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Close view into the open front of a stainless modular ice machine head, a thick, solid sheet of clear cubes frozen across the whole evaporator plate and bulging over the clear plastic water curtain, frost on the edges of the ice machine's plate, the ice bin below empty.

Ice Machine Not Harvesting: Ice Stays Stuck on the Plate

An ice machine not harvesting leaves a thick slab frozen to the evaporator, ice bridging across the plate and over the curtain, or a machine that clicks into harvest and back without anything dropping into the bin.

(844) 410-9163

Mon–Sat, 8am–8pm

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

Book a visit

Three short steps, about a minute.

or call (844) 410-9163

What it
usually means.

At the end of each freeze, the board switches to harvest. A hot gas valve sends warm gas from the compressor through the evaporator to loosen the slab, water may run over the back of the plate to help it, and on many machines a harvest assist, a small motor or a solenoid with a pin, pushes the slab off. The falling slab swings the water curtain or passes a sensor, which tells the board harvest is done and the next freeze can begin. If the slab does not let go, it keeps growing into a solid block that can bend the curtain and stall the machine. Scale on the plate is the most common reason: hard water and a skipped descale give the ice something to hold onto. After that come the parts: a hot gas valve that does not open, a harvest assist motor that has stopped, a curtain switch that does not report, or a board that ends harvest too early. A thick sheet of ice covering the whole head is never chipped off with a tool; it is melted on the maker's procedure.

A technician in a plain gray work shirt stands beside a stainless modular ice machine on its ice bin in a restaurant back-of-house, holding a small notepad and looking at a handful of clear square ice cubes in a plain stainless scoop, the ice bin door open behind the scoop, the ice machine's front panel in place. The 6 causes, cheapest first

Answer these first

01

Is there a slab on the plate that never drops, or ice built up over the curtain and the tube?
02

Do you hear a click or a hiss as harvest starts, and a motor or pin moving?
03

Does the curtain swing when ice falls, or is it jammed by ice?
04

When was the machine last descaled, and is the water in the area hard?
05

Is there a code or a flashing light showing a long harvest?

Check these
before you book.

Ice machine not harvesting: 5 checks, and none of them costs anything.

01

Switch the machine off with its selector and let a stuck slab melt free on its own; never chip at it with a scoop, knife or tool.

02

Once it is free, check that the curtain hangs as the manual shows and swings freely.

03

If the descale is overdue, run the maker's cleaning cycle with the approved product exactly as directed.

Also worth checking

  • Switch back to ice, watch one harvest through the front, and note whether a motor or pin moves.
  • Note any code and photograph the data plate for the visit.

How soon does it need a visit?

A machine that does not harvest stops making ice, so book soon. It is not a safety emergency; keep it off rather than letting a solid block build up over the head.

The causes,
cheapest first.

6 things ice machine not harvesting: ice stays stuck on the plate turns out to be, from a curtain out of place or jammed to a board ending harvest too early.

The cost guide
  1. 01 no repair

    A curtain out of place or jammed

    A curtain that was hung wrong after cleaning, or is held by ice, never tells the board the slab fell. Rehanging it as the manual shows often fixes the cycle.

    No repair: check it yourself
  2. 02 low

    Scale on the evaporator holding the slab

    Mineral scale gives ice a grip on the plate, so harvest runs out of time. A descale with the maker's cleaner usually restores clean drops.

    Fixed by ice machine cleaning and sanitizing
  3. 03 low to moderate

    A harvest assist motor or pin that has stopped

    Many current machines push the slab off with a small motor or solenoid. When it wears out, the slab needs much longer to fall or stays put.

    Fixed by ice machine harvest repair
  4. 04 low to moderate

    A curtain switch or harvest sensor out of order

    A magnetic switch or sensor that does not report the drop stops the cycle or loops harvest. It is checked and replaced on a visit.

    Fixed by ice machine bin control repair
  5. 05 moderate

    A hot gas valve that does not open

    Without warm gas through the plate, the slab stays frozen. The valve coil is tested and the valve replaced if needed.

    Fixed by ice machine harvest repair
  6. 06 moderate to highest

    A board ending harvest too early

    A board with a wrong setting or a failing output can cut harvest short. The inputs and outputs are checked before the board is replaced.

    Fixed by ice machine control board repair

The makes
it happens on.

20 makes on this site; ice machine not harvesting: ice stays stuck on the plate can show up on any of them. Each mark opens that make's own page.

All 20 brands

Ice Machine Not Harvesting: Ice Stays Stuck on the Plate,
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

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Questions about
ice machine not harvesting: ice stays stuck on the plate.

Can we chip the ice off the evaporator to get the machine going?
No. A tool can puncture the plate or the tubing behind it, and on an R-290 machine that is a gas leak. Let it melt off with the machine switched off.
Why did the ice machine stop harvesting after cleaning?
Often the curtain or a sensor was not put back as the manual shows, so the board never sees the drop. Recheck its position first.
What does the harvest assist do on an ice machine?
It pushes the slab off the plate so harvest is shorter and uses less energy. When it stops, harvests take longer or fail.
Does descaling really help an ice machine harvest?
Yes. Scale is the most common reason ice sticks to the plate, and a descale on the maker's schedule prevents most harvest trouble.

Back to your everyday

Still seeing ice machine not harvesting: ice stays stuck on the plate?

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

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