Manitowoc Control Board Lights November 25 2014, 23 Comments
The lights on the Manitowoc control board can tell you a lot about what's going on with your ice machine. Depending on which lights are lit or which lights are out can help you diagnose the problematic ice maker. Although there are a number of different control boards, most function similarly, so I'll be discussing only the basics in this article.
Clean Light
The clean light should be lit anytime the ice machine toggle switch has been moved to the clean cycle. This light will remain illuminated throughout the entire clean cycle. The ice machine will not produce ice while the clean light is on.
Bin Switch Light
Most Manitowoc control boards will have a light labeled bin switch or left bin, right bin. This light indicates when the water curtain magnet is making contact with the bin switch. This will tell the ice machine when it is full or should terminate the harvest cycle. If you open the water curtain or damper door, the light should go out. Anytime that light is on, the bin switch should be satisfied and the unit should be producing ice.
Water Probe Light
The water level probe light is typically labeled WTR PROBE. This light will light anytime water makes contact with the water level probe. It should remain on anytime the water level is submerged in water. Once the water level inside the water trough drops, below the water level probe, the light should go off.
Ice Thickness Light
This light will turn on anytime water comes in contact with the ice thickness control, which is mounted to the top of the evaporator. The ice thickness light is typically marked ICE PROBE. In some ice machines, this light is also the same light that indicates when the ice machine is in it's harvest cycle. The light will go out after the harvest has terminated. It is also normal for this light to flash on the control board, as water splashes and hits the probe during the freeze cycle.
Safety Limit Light
On older Manitowoc ice machines, there is a single light that flashes, to indicate which safety limit the ice machine turned off on. However, on newer Manitowoc ice makers, each safety limit has it's own light. These lights are labeled SL1 and SL2, which either indicate the ice machine shut off on a long freeze cycle or a long harvest cycle. These lights are very important at helping diagnose an ice machine, as it tell you which cycle the machine was having problems in.
Identifying The Correct Part
These lights help indicate when a specific ice machine part may need replaced. The most common parts associated with these lights are water level probes, ice thickness controls, and bin switches. Please note that Manitowoc ice machines use different ice maker parts, depending on which model machine you have. Be sure to confirm which part fits your ice machine before ordering and if you have any questions, please email us at sales@icemakerpartsshop.com.
Comments
I recently bought a used series 250. Model number BD0252A . It will dump maybe three batches of ice before it shuts down. When I open the control panel cover I noticed the harvest light is blinking constantly. I bought a new Magnet because I thought it could be the curtain door but the magnet I got shipped to me just has a nipple to the back of it where as this magnet or sensor on the ice tray is wired. The magnet on the curtain is still in place. I noticed there is one more sensor with the red wires for the cube thickness. I don’t know what else it could be and if it’s possibly the curtain sensor how would I go about ordering that? I see on some posts that not keeping the condenser cleaning is a big part of it’s not running efficient. I’m not quite sure how to go about doing that and the solution to be used. Any help would be appreciated because I’m sure it’s worth fixing. Thank you
Joe musa on December 22 2017 at 11:42AM
My ice machine manitowoc model BD0803W macking ice fine put don’t drop it to the pen I have to open the door
Wally on December 10 2017 at 04:20PM
570 s model won’t mk ice Goes thru cycles but no ice and no harvest I have messed with switches and made it work lately Looks like I get two short blinks from the red harvest light
eric on October 20 2017 at 01:29PM
SD0503W- till yesterday machine worked perfectly -now all led indicators respond right in cleaning cycle and after that when switched to ice machine stays silent -no reaction at all -did cleaning again ,water pump works normally and again after that process when switched to Off then ICE it is no reaction at all -any Idea ?
eric on October 20 2017 at 01:14PM
SD0503W- till yesterday machine worked perfectly -now all led indicators respond right in cleaning cycle and after that when switched to ice machine stays silent -no reaction at all -did cleaning again ,water pump works normally and again after that process when switched to Off then ICE it is no reaction at all -any Idea ?
Casey on August 25 2017 at 06:59PM
Model#SD0502A
Machine runs in clean cycle,but not in ice. Clean light is on when switched to clean cycle. If bypassed everything possible (minus the board and relay). The water probe works. The inlet valve doesn’t even turn on while flipped to ice. Any thoughts?
