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Hoshizaki KM800MRE, bad board?
Unit starts and operates properly, then randomly the board will cut power to the contactor, and re-apply power 1-30 seconds later. LED 1 still claims the compressor should have power. Slap the side of the unit and the compressor comes back on. I think it's just the relay on the board, but obviously i'll just replace the whole board.
What do ya'll think?
P.S. i checked output to the contactor with my volt meter, and voltage was zero.
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Id make sure the on/off switch was good first.
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ditto on the switch. Mani's act silly like that sometime and I believe there is a post somewhere on here about it. I read about it first and when I came upon my first machine that displayed the symptoms I knew where to look. Saved me tons of time.
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 Originally Posted by wdshea
I think it's just the relay on the board, but obviously i'll just replace the whole board.
I have had your symptoms with Hoshi board relays... it's pretty easy to replace a relay on the board if that is what it turns out to be.
Here is a video I did on this subject (total self-promotion  ).
Experience is what you have an hour after you need it.
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You still think it could be the switch even though all LED's on the board stay lit (indicating power and freeze cycle), and it will just re-energize the contactor.
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Just wanted to make sure, i know these machines pretty well, but i am by no means an expert. Thanks for the input, i'll let you know of the resolution.
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Seen it probably 4-5 times in my short 3 years of this trade. Yes it needs a new board.
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Check on/off switch first before replace , happen to me before some chef was playing with the board and left it on
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Yeah and with the new boards hoshizaki suggests installing their new style of compressor contactor. I like the fact the boards are suitable for a multitude of hoshizakis cause they can be expensive. I have not had much luck in repairing control boards on all refrigeration products never mind ice machines . Replace the board and stop slapping that gorgeous stainless exterior. Lol
Sent from my GT-P7510 using Tapatalk 2
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I had this happen on a brand new Hoshi on start-up. Luckily, its not so common where you'll see it a lot.
Every customer you take for granted today will be someone else's tomorrow.
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I would actually check the 10 wire plug in first
Make sure pin connectors are not loose.
Check for power output there
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