air coming off a block of ice.

The display was not lying, it was measuring the wrong thing. Its probe sat in air coming off the ice, so it reported a cabinet that was fine while the product told a different story. Bar coolers ice for a short list of reasons: defrost not running, doors left ajar on a busy night with the bar at 71 degrees and 42 percent humidity, or a gasket that has given up.

The work, in order

  1. Coil thawed.
  2. Defrost operation checked.
  3. Door seals checked.
  4. The other two units checked while we were under the bar, because three coolers of the same age fail on roughly the same calendar.
  5. Product zones measured with our own instruments rather than the controller display.
The same coil after thawing: wet, clear and moving air again, with the controller probe visible at the coil face.
The same coil after thawing: wet, clear and moving air again, with the controller probe visible at the coil face.

Verified before leaving

Two thermo-hygrometers on the bar top, each with its probe in a cooler’s product zone. One unit at 37.0 degrees, the next at 36.1, with the bar itself at 71 degrees and 42 percent relative humidity. That is a working set.

Two TA318 thermo-hygrometers: bar air 71.2 and 71.6°F, product zones 37.0 and 36.1°F, 42% RH.
Two TA318 thermo-hygrometers: bar air 71.2 and 71.6°F, product zones 37.0 and 36.1°F, 42% RH.

Equipment and readings

CoolersThree stainless back-bar coolers under the bar, digital controller, same age
FaultEvaporator coil iced solid on one unit; controller reading 39 off the ice
ChecksDefrost operation, door seals, both neighbouring units
ReadingsProduct zones 37.0°F and 36.1°F; bar 71.2 to 71.6°F, 42% RH

What this means if you manage the venue

If a bar cooler starts freezing the garnish, do not turn it up. Turning it up hides the symptom; looking at the coil finds the cause. And when one of a matched set fails, the cheapest time to look at the others is while the tools are already under the bar.

From the job log: Three bar coolers, one freezing the garnish (scheduled for 15 Dec 2026, link follows).

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