Question about Freezers
My Hoshizaki KM-500mab overfills when the machine starts up and leaks water into the ice bin. The compressor kicks and and the flow of overflow stops. I have checked the float and cleaned it. Checked water inlet valve for blockage. Checked water valve and checked spring. When I opened the reservoir, water leaves the machine, but eventually gets backed up. I stuck a hose down there, water flowed good.
Water in the ice bin could be something as simple as clogged ice bin drain.
The bin is nothing more than a big insulated box
Kinder like cooler, but a drain.
Posted on Sep 28, 2020
A water drain plumbing problem? It is normal for the machine to flush itself out, of minerals. Drain attached to the machine (ice bin and machine) needs air venