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My experience is 98% of ice machine problems are water with a few electrical and very few refrigerant. Not to say it doesn't happen. Big problem with hoshis is the little pieces of plastic breaking off of the ice deflector and blocking the spring loaded valve open so it always dumps.
Once or twice over the years when cleaning a hoshi I left the valve open but it didn't take too long before I felt stupid and opened it. never ran across one where someone else had closed it though.
One curious thing I have experienced is if i take the float switch apart and clean it real well it never works right again. Absolutely no idea why since it is a sealed magenetic switch but it happened on a number of occasions. Now if the float valve is all nasty I replace it and eliminate that problem.

Never seen someone bypass the switch and leave it open. So does it freeze behind the plate preventing harvest then. How many cycles does it take to trash the evap running like that lol

Originally Posted by danbb

Don't they have a microswitch that won't let the machine run unless the valve is closed?

That microswitch goes bad sometimes and gets bypassed with a wire jumper. I've seen it before.

Originally Posted by youngsamuel

I decided to resurrect this thread because last night I searched this forum to find out why the Hoshi I was working on would not harvest ice soon enough (2 beep alarm). It was the water cleaning valve. It was left open so the machine would make ice but not harvest. Water would come in the inlet and run straight down the clean valve and to the trough. Thanks for the help. I closed the valve and voila she was harvesting like a champ. This comes after two days of head pounding. No one at Hoshi even suggested water as a possible problem. I changed out two txv's and a Liquid line valve

Don't they have a microswitch that won't let the machine run unless the valve is closed?

Thanks

I decided to resurrect this thread because last night I searched this forum to find out why the Hoshi I was working on would not harvest ice soon enough (2 beep alarm). It was the water cleaning valve. It was left open so the machine would make ice but not harvest. Water would come in the inlet and run straight down the clean valve and to the trough. Thanks for the help. I closed the valve and voila she was harvesting like a champ. This comes after two days of head pounding. No one at Hoshi even suggested water as a possible problem. I changed out two txv's and a Liquid line valve

True- i should be clear...

The KM cubers in question have stainless, not nickel-plated evaps.

Thanks iceman-i gotta be more specific.

Not really guys
FWIW
The tiny hoshis like scotti and mani use a plated copper evaps.
Keep the lime a way outta those

The suction line thermistor terminates at 46 degrees so check the suction line temp with a probe.
You may have a buildup of crud in between the evaporator plates and this hinders harvest. Hoshizaki uses not only hot gas bypass but water to spread out the heat to complete even harvest.
If the evap looks like this from the top...] [
then where you have to concentrate is ]here[

If this is gummed up with mung, you wont get a complete harvest.

If this is clear, make sure the thermistor is reading the correct temp and not terminating early.

Edit: And yes, all of Hoshizaki's evaps are Stainless and not coated with nickel.

When it is in harvest feel all of the suction lines at the evap. They should all be hot or at least very warm. If some of them are cold see if that is the part of the evap where the ice is sticking. Make sure you have water flow because if you don't have good water flow it isn't going to harvest.

If I recall Hoshis has nickle evaps and the Hoshi cleaner works great on them but if you use it on machines without nickle evaps it strips the plating..

Originally Posted by trippintl0

Every Hoshi I've seen has a stainless steel evaporator. They are susceptible to scale buildup though, which will cause harvest problems.

That is all I have seen. Never saw nickel plated Hosi.

Every Hoshi I've seen has a stainless steel evaporator. They are susceptible to scale buildup though, which will cause harvest problems.

I am Assuming your suction pressure is high enough to harvest, seeing that some ice harvested. I would think you may have lost the nickel coating on the Evaporator. especially if it is forever old and never been cleaned, also you may have cleaned what was left of the coating with to much acidic cleaning fluid.

As far as I know they do not make a nickel coating in a spray can.

Poor water flow over the evap during harvest will cause a pre mature defrost termination. The water line needs to be 1/2 " and no pressure drop to the unit from dirty water filters. The fresh water flowing over the evap is used to cool the plates and extend the defrost.

http://www.hoshizakiamerica.com/manu...30M_B_serv.pdf

Originally Posted by gsxrsquid

I was thinking the same thing. Mani and Hoshi are two different animals.

This reminds me of Penn and Teller
when Penn tells you how Teller is doing the trick (even in slow mo) and you still can't see the slight of hand

Didn't see a hi press reading, since u cleaned a plugged condenser the system may be under or over charged and or look at the headmaster. does the outdoor fans shut off. Imo Ur just running out of hot

Originally Posted by itsiceman

aac On a Hoshi 3 min sucks if all the ice has not fallen off yet.

For harvest cycles between the two

Mani uses HG and gravity only and sometimes air.

Hoshi uses water mainly and some HG.

IMO on a Hoshi the HG valve is there to just slam shut the txv

Manitowoc should be left out of this thread or the poor guy will be going in circles

I was thinking the same thing. Mani and Hoshi are two different animals.

aac On a Hoshi 3 min sucks if all the ice has not fallen off yet.

For harvest cycles between the two

Mani uses HG and gravity only and sometimes air.

Hoshi uses water mainly and some HG.

IMO on a Hoshi the HG valve is there to just slam shut the txv

Manitowoc should be left out of this thread or the poor guy will be going in circles

so like i was saying

3 min is a good valid harvest when u hear the crack u can hear the hotgass open pressure rise is fast. with a manotowic pressure needs to get over 50 for at full harvest. so if half the plate drops and half doesnt u can b assured the hotgas valve is bad.. unless ya pressure gets over 50... and it doesnt drop. well if u have an equal part that doesnt drop its the hotgas valve. and if u saw chipping on the plate from someone chipping ice then u need to get that person away from ur equipment... 3 words ho t gas valve. been there domne that u described it to a t as wlell as the manotowic

Originally Posted by allamericanclow

sounds like a hot gas valve failing to open.

So is it a 3 min harvest or a 15 min. harvest?
No hot gas or bad TXV would get you a long harvest.

From what I'm getting from the story it sounds like its cycling too fast thru harvest but, with out a time............

To me sounds like the suction line is getting too warm too fast and not warming the whole plate to me but with out the suction temp..........

We had a manitowoc one time do just about the same thing, and we couldn't figure out why it wasn't harvesting all of the ice- everything looked fine one it, but when it went to harvest it only harvested about half the ice on the grid. after checking it and rechecking it several times, we found out that there were little burrs on the grid where someone had chipped away at the ice with something sharp- causing some of the ice to catch on the burrs and not drop.