| Refrigeration & Ice Making Topics about Walk-ins, Display cases, Ice Machines and other refrigeration equipment |
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07-28-2010, 10:16 AM
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Regular Member
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Join Date: Jul 2010
Posts: 7
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Manitowoc Puzzle
Hello all, I am relatively a newbie to the industry. Just wanted to get some help from veterans in the field.
The machine: Manitowoc QY0214A sn#020566421
The Problem: Unit will not initiate ICE or WASH cycle.
What I have checked out so far.
-Bin Switch tested OK.
-ICE /WASH toggle switch tested OK.
-Grounding tested
-Power is getting to all components that is need for ice making opperation.
If I manually intitiate the relay the system boot up and the cycle begin. Board red LED blink 2 then swith to green. Compressor is energized and running. Hot gas solenoid then is energized. New cycle begins. At this point, the relay no longer require assitance (it is energized and stay in contact). Ice cycle is fine (about 30-25 min. ice making with 1.5 min harvest). Ice drop and the cycle continue without a problem. Cycles will continue to repeat. All indicator seem fine amps, time windows, and temp of all componets.
On wash cycle, the relay will not stay energized (as on would expect in a wash cycle).
Is this a board related problem? If board is the culpit, would it effect the ice making cycles? Is this a tipical failure? I do not want to replace the board unless I am sure of it.
Thanks for your help in advance.
Last edited by Linhster; 07-28-2010 at 05:01 PM.
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07-28-2010, 05:34 PM
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Educational Committee
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Join Date: Jul 2000
Location: Treasure Coast/Florida
Posts: 7,126
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What "relay" did you manually initiate? Was it the compressor contactor?
I suspect the "ice/off/clean" toggle switch. I've replaced quite a few and many of them had tested OK...but changing them solved the problem.
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07-28-2010, 05:43 PM
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Regular Member
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Join Date: Jul 2010
Posts: 7
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Thanks icemeister for replying. The relay mentioned is the compressor contact. When you test these switches, do they pass the continuety test?
If they do pass, should I change them anyway? Do they have a special restistor that produce a certain range of desire ohms?
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07-28-2010, 05:59 PM
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Educational Committee
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Join Date: Jul 2000
Location: Treasure Coast/Florida
Posts: 7,126
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There's no resistors involved that I'm aware of....it's just a switch.
Most switch failures I've seen have been intermittent, which may explain why they ohm out OK, but still cause operational problems.
I always stock a new one on the truck. They're relatively cheap, so I slap it in and if it works I'm outa there.
I miss the old G-Series and previous. Those had line voltage toggles that literally fried when they went bad. No questions with those. 
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07-28-2010, 06:56 PM
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Regular Member
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Join Date: Jul 2010
Posts: 7
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Quote:
Originally Posted by icemeister
Most switch failures I've seen have been intermittent, which may explain why they ohm out OK, but still cause operational problems.
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Thanks Icemeister, I will try that.
If that does not work, do you have any more ideas on the possible gremlins?
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07-28-2010, 07:16 PM
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Professional Member
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Join Date: Jul 2010
Location: Palmdale, Ca
Posts: 68
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You might have other problems also. Your freeze time seems a little long it should be around 14 min, with 25 or 30 min it must be dropping a thick sheet of ice. What is your suction pressure at start of freeze and just before defrost?
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07-28-2010, 07:26 PM
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Regular Member
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Join Date: Jul 2010
Posts: 7
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jackintheboxtec, It's quite warm here in the east coast. Today, it is 95 here with high humidity. This unit is not in a climate control area. Also had the cover open to watch the waterflow and ice formation. Thanks for the tip.
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08-01-2010, 03:53 PM
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Regular Member
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Join Date: Jul 2010
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Replaced the switch. That was not it. Any other ideas before I switch out the control board?
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08-01-2010, 05:02 PM
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Educational Committee
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Join Date: Jul 2000
Location: Treasure Coast/Florida
Posts: 7,126
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Well...
The next thing I would do is jump out the bin switch wire from the control board (Wire #63, I think) to ground. Then switch the machine on to see if it starts.
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08-01-2010, 06:08 PM
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Regular Member
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Join Date: Jul 2010
Posts: 7
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Quote:
Originally Posted by icemeister
Well...
The next thing I would do is jump out the bin switch wire from the control board (Wire #63, I think) to ground. Then switch the machine on to see if it starts.
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Do I disconnect the red lead to the sensor or do I leave that in place and ground it with the sensor in?
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08-01-2010, 06:24 PM
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Educational Committee
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Join Date: Jul 2000
Location: Treasure Coast/Florida
Posts: 7,126
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Quote:
Originally Posted by Linhster
Do I disconnect the red lead to the sensor or do I leave that in place and ground it with the sensor in?
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Yes, disconnect from the switch leads and jump direct to ground with #63.
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08-01-2010, 08:01 PM
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Regular Member
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Join Date: Jul 2010
Posts: 7
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Grounding the bin switch (the bin connection on the board) did not get her started. I guess the board is next on the list.
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08-02-2010, 01:08 PM
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Professional Member
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Join Date: May 2008
Location: NJ
Posts: 23
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The ice making is too long. Usually it only takes 12-15 mins. When you're doing it, do you have the water curtain ON it? I usually put it back and put the door back with one screw. If you don't have the manual with that unit, go at the Manitowoc site. It will give you steps on how to check the board. And other trouble shooting hint too.
On some unit that I worked on, I replaced the boards that give intermitent problems after going through the manual. Hope this help.
Please come back and let us know what you find...
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