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  • T3 T4 Long Harvest

    guest created 1 month, 1 week ago 1 Member · 22 Posts
  • guest

    Member
    September 11, 2018 at 12:00 am

    New member looking for some info in regards to indigo seies model # IY0324A-161. Have had machine for little over 1 year. Wverything has been fine until past week. Continually getting T3 and T4 code as well as long harvest. Temperatures running all over the place as well. Im not a tech so any help would be appreciated. Restaurant located in a rural area and hard to get good techs out in the country. 

  • fixbear

    Member
    September 11, 2018 at 2:50 pm

    The vast majority of ice machine problems are with lack of proper cleaning.  Not seeing your installation, I do not know if you have proper water filtration .  So take a look inside at the evaporator cover and see if your water is flowing evenly across the evaporator. And if there is a mineral build up.  You will need Manitowoc ice machine cleaner to clean the machine.  It is all explained in the owners manual that I have included for you.  Also make sure to clean the condenser and air filter. 

    https://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/MAN-Indigo_iom.pdf

     

    The delta T3, T4 alarm’s saying that the drop between inlet refrigerant and tail coil is out of parameters. This can be from the lack of cleaning, or something much deeper.  Like a open thermistor or low charge. A quick check can be made with the keypad.

    SYMPTOM
    Alert icon on the display is flashing and the alert indicates
    a T1, T2, T3, or T4 Fault.
    CHECK PROCEDURE
    Press the Menu button.
    Scroll down to Service and press right arrow.
    Scroll down to Diagnostics and press right arrow
    Scroll down to Temp Sensors and press right arrow to
    display thermistor temperature readings.
    NOTE:
    An open thermistor will display -22°F (-30°C) and a
    shorted thermistor displays 475°F (246°C).
    Thermistor Test
    1.
    Disconnect thermistor from control board and
    measure resistance.
    2.
    Measure temperature at the thermistor.
    3.
    Compare measured resistance/temperature readings
    to resistance/temperature relationship chart.
    A.
    Within 10% of the published resistance value –
    Thermistor is good
    B.
    Not within 10% of the published resistance
    value – Thermistor is defective.
  • fixbear

    Member
    September 11, 2018 at 2:56 pm

    I forgot to say welcome to Techtown.  Let me know how you make out and if you need more.

  • fixbear

    Member
    September 11, 2018 at 5:25 pm

    I also forgot to mention that the machine has to be in a ambiet temp of 65 to 75F.  With the cooler weather we are seeing it may have to relearn the space it is in. To cool and it will have harvest problems.

  • mballand

    Member
    September 12, 2018 at 9:05 am

    Thank you for the info so far. Current machine temps are as follows T1 102F  T2. 189F. T3  367F. T4  124F. Looks like T3 is running very hot. I will do disconnect next and let you know. As for cleaning ive cleaned everything more then once. Ambient temp in here is usually 70-78 depending on amount of customers in dining area. I do know during cleaning when codes first appeared that coil was extra dirty. All is squeaky clean now though. Air filter curtain everything. Thanks for your time

  • fixbear

    Member
    September 12, 2018 at 11:21 am

    T3 should read about 10 F above room temp.

     

    If you have a Digital volt ohm meter, You can test out the thermister.   Disconnect power, Open the control panel. T3 is marked on the left side of the board.  It should read as per the temp the sensor part is at in the chart below.

    This is the thermocouple https://www.partstown.com/manitowoc_ice/man000013459

    And if it helps, service tech manual.https://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/MAN-Indigo_sm.pdf

     

    You mentioned rural.  I’m in the Adirondacks and 2 hours from any parts  I know what you mean.

  • mballand

    Member
    September 13, 2018 at 12:19 pm

    Looks like the T3 line got a small burn which caused it to short out must have been resting on compressor.. Thanks for the part #. Now i can order it. Rural is nice except for these times lol. 

  • guest

    Member
    August 9, 2019 at 4:04 pm

    We are also having this issue our findings are T1=91* 21.1k ohms, T2=178* 19.51 k ohms, T3= 124* 18.25k ohms, and T4=475* 7.8 k ohms. Other than the obvious T4 thermistor, do we need to change the others as well?

  • fixbear

    Member
    August 9, 2019 at 4:57 pm

    First off, not all four are used on all machines.  The controllers are used on all of the cubers but with a different software..  What model machine do you have.

  • guest

    Member
    August 9, 2019 at 7:13 pm

    We have a B570

  • fixbear

    Member
    August 9, 2019 at 8:27 pm

    That’s the bin under your ice head.  Look on the back of the machine head.  With the controler you earlier discribed it will problaby be a ID 0??? ? or something like that.

  • guest

    Member
    August 9, 2019 at 8:53 pm

    Sorry you’re right, wrong tag. IY0504A-161 is the model of the ice maker.

  • fixbear

    Member
    August 10, 2019 at 1:33 pm

    Now we know that you have a Indgo series half dice, single evaporator, sigle TXV,  500 pound, air cooled single phase machine.  Great  Now you have obviously been in the service menu to read the thermistor temps.  But the question is why?  Do you have a event code E-number?  Like E01 or E02?  Or perhaps a 1 or 2 safety shutdown?  If so, make sure to let me know what firmware version you have.

