Manitowoc S Series Ice Machine Safety Timers January 15 2015, 4 Comments
Manitowoc S Series ice machines are considered the best commercial ice machines produced. They had just the right mix of new technology and old technology that made a reliable, long lasting piece of equipment. The longevity of the S Series, like model SY0454A, SD0302A, SY0304A, and SY0604A, is due to the control boards ability to protect expensive components with safety timers.
Safety timers are used to shut off the ice machine, in case an ice making cycle is out of spec. This provides protection to a compressor, that may be short cycling, or loss of water through inlet valves. Below are the 3 main safety timers, which are indicated by flashing safety limit lights on the control board.
- The ice machine is locked into the freeze cycle for 6 minutes before a harvest cycle can be initiated.
- The maximum freeze time is 60 minutes at which time the control board automatically initiates a harvest sequence.
- The maximum harvest time is 3.5 minutes at which time the control board automatically ends the harvest cycle. When the bin switch is closed a freeze sequence initiates. When the bin switch is open an automatic shutoff sequence initiates.
In addition to these safety timers, the S Series ice maker also features a warm rinse cycle. The warm rinse cycle allows the ice machine to defrost the back of the evaporator, where ice can form, but not harvest. After 200 freeze/harvest cycles the control board will put the S Series into a warm water rinse.
A warm water rinse cycle is indicated on the control board. If both the clean and harvest LEDs are on, the machine is in a warm water rinse. It’s best to let the warm water rinse cycle continue and complete. However, the cycle can be cancelled by toggling the ICE/OFF/ON switch to the OFF position, then switching back to ICE.
If you have Manitowoc S Series ice machine diagnostic questions, please feel free to contact Ice Maker Parts Shop at sales@icemakerpartsshop.com. We are happy to help with Manitowoc ice machine parts research and any diagnostic assistance.
Comments
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mar on March 28 2016 at 10:26PM
I have ice maker model sy0604a serial 110052979 the problem for is when I turn toogle switch to on position start running water and start runnig the compressor for around 30 seconds and stop and the green light on the control board turn off but, after around 2 minutes the lights turn on running water start running compressor for around 30 seconds and stop lights on the control board turn off what can be replaced to fix the ice marker
Lynn - Ice Maker Parts Shop Admin on January 26 2015 at 01:09PM
@Daniel, I’d be happy to help. What is the model number of your ice machine? Also, why did you think it was the water inlet valve? Is the machine not bringing water in, not enough, losing water?
Typically, a shortage of water can be caused by a dirty water level probe or a stuck dump valve letting water down the drain. A model number will help me help you diagnose.
Daniel Cardenas on January 23 2015 at 09:43PM
I have commercial Manitowoc ice machine , It makes a bout 4 cycles making ice, then it stops ? I thought it was the water valve, so i installed a new one , it worked then it stopped after 4 cycles? The whole machine stops !
Please help me .
Daniel