Hoshizaki KM800MRE, bad board?

[wdshea]

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.

[ar_hvac_man]

Id make sure the on/off switch was good first.

[vzenuh]

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.

[baub]

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 ).

[wdshea]

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.

[codgy]

board for sure

[wdshea]

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.

[trippintl0]

Seen it probably 4-5 times in my short 3 years of this trade. Yes it needs a new board.

[jackintheboxtec]

Bad board!

[worrut]

Check on/off switch first before replace , happen to me before some chef was playing with the board and left it on

[Iceman7997]

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

[DLZ Dan]

I had this happen on a brand new Hoshi on start-up. Luckily, its not so common where you'll see it a lot.

[shaka]

I would actually check the 10 wire plug in first
Make sure pin connectors are not loose.

Check for power output there