     

    Now the vast majority of ice machine problems come from a lack of proper cleaning.  With Manitowoc cleaner  Anything other will shorten the evaporator life and cause harvest problems.  Often when there is a problem a good-proper cleaning will solve it.  Troubleshooting a ice machine requires a complete evaluation of all the conditions.  After cleaning, does:

        the ice sheet form complete and even?

        Is the ice bridge about 1/8 inch thick? 

       Is the air filter clean and the condenser clean?. 

       Is the water sensor clean?

       Is the machine level both front to back and left right?

       Is the incoming water below 70F and adequate pressure?

       Is the water filter clean and in date? 

       Is the ambient air temperature below 90F?

       Is the evaporator/bin curtain fully closed and does lifting is open the reed switch?  (3rd LED at top left of board)

       Is water going down the drain from the water reservoir during the freeze cycle?

       Are water drains separate and vented?

     

    Now, the thermistor values are only valid at certain points in the cycle.  Like T3 (inlet) and T4 (outlet) are the evaporator in and out and can only become useful 5 minuet’s into the freeze cycle.  T1 is the liquid line from the condenser and should never read more than 20 degrees above ambient temp.  T2 is the compressor discharge line. and is used during harvest to make sure that the temp stay’s above 150.  On bigger machines they are different.  Gere rally the display will flash and show a triangle if you have a thermistor fault. If it shows a 476F, that means the thermistor has a short.  Usually rubbed thru or pinched somewhere. Open would be a -22F.  The other ones have to be measured with both a temp probe and a ohm-meter. They must be within 10%

     

    This is the service manual for all cubers, Make sure your reading for your model.;

    https://www.partstown.com/modelManual/MAN-Indigo_sm.pdf

  • guest

    Member
    August 12, 2019 at 12:45 pm

    Thank you for all the info. I will get this to our maintenance guy and let you know what we find out.

  • guest

    Member
    August 15, 2019 at 8:21 pm

    Aloha,

        We started looking at the codes when we noticed the warning triangle on the display. We do not have an E code showing up. Display software is REV 3.01 and main software is REV 5.002. answer to most of your other questions is yes except for water sensor does need to be cleaned. We have an order in for the cleaner and will clean the machine as soon as that arrives. Thank you for the education you are give my maintenance guy and myself on these machines. It is greatly appreciated.

    -Adam

  • olivero

    Member
    August 20, 2019 at 11:53 am

    As Fixbear mentioned above.

     

    Cleaning is crucial, I’ve had multiple machines with harvest errors where it needed to be cleaned, also one thing I find more than not is the harvest probe getting scaled up to the point that the surface is uneven, sand it or clean it and it fixes it.

     

    Had one just last week, cleaned it about a month ago, problem went away, 2 weeks later it acted up again (i forgot to clean the ice harvest probe) so I took it out and cleaned it, solved it so far.

     

    A lot of times, it’s very simple.

  • fixbear

    Member
    August 21, 2019 at 11:26 am

    olivero wrote:

     

    Cleaning is crucial, I’ve had multiple machines with harvest errors where it needed to be cleaned, also one thing I find more than not is the harvest probe getting scaled up to the point that the surface is uneven, sand it or clean it and it fixes it.

     

    Sand it?  Never ever use any abrasive on the probes.  It makes microscopic scratches that change the available surface area and thereby the sensing conductivity.  It also makes for a quicker buildup of scale deposits witch in turn requires more often cleaning and sensing problems.  Soak them for a good 10 minutes or more in Manitowoc cleaner solution. 

     

    This is what Manitowoc recommends;

  • olivero

    Member
    August 21, 2019 at 6:51 pm

    Well i’ll be darned.

     

    I never had a problem doing it that way but I guess it’s better to follow their way.

  • guest

    Member
    August 21, 2019 at 9:27 pm

    Aloha,

       We cleaned everything with the ice machine cleaner and we still have T4 showing 475. So should we replace that one. Other than that it is producing ice of pretty good quality and consistency. It did take a day to get back to making quality ice again. We still do have that fault triangle symbol but no e codes as of yet. We are on the Big Island of Hawaii and refrigeration techs are either crazy expensive, un-reliable and/or not that good at most machines. Your advice and this site in general are extremely beneficial to us to learn how to fix this kind of things ourselves. We are ever so grateful.

    Thanks

  • fixbear

    Member
    August 22, 2019 at 7:17 am

    The triangle does mean a thermistor fault

  • fixbear

    Member
    August 22, 2019 at 7:23 am

    Think of it like the wind is water and the probe is a flat plain. Now when it snows. the wind will keep it fairly clear.  Now we go to irregular terrain and we get drifts. That’s what one does to the probe with sandpaper.  Even a brown or green scrounge.  Blue is ok, but a toothbrush works well in the solution.

  • guest

    Member
    September 3, 2019 at 9:33 pm

    Ok so is t3 and t4 the same thermistor part number as listed above with the link. We have 2 machines showing the fault and one is T3 and other is T4.

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