Before Replacing A Manitowoc Control Board January 09 2014, 77 Comments

on my machine everything was replaced. water level probe, circuit board. but water kept over filling.. what would you say the issue would be?

I have a model SD0302A I thank it is stuck in the harvest mod. and will not make ice. I have checked the water probe/ ben switch and Ice Thickness switch. can you help.

Working on Manitowoc qd0422a. Ran through all the checks listed in manual. Nothing happens when switched to ice. Did get it to finally do something in “clean” by manipulating the wires to bend the tabs on switch. Switch tested good in run mode did show intermittent trouble in clean, so I ordered new one but I don’t think this will cure the main issue – nothing in run mode. No lights, no water pumping, nothing. I pushed contactor and compressor came on. I only read 5vdc on the low volt side, although I don’t know for sure, I’m expecting more like 12 or 24 vdc. I am very close to ordering a board. Thoughts.

Model sd502a will make tiny cubes,one tyme snd barely kick off of the evaporator, the next tyme it will freeze a sheet so thick that it freezes to my new ice thickness probe

i have a QD0602A manitowoc,makes plenty of ice ,when bin is full continues making ice,never shuts down

I have s1000 model.
Ice is making only 1/3 bottom and getting less.
I changed the probe.

I have an Manitowoc QYO 214A that makes ice,and and then shuts off when full….I take ice out a few times,and it works fine,then after maybe a day,it gets full and ice falls from evaporator,and leans on evaporator,then stops making ice as it should,except now the whole evaporator freezes up,gets really “frosted”,with know water running over it….I let it defrost,and it will work fine until it does this again….Where do I start?

thank you

jeff

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Bin light wont go off so it can start the ice cycle.
Any suggestions

I have a manitowoc
QF0400 flake
Bin sensor light stays on, changed out and stays on . What else could cause this?

i have a qm45a
board leds not lighting up,
red led some times faintly lit,
both leds light brightly momentarily when reconnecting molex plug,
replaced board,same problem exists,
tried power from different circuit,
ohm d out molex plug ok,
red led lit brightly at one point and pump only ran for a few moments,
any ideas/
?

have a Manitowoc ice machine the dump valve Is110v no matter if switch is on or off there is constant 110 volts at dump valve connector it will make ice but have to turn it on and off with the dump valve disconnected empty’s water tray it is a SY1474C model maker new switch and dump valve

QM45A : Won’t make ice. Compressor runs, water flows over curtain, solid green light on board, every 5 minutes or so, red light flashes once. No error code description on machine. Any ideas ?

My manitowoc IT0504 machine is not making a solid ice. I adjusted the ice thickness probe clockwise 1/2 turn and has made it thicker. How do I make the ice harder though? When the ice drops, it seems a bit wet and not solid enough
.. what adjustmemts can be made? Thanks

i got a QM30A MODEL MANITOWOC NOT GETTING ANY POWER TO THE PUMP NEITHER CONDENSER FAN OR COMPRESSOR ARE RUNNING BUT I CAN SEE THE RED LED LIGHT IN THE CIRCUIT BOARD ON . THIS COULD BE A CIRCUIT BOARD ISSUE?

QY0214A – nothing happens when putting switch in ice/wash position. There is power to the unit as I can manually push contactor in and energize compressor. I leaned toward bin switch, but I don’t believe the bin switch is needed in wash position? Fuse on bottom of control board is good. So my only other thought would be control board? So to be clear I have power coming in the unit, there are no LED’s on in either ice/wash mode, but I don’t think the Bin LED comes on in wash mode so it seems some other issue. There are 3 relays on the board is there any way to test them? The unit acts as if no power except I can push in contactor and compressor starts up and runs normal and I have checked for voltage on the L1/L2 incoming line and found 120v.

I jumped up and ordered a new dump valve from y’all. Touch wood. Can’t touch ice!