Oak grant on August 02 2017 at 10:49PM
Blake Construction & Design on July 28 2017 at 11:30AM
(SD0452A) The SL1 light comes on after about an hour which makes the unit shut down could this be the PC board? or is there anything else that I can try before I have to purchase PC board?
Angie Lennex on July 08 2017 at 09:32PM
Have a Manitowc ice machine SY0304A runs fine I started it to make ice and it just runs…no harvesting of the ice….I have a 2 solid green lights on the board…top and then a few lights down…the lower one starts to flash on and off after awhile….what is going on….
Raph tremblay on May 03 2017 at 11:58AM
Hey all i got a questions , once in a while my manitowoc sd0322a get stuck during a cycle and they light rmt bin is lit on the board , i need to unplug n replug the 120v and the problemes is gone , anyone know whats it is ?
Sean on March 04 2017 at 03:57AM
Hi I have a counter top ice maker sws model swm200 and it fills with Water and fan starts then you can hear fan click off and a warning symbol shows on screen any advice on how to fix this please
Cheers sean
dan on October 29 2016 at 08:25AM
model SY1094N
Our ice machine is working, but the harvest time is too bad. Its like 1 harvest in every 15 minutes. Our maintenance checked already the fan motor and rewind it. Bit still after a few days, it begins to slow down again. What was the problem?
Wendy on October 26 2016 at 05:18AM
Older manitowoc QY0214A
Only seeing green light and red light (nothing blinks, etc) ice machine compressor kicks on, pump runs water for 30 – 35 seconds and stops. Any thoughts?
Tim Norment on June 27 2016 at 03:57AM
I have a Manitowac ice Machine. The water probe light is on and water keeps overflowing into the ice bin. Not sure what wrong. Ran great for about 2 months then this. The model number is SYO454A. Please help…
Thanks Tim
Tim Norment on June 27 2016 at 03:51AM
I have a Manitowac ice Machine. The water probe light is on and water keeps overflowing into the ice bin. Not sure what wrong. Ran great for about 2 months then this. Please help
Thanks Tim
Tim ackley on June 14 2016 at 03:10PM
Machine will make 2 or 3 batches of ice fine then it will dump all water but the pump and compressor keeps running till the compressor freezes changed the control board has new dump and fill valve even tried an isolated ground but nothing has worked.
Tim ackley on June 14 2016 at 06:52AM
Machine will make 2 or 3 batches of ice fine then it will dump all water but the pump and compressor keeps running till the compressor freezes changed the control board has new dump and fill valve even tried an isolated ground but nothing has worked.
adam johmson on June 08 2016 at 06:49PM
Manitowoc sd0302a freezes up before harvest no mater where the ice probe is
Will on October 12 2015 at 04:52PM
Change ice thickness prob that is what controls/ tells the machine to drop ice when ready . It sends it into harvest ! Ice prob check / clean all probs
Lynn - Ice Maker Parts Shop Admin on December 15 2014 at 09:17AM
@Mario, typically this is caused by the evaporator being dirty or pitted. When was the last time the evaporator was thoroughly cleaned? Keep in mind, that is a tin evaporator on the SM50, so metal safe cleaner must be used.
@antonio, hard to say with so little information. Let me know model number of your ice machine, along with if the machine actually goes into harvest or not.
Thanks.
antonio on December 13 2014 at 11:57PM
I found the evaporator plate of the icemaker with solid ice. why this happen?
mario on December 11 2014 at 03:15PM
I have ice machine manitow mod SM50 in the control board is flashing red light constantly and make ice too long time thaks
Lynn - Ice Maker Parts Shop Admin on December 09 2014 at 10:13AM
@Joe, it’s possible you have a bad fan motor or more likely the fan cycle control has failed. The way to test this is to jump out the fan cycle, so that the fan motor always runs. If the fan comes on, the replacing the fan cycle control will be necessary.
Joe on December 02 2014 at 07:48PM
Qdo602A
Compressor is hot to touch fan motor hasn’t kicked on evaporator won’t freeze