Manitowoc SL1 light: safety limit 1, freeze time too long
Before the Event Log, Manitowoc boards reported the same long-freeze problem with lights.
Mon–Sat, 8am–8pm
- Harvest and freeze cycle
- Ice machine harvest repair
- Source: Manitowoc
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or call (844) 410-9163
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What SL1
actually means.
Before the Event Log, Manitowoc boards reported the same long-freeze problem with lights. On Indigo boards a control board light labeled SL1 flashes. On Q210 and Q270 undercounters there is no SL light; the harvest light flashes continuously, and after the toggle switch is cycled it flashes once for safety limit 1. The Q-series waits an hour in standby after the first stop and stays off after the second.
Manitowoc ice machine display
What to do when SL1 shows on the ice machineKind of codeHarvest and freeze cycle
A freeze ran longer than the board allows, or a harvest started and the ice never fell. Scale on the evaporator holds the sheet to the plate, a thickness probe crusted with minerals never signals, a hot gas valve that does not open leaves the plate cold, a harvest assist that does not push, or a water curtain that swings without tripping its switch all end in this family. A cleaning cycle run by the manual often clears it; a valve or a probe is a technician's job.
Usually leads toIce machine harvest repair
The hot gas valve, harvest assist, curtain switch and thickness probe that decide when a sheet of cubes is done and make it drop.
Shows up asIce Machine Error Code or Flashing Light: What It Is Telling You
An ice machine error code may show as a number on a small display, a pattern of blinking lights on the control board, a colored light on the front, or a machine that stops with one indicator flashing.
MakeManitowoc
With a Manitowoc ice machine, the technician notes what the controls report and checks the bin control before opening the cycle for testing.
SourceManitowoc Indigo ice machines installation, operation and maintenance manual (Part Number 000013325 Rev 02)
Indigo control boards (SL1 light) and Q210/Q270 undercounters (harvest light flashing once). The same event appears as E01 in Indigo Event Logs.
Before you book,
in this order.
Each step comes from Manitowoc's own guidance for SL1 on its ice machines. Follow it to the end: the last card says whether this is a visit.
Move the toggle or On/Off switch to Off and back on, then count the flashes to confirm it is limit 1.
Check that the water is on and the condenser has room to breathe.
Let the head restart; if it stops on the same limit again, book a visit.
Still there?
It usually turns into ice machine harvest repair. Book with the code and the model number.
What not to do
SL1 does not mean the machine has no power; the light proves the board is alive. Two flashes point to safety limit 2, the long harvest, instead.
What you may
notice with it.
The ice machine problems SL1 tends to arrive with. Answer these at the ice machine before anyone is booked.
All problems
Where SL1 usually leads
Ice machine harvest repair.
Manitowoc
ice machines.
With a Manitowoc ice machine, the technician notes what the controls report and checks the bin control before opening the cycle for testing.
Manitowoc ice machine repairMore Manitowoc codes
All 15 Manitowoc codesHarvest and freeze cycle on other makes
Modular ice machine
An ice-making head set on top of a separate storage bin or drink dispenser, cooled by air, water or a condenser on the roof, turning out hundreds of pounds of cubes a day.
Undercounter ice machine
A self-contained ice machine that makes and stores its own ice under a bar, a service counter or a kitchen island, from commercial units to clear-ice models in large homes.
Nugget ice machine
An ice machine that freezes a thin layer inside a chilled cylinder and pushes it out with an auger as soft, chewable nuggets, for clinics, offices, hotels and large homes.
In Manitowoc's own words
A safety limit is indicated by a flashing control board light labeled SL1 or SL2.
Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Indigo control boards (SL1 light) and Q210/Q270 undercounters (harvest light flashing once). The same event appears as E01 in Indigo Event Logs.
Manitowoc SL1 ice machine repair,
where we come out.
The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered.
All service areasTampa BayFL · 31 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
Questions
about SL1.
Can I clear SL1 myself?
Where is the SL1 light on my Manitowoc?
My Manitowoc undercounter waited an hour and restarted. Is that SL1?
Is SL1 the same as E01 on a Manitowoc?
Back to your everyday
Still showing SL1?
A booking with a code goes further when it carries the light or code copied as it appeared, the model and serial off the data plate, and a word on whether cubes still fall into the bin. With those three in hand, our office can match the probable part to your machine the same afternoon.