I have a venerable QD0452A that I love to pieces. As usual when we get our first crazy hot day, all our refrigeration flailed. The ice machine was frankly dirty. I cleaned the hoses, pumps, sensors, etc and ran the clean cycle twice with proper nickel safe cleaner. The cleaning cycle took 2hrs plus. The second time I interrupted it and tried to ice, with the trick of turning Off/Ice four times slowly. Two flashes on the harvest light, and nothing doing. I had read that the machine can get stuck in clean mode….so I restarted another cycle and went home.
This morning it fired right up and made ice all day. At 4pm or so, it shut down…with harvest problems. I turned it off, turned it on…and it ran fine for another two hours.
This time it actually has not shut down. The purge pump is stuck on, and dumps water in ice mode and clean mode. The cuber frosts up dry forever if I let it…..even in clean mode.
When I turn it on from unplugged, I get two flashes….but it hasn’t harvested in hours.
Could a bad IT sensor do this?
From where I sit….nothing makes sense, so i fear control board.
Many thanks for your help….this is not just a machine but a member of our family…in a store and bar in the middle of nowhere in the mountains.

runs for 5 minutes then gets no power , i have a spare controller board and it does the same thing like the board is not getting power ? any suggestions ?

I have a BD0602A ice machine. None of the led lights will come on. It has power to the top of the board and the big fuse is good! How do I check or get to the little transformer fuse?

makes ice fine after 3or 4 dumps harvest light comes on and keeps blinking both green lights are on cut switch off and back on goes back to making ice for several times then does it again what do you think may be causing this

On a air cooled Manitowoc BD0152A ice maker, is the bin water curtain suppose to swing freely? Just wondering if the proper configuration is A) water curtain is help against and physically touching the actual bin switch with the black magnet and when it harvests the ice, the falling ice pushes the water curtain away restarting the cycle OR B) the free swinging water curtain is about 1/4 inch away (freely swinging) from the bin switch (does NOT need to be held against the bin sensor)? From what I can see I’m missing the black part of the magnet on the water curtain that suppose to touch the sensor (according to the replacement wear curtain photos i’ve seen online).

Got an SD0502A worked good so far, but for some reason it shut totally down no LED on, not
Limit LED Flashing. After ca 10 min. turns back on, bin switch LED on Water is running short before water probe get in contact machine shut down again!

QDO322a
Replaced board. Problem remains…
Sequence is fine until contactor is required…no voltage to contactor. All wires traced and verified. New toggle, wiring verified.
Anybody ever seen this?

QD0272A..ice machine is not working. When increase ice bridge sensor wire remove than it is working. If not remove then it is running for 10 minutes after it get defrosting. What to do??

I have a machine which makes ice fine the first cycle…then harvest fine also..but when the ice drops, and the curtain closes ok…it goes into prechill, and the water is filling the reservoir, it stops filling…pump starts..and goes halve way thru the first cycle and runs out of water…I have pulled the water level probe wire off the board, at the time the water shuts off…and it will not continue to fill with water. It has to be the board right???

Im working on a qm30a manitwoc. my water pump will not come on. I removed pump and tested… ran fine… tested plug for pump on the unit with a meter, and it reads zero. is this a board issue?

ok thanks lynn, yes I took it right off of the board and it still just ran for a couple of minutes and then the whole unit simply shuts down and I have to wait 3 minutes or so until it will try to start again.

@miles, if the ice machine goes into the harvest cycle, without the ice thickness control plugged in, then the control board is bad. This is assuming that it isn’t a forced harvest after 60 minutes. Are you absolutely sure you unplugged the ice thickness probe directly from the board and not just disconnected from it’s mounting point?

thanks Lynn I actually did that as well and it still shutdown after a couple minutes of running. Also the bin light did remain on. When I turn it off and on again the harvest light did flash twice but im not sure if I can reset the board?

@Rajvinder, normally no. When a control board fails the machine will usually not make any ice, not just inefficient. Efficiency is usually a symptom of a machine being dirty, too hot ambient temperature, too hot water temperature, or not enough air flow.

@Oral, anytime the water curtain is closed, the bin switch light should be on. This is the case whether it’s on/off/clean whatever. I wouldn’t trust an OHM test on an ice thickness control and I certainly wouldn’t replace a control board hoping that’s the problem. Go ahead and replace that ice thickness control first, as the IT probe is the only thing that puts that machine into harvest.

@Paul, it’s possible the contact is failing, assuming the machine is not trying to run in ‘clean’ mode. You can push in the contactor, carefully avoiding contacts, to see if the compressor starts.

@Miles, that’s way too soon to start freezing ice. I would recommend disconnecting the ice thickness control directly from the board. Turn the machine on and see if it actually continues to freeze and make a batch of ice. It should constantly freeze and never harvest, for at least 60 minutes. If it does, clean and/or replace the ice thickness control.

