Manitowoc Indigo Intermittent Evaporator Ice Plate Freeze

[nrowey]

I have an intermittent issue with an Indigo I1000N remote an intermittent issue where the Ice Plate freezes over, Customer called explained what was happening so My first thought was to replace the ITP brought one with me replace and set to Factory 9/32 gap. system had many codes E19, E20,E02, E23, E24, C31, E11, E07,E38 one being the ITP cleared codes reset board to Factory Spec watched machine complete 4 cycles aprox 12 min each. no codes looked good.
Next day customer called same issue. Codes Found E23, E11, E07. Called support they focused on the T3 and T4 temp Sensors , I replaced both sensors reset and cleared board again , Checked System running pressure for 2 hrs seemed to be text book from PreChill thru Harvest- for 80 deg day. system completed 14 cycles just under 12 mins each. Did not make it 24 hrs. customer called frozen solid again Codes this time E02, E11, E19,E20, E31, E38.. Ready to replace board.??? or maybe give support another call. Anyone work on these units frequently with any thoughts. I am out of ideas..

[itsiceman]

Bin switch...?
Go under data log and look for a super short minimum harvest.

[nrowey]

No Bin Switch on system.
I will take a look at data log for this , but as I was monitoring once IPT was satisfied harvest completed at just under 60 sec every time.

[itsiceman]

Curtian switch damper switch bin switch what ever magnetic switch you got there that knows when the ice dropped or not. If it thinks it dropped but didn't you go into the next freeze cycle and get a freeze up.

[nrowey]

It would only be the curtain switch. Something else I noticed when on site system running and plate completely frozen over is that the IPT completely covered in ice was not satisfied , is this locked out for a period of time.? Makes sense what you are telling me...

[TPARSONS64]

Bad board...or thats what I was taught by the best at Manitowoc....but that was on the older machines. Don't have a ton of training or experience on Indigo models

Tim Parsons

[TPARSONS64]

Call tech support and ask for Barry Hett or Tom Lee.....thats who I talked to when I worked on and represented Manitowoc....I don't know if they are still there....

Tim Parsons

[nrowey]

I was going down that road on the control board, but I will try itsiceman's theory and replace the $40.00 curtain switch.. itsiceman lead me to there was a way to see the history showing the time of the harvest cycle does anyone know how to recall this info. does it need to be downloaded to a USB to see detail history? or am i misunderstanding his response..

[itsiceman]

Pick the date it failed and it gives a summary of that day. All from the display.

[itsiceman]

Water probe and wire harness can ice you up too

[TPARSONS64]

Well....a weak bin switch won't cause it to not harvest but can make double slabs. But sure....why not...it's cheaper for sure

Tim Parsons

[TPARSONS64]

I don't think you need to download it. I think he is correct. It should be in the history of the controller.

Tim Parsons

[TPARSONS64]

Now that I am thinking about it, a bad board will be an extended freeze time....a bad bin switch would go off on an extended harvest time code.

Tim Parsons

[itsiceman]

Or the ice probe you put in sucks too. It has happened.
If you can update the firmware with a usb you probably won't hear from it again.

[itsiceman]

Wouldn't keep part changing. Could be hot gas valves or low on charge. Probably half a dozen other things too.

[davejohnsonnola]

Tommy Lee is still with Manitowoc.

We had similar on a warranty machine, it was the harness to the microphone.
If your HZ readings look wonky, you'll want to change the harness any time you change the microphone.

[itsiceman]

There is no wire harness on the ice probe. Also the machine display only shows two frequencies but the board reads a handful of other frequencies that could initiate harvest as well.

[nrowey]

Here is the Data History:

I left the site at 5:00 PM on 8/16 all looked good: Readings from History 8/16 -
Min Freeze 9:34PM Len = 6:02
Max Freeze 3:24PM Len = 10:29
Min Harvest 6:15PM Len = 0:57
Max Harvest 10:53PM Len = 3:28
Max Delta T3T4 = Delta = 4 T3 = 21 T4 =25
Runtime 08:47
Ice Prod = 0302
POT W3te00060
Cycle Cn00045
Cln Cycl00000

Below is the data from the 17th I arrived to the same problem around 5:00PM

Min Freeze 2:26AM Len 6:01
Max Freeze 2:16AM Len = 60.01 (problem)
Min Harvest 12:31PM Len = 1:10
Max Harvest 3:13AM Len = 3:30
Max Delta T3T4 = Delta = 9 T3 = -8 T4 = -17
Runtime 12:03
Ice Prod = 0275
POT Wate00054
Cycle Cn00041
Cln Cycle00000

[nrowey]

I also did a Tap Test on The ITP all passed.

[davejohnsonnola]

There is no wire harness on the ice probe. Also the machine display only shows two frequencies but the board reads a handful of other frequencies that could initiate harvest as well.

Sorry misspoke... the harness that was warranteed was for the water probe.