--- title: "KoolAire SL#1 and SL#2 flashing together: service limit 3, no water" description: "What SL#1 + SL#2 means on KoolAire SL#1 and SL#2 flashing together: service limit 3, no waters, what to check before booking, and when it is not a failure at…" url: "https://icemachinerepair.center/error-codes/koolaire-sl3/" --- # KoolAire SL#1 and SL#2 flashing together: service limit 3, no water When a KoolAire head fills, water should lift the harvest float within four minutes of the inlet valve opening. ## What SL#1 + SL#2 actually means. When a KoolAire head fills, water should lift the harvest float within four minutes of the inlet valve opening. If it does not, the board pauses the head for 30 minutes with both lights flashing, then tries again. After 100 misses in a row it stops. A closed supply valve, a blocked filter, a clogged inlet screen, a dump valve stuck open, or a float that sticks are the usual reasons. Koolaire ice machine display What to do when SL#1 + SL#2 shows on the ice machine ### Kind of code Water supply The water side came up short: the trough did not fill in the time allowed, the float or level probe never saw water, or water kept flowing when the inlet valve should have closed. A supply valve left partly shut, a clogged filter cartridge, low building pressure or a sticking inlet valve are the usual causes. Opening the valve fully and fitting a fresh filter clears the simple cases; a valve that hums without passing water is a visit. ### Usually leads to Ice machine water valve and filter repair The inlet valve, filter, sump float or level probe and supply line, tested and replaced when water arrives short, dirty or nonstop. ### Shows up as Ice 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. ### Make Koolaire KoolAire ice machine service begins with a look at the air filter, the condenser fins and the water trough. ### Source KoolAire K, KP and KT modular ice machines technician's handbook (Part Number 000018624 Rev 00) KoolAire K, KP and KT Kube heads with the toggle-switch control board. Boards with software revision 3.2 and later cap the freeze at 35 minutes and the harvest at 7 minutes; earlier boards use 60 and 3.5 minutes. The first cycle after a manual start or a full bin is exempt from this check. ## Before you book, in this order. Each step comes from Koolaire's own guidance for SL#1 + SL#2 on its ice machines. Follow it to the end: the last card says whether this is a visit. 01 Check that the water supply valve to the head is fully open and that the filter cartridge is not overdue. 02 Look in the trough: if water drains away as fast as it enters, the dump valve may be stuck open. 03 Wait for the 30-minute pause to end; if both lights keep flashing on the next fill, book a visit. ### Still there? It usually turns into [ice machine water valve and filter repair](https://icemachinerepair.center/services/ice-machine-water-valve-and-filter-repair/). Book with the code and the model number. ### What not to do Two lights at once are not two problems; together they are a separate, water-side limit. It also does not mean the head has lost power, since the board is clearly awake. ## What you may notice with it. The ice machine problems SL#1 + SL#2 tends to arrive with. Answer these at the ice machine before anyone is booked. [All problems](https://icemachinerepair.center/problems/) Before you call ### [Ice Machine Error Code or Flashing Light: What It Is Telling You](https://icemachinerepair.center/problems/ice-machine-error-code/) [All 7 causes, cheapest first](https://icemachinerepair.center/problems/ice-machine-error-code/) It also comes with - [**Ice Machine Running but Not Making Ice**](https://icemachinerepair.center/problems/ice-machine-not-making-ice/) - [**Ice Machine Water Running Nonstop to the Drain**](https://icemachinerepair.center/problems/ice-machine-water-running-constantly/) - [**Ice Machine Making Too Little Ice for the Rush**](https://icemachinerepair.center/problems/ice-machine-making-little-ice/) Problem ### Ice Machine Error Code or Flashing Light: What It Is Telling You 7 causes, cheapest first Where SL#1 + SL#2 usually leads ## Ice machine water valve and filter repair. **Inlet valve, sump float or level probe, supply line and filter head · low to moderate.** Book a visit [What the job involves](https://icemachinerepair.center/services/ice-machine-water-valve-and-filter-repair/) ## Koolaire ice machines. KoolAire ice machine service begins with a look at the air filter, the condenser fins and the water trough. [Koolaire ice machine repair](https://icemachinerepair.center/brands/koolaire/) More Koolaire codes [SL#1](https://icemachinerepair.center/error-codes/koolaire-sl1/) [SL#2](https://icemachinerepair.center/error-codes/koolaire-sl2/) [Clean light flashing](https://icemachinerepair.center/error-codes/koolaire-clean-light/) Water supply on other makes [Atosa E5](https://icemachinerepair.center/error-codes/atosa-e5/) [Blue Air E5](https://icemachinerepair.center/error-codes/blue-air-e5/) [Follett LO WATER](https://icemachinerepair.center/error-codes/follett-lo-water/) [Hoshizaki 5 beeps](https://icemachinerepair.center/error-codes/hoshizaki-5-beeps/) [Ice-O-Matic Error 3](https://icemachinerepair.center/error-codes/ice-o-matic-error-3/) [KitchenAid Order Filter](https://icemachinerepair.center/error-codes/kitchenaid-order-filter/) [Manitowoc E20](https://icemachinerepair.center/error-codes/manitowoc-e20/) [Marvel Er15](https://icemachinerepair.center/error-codes/marvel-er15/) [All 27 codes of this kind](https://icemachinerepair.center/error-codes/#family-water) Koolaire builds this ### 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. Koolaire builds this ### 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. ## In Koolaire's own words > Service limit 3 is indicated by both SL#1 & SL#2 flashing. [KoolAire K, KP and KT modular ice machines technician's handbook (Part Number 000018624 Rev 00)](https://www.koolaire.com/asset/?id=xdlalu®ions=us&prefLang=en-US&download=yes) [KoolAire K, KP and KT modular ice machines technician's handbook (Part Number 000018624 Rev 00)](https://www.koolaire.com/asset/?id=xdlalu®ions=us&prefLang=en-US&download=yes) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. KoolAire K, KP and KT Kube heads with the toggle-switch control board. Boards with software revision 3.2 and later cap the freeze at 35 minutes and the harvest at 7 minutes; earlier boards use 60 and 3.5 minutes. The first cycle after a manual start or a full bin is exempt from this check. ## Koolaire SL#1 + SL#2 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. 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Check that the water supply valve to the head is fully open and that the filter cartridge is not overdue. If it comes back, it needs a visit. ### My KoolAire flashes both lights, then restarts by itself. Is that normal? That is how service limit 3 works: a 30-minute pause, then another attempt. If the water problem has passed, the head carries on; if not, it pauses again. ### Can a new water filter cause both KoolAire lights to flash? A filter that is installed wrong, or a supply valve left partly closed after the change, can starve the fill. Check the valve first. ### Why do both lights on my KoolAire blink three times at start-up? The board repeats the last service limit 3 at start-up until 100 normal cycles erase it, so a short blink on power-up can be history rather than a new problem. --- **[Read on the site: KoolAire SL#1 and SL#2 flashing together: service limit 3, no water](https://icemachinerepair.center/error-codes/koolaire-sl3/)** **[Book a visit with IceMachineRepair.center](https://icemachinerepair.center/schedule/)**