I have a ice maker model # QY0214A, the ice machine will start up go through the pre chill mode and start pumping water but no ice forms and the unit shuts down after about 1-2 minutes and wont restart for 3 minutes. The compressor runs fine with proper current draw and the high pressure switch also does not trip. So I am not too sure if it just a board problem shutting the system down or not?

I have a qy0454a model with a harvest issue.

When in clean mode it harvests water just fine.

When flipped to ice it runs through the purge cycle and drains any water in it just fine.

The contactor flips to intiate next sequence after the purge – a loud click comes from the contactor along with a small electric blue spark inside. However you can tell it is missing something and just reverts back to purging again shortly after and over and over they cycle goes until it just turns off.

Is the contactor bad?

Thanks!

I am working on a BD0602A,Serial#951264491. The machine will not go in to harvest even when the probe is frozen over.I did a ohm test and probe is ok, also light for bin switch stays on at all times even when toggle switch is off, light for ice probe does not come on either. Could it be the control board?

i have manitowoc ice machine-/ wondering if faulty pc board can effect compressors or make it inefficient!

@Victor, I will need more information. However, as a starting point from what you stated, start cleaning. Make sure you use a nickel safe cleaner and a soft nylon brush to scrub every cavity on the evaporator. Also remove any probes and thoroughly soak and clean.

I tell people every day, the service technicians that I work with, who are familiar with commercial ice machines, take 3-4 hours to do a thorough cleaning. It’s not something that can be ‘rushed’ through and then expect it to work.

i service manitowoc QYDUAL4G THE ICE IS IN THE COIL DONT DROP AND NOWATER COME IN

@Noel, what is the model number of your ice machine? Your inlet valve should only open when it has power, if it is not getting power, it might just be it’s not being called for. Is your water level probe light on?

@Danny, the ice thickness probe is the only thing that will initiate a harvest on that machine, unless it’s timing out at 60 minutes. I would recommend unplugging your ice thickness probe and running your ice machine. If it makes a nice slab of ice, but never harvests, then replace your ice thickness probe. However, you are right, it’s possible you also have a bin switch issue. The only way to test them is to OHM them out and look for consistency, it is possible to have a weak switch.

Lastly, if it seems to happen intermittently, you might want to check all your grounds on your machine, even back to the breaker box. Also, check your actual toggle switch, if it’s failing, it can cause your machine to malfunction as well.

water pump seems to be running ,but no power to water inlet solenoid,is it control board ? the board is 1092-110

I have a QD0212A which is clean & makes ice in approx 18 mins. The red harvest led will initiate a harvest, and the hot gas valve opens. after approx 5 seconds the hot gas valve closes and the machine goes back into freeze cycle. It then again will initiate harvest, 5 seconds, back to freeze. It will do this over & over. I have observed the green bin led and it doesn’t go out nor even blink. Any Thoughts?

@Manni, no water should enter the trough if the water level light is on. If you meant that it overfills when unplugged, then it’s operating properly. If the light comes on as soon as it’s plugged into the board, I’d recommend making sure it’s cleaned thoroughly, do not use anything abrasive as scratches will ruin the probe.

If you cannot get the probe to work and the light goes out when unplugged, simply replace the water level probe. Your part number is a 2511293 and can be found at the link below.

http://icemakerpartsshop.com/products/2511293-manitowoc-water-level-probe

Manitowac QDA0452A water level light stays on, tried unplugging and take out probe probe off the board, and then plugging back. still wtr. light stays on. water wont shut off and starts overflowing into the ice bin. any help will be appreciated.

@Julio, were you replacing the board with a new OEM control board? Also, what was the cause for the initial replacement. Manitowoc control boards fail very rarely, so I’d be inclined to look elsewhere for a problem. Either a blown fuse or a power supply issue or something in the wiring harness.

I have a manitowoc QY0894n that has no power to the LED this is the second board that has been replaced, any ideas on cause?

thanks!

@Cesar, for the amount of time it takes to clean the evaporator, I would recommend having the machine turned off. A thorough cleaning can usually take 3-4 hours for experienced technicians. It’s not a fun job and can be meticulous.

As for your refrigeration readings, gauges should be the last thing you put on an ice machine, as a last resort. Did you use stubby gauges or hoses? Chances are, if you used hoses, you’ve reduced the amount of refrigerant in the system anyway, so the reading will be incorrect. If gauges must be put on the machine, stubby gauges are recommended, due to the critical charge of the ice machine.

An SY1004A, with 80 degree Fahrenheit temps at the air condenser, suction pressure should run 75-95 PSIG. As temperature goes up around the air condenser coil, this pressure will rise.

Lynn, do I scrub the coil while the unit is in wash mode with the nickle safe cleaner running throughout and trickling down the coil or do I clean it in the off position. On a side note, the suction pressure climbs between 90-100 psi for 3.5 minutes. So I beleive that is a normal reading on a harvest mode correct? Thanks again…

@Cesar, yes scrubbing the evaporator is needed. I recommend a soft nylon brush, nothing that will scratch the plating, and small enough to fit inside the evaporator cavities. Usually a 1″ × 1″ brush from Lowes does the trick nicely. Some elbow grease is definitely needed on cleaning some ice machines where scale is a problem.

Lynn, I just recently used nickel safe cleaner. I removed several parts to scrub and cleaned them. I did not srub/clean the evaporator coil thinking that the solution mixed in the water and trickling down the evaporator coil is sufficient. What kind of brush is needed to clean the coil. Thank you for responding to my questions.

@Cesar D, the most common reason for this is that the evaporator is dirty. When was the last time you scrubbed the evaporator with nickel safe cleaner and a soft nylon brush? Even though the evaporator may look clean when wet, it needs to be dried out and you’ll probably see lots of scale or white powder in the cavities. This needs to be cleaned regularly, so that the ice can release properly.

I am working on a Manitowoc model #SY1004A. I replaced the thickness sensor and the unit can produce ice, however, when it goes into the harvest cycle the ice will not drop off of the coil. I can see that it starts to slowly pull away from the coil but ultimately it won’t drop and the next freeze cycle continues.

@Chip, this will be difficult to help with, without being in front of the machine. Can you confirm that the machine is in the freeze cycle on initial startup and not just going into an immediate harvest? If the ice thickness probe is giving problems, it might not doing it’s normal freeze.

Next, I believe those older machines had a thermistor on them that can fail, causing the problem you describe. That may need replaced or jumped out, as it is no longer used on newer machines.

Lastly, there are free service books available for download off of Manitowoc’s website, that can assist in diagnostics, complete with flow charts. You can download them at http://manitowocice.com.

I have an older JD0252A that was only putting out two cycles of ice then limiting out. Bin light goes on and off with the curtain movement, toggle switch checks out fine, power present to the circuit board. When I turn the unit on nothing happens in ice or clean mode. when I push the contractor in the compressor starts soon followed by the fan motor and the ice plate starts to get cold, nothing else. Does it sound like I need a new circuit board? What else do I need to rule out and how?
Thanks

@Eric, sounds like it might be shutting down on high head pressure. Are you sure your fan motor is running? Also ensure that your condenser and air filter are completely clean.

On a QM45 unit, the unit comes on the compressor kicks in then the water starts to flow, then 2 seconds later the unit shuts down. Any thoughts on what is acting up?

@Tim, this is a new one on me. I would recommend calling Manitowoc Service department directly and seeing what they think. I hope it’s not in the board, but this is an odd occurrence, at least for me.

Thank you, I tried 7 times, still running. I disconnected the toggle switch from the board and the pump keeps pumping in clean mode. Should I order switch? Thank you.

@Tim, it’s possible its stuck in clean mode. I would recommend cycling the toggle switch ice/off about 7 times, then leaving in the off position for about 20 seconds. Afterward, switch back to ICE mode and see if that doesn’t take it out of clean mode. If it doesn’t, then yes, it’s possible your toggle switch has failed.

Your part number is a 2301343, which can be found here: http://icemakerpartsshop.com/products/2301343-manitowoc-toggle-switch

I have a QD4052A, the machine was working fine. Now the clean light is on, and the on/off/clean switch does nothing, while the pump continues to run. Is the switch broken? How would I know? Let run for over an hour just in case.

@Bobby, are you sure you checked the OHM’s of the thermistor, as this is the typical reason for the problem you describe. I would recommend double checking the thermistor, by referencing the temperature and resistance chart in the service technicians handbook.

Below is a link to the PDF version online, the chart you need is on page 50.

http://manitowocice.com/asset/?id=smbtr

I have a Manitowoc Ice Maker Model JD0452A. The problem I am having is the is the unit quit making ice. I opened the front
and the circuit board was flashing 4 times which said the unit had unsuccessful comp cycles. I tested the compressor by
manually pressing the relay, compressor comes on and coil gets cold. I replaced the relay and the capacitor and tested still
no compressor. Unplugged unit, plugged in switched to ice water pump comes on runs through the cycle switches over but
no power to wire 58 which powers the comp relay. I have checked all the censers Ice thickness reads OHMs the thermistor
reads closed and the curtain read closed when door is closed and open when you open the door. It all leads to the circuit
board? what would be your thoughts.

Thanks

@Juan, the refrigeration system would not have anything to do with triggering harvest on that model ice machine. The ONLY thing that tells the ice machine to go into harvest is the ice thickness control or if forced into a harvest due to a long freeze cycle, which I believe is 60 minutes.

If it does not go into the harvest cycle, please replace your ice thickness control.

I have a manitowoc sy1004A that doesn’s go into harvest, replace the hpr valve, charge with the right amount of 404A

@Hans, I sent you an email the other day based off of your original contact message. That email is copied below:

Hans,

Based on the information provided, it could be any number of things. To start, we need to time the freeze and harvest cycles, this will tell us where the machine is shutting down. In addition, check the control board and check which safety limit is being indicated.

Most of the time the problem you discuss is caused by a dirty air filter or condenser, dirty ice machine where the ice forms on the evaporator, or a faulty bin switch. Remember, proper cleaning requires scrubbing the evaporator with nickel safe cleaner with a soft nylon brush. Do NOT scrape the evaporator, as this will ruin the evaporator.

Let me know what you come up with.

Thanks,
-L

I have a Maitowoc QD212A i turn it on and it runs for a while and makes ice then all of the suten it shuts down and i have to turn the switch in the off position then back in the on position can any one tell me what is going on and how i can fix this problem. Please E-Mail me HansWarren@bellsouth.net

@Cory, I don’t know your model number, but that sounds like a bin switch problem. When the ice falls, it should open the water curtain, killing the bin switch. This is the only thing that cancels the harvest cycle on most Manitowoc ice machines. Let me know your model and I’ll help you identify the right part for your older machine.

I have an older mantiwac ice machine it will cycle ice once then stay in the harvest mode. Then if I shut the machine off for a while and turn it back on it cycles ice the stays in harvest mode. The ice looks good just cycles once then stuck in harvest!!!! Please help

@Ed. This is a very peculiar problem and I’m betting we are missing a step here. Have you tried unplugging the ice thickness control from the board, then killing the power to the machine(not just switching off but unplugging)? Do this, then turn the power back on, then plug the ice thickness control back in, switch toggle to ICE.

Try this and follow the sequence of events for your machine. Is your water level light on? If it is, then try unplugging, then turning machine off then on. It’s possible you are having a water level probe problem as well.

I am working on a QD0602A machine, the ice thickness switch was faulty, ( would stay in harvest all the time ) and I replaced it. Now after the first cycle it won’t turn the pump on to fill with water, will purge but doesn’t acivate fill valve. Any thoughts?

@Hameed, there are different compressors used in this unit. The exact Amperage you are looking for can be found on the compressor serial tag or the plate on the ice machine.

is there anyone can tell me that how many amps this model’s compressor draws?
and why compressor shuts off after running for 3 to 6 minutes???
plz help someone.
thank u in advance .
hameed_hotboy@yahoo.com
model QD0212A

This blog is exactly right! my QD0212 wasn’t turning on. Repairman said it was probably the board. I checked the resistance of the bin switch with OHM meter. The switch was good but the magnet had lost it’s strength or something cause I had to remove the old magnet and taped a small round magnet in its place. I am now making ice again. The bin light led on the board also helped me diagnose the problem. light “off” means machine will not work. light “on” means magnet is working and the machine will turn on.

thanks, I am trying to repair Manitowoc ice machine, curtain does not light up bin switch Led light on the control panel ,when closed, so it suggests faulty bin reed switch. I will replace it .

@Bart, definitely. The bin switch can be intermittent, but I’m surprised it made a full bin of ice. Usually it would time out long before filling up.

Making sure the magnet is in place, not cracked, and your curtain is swinging freely would be the first things i would look at. Then yes, move on to replacing the bin switch.

Ice machine making ice but when the bin is full and the curtain is open,the machine continues to try to make ice.Could the magnetic bin switch have an intermittent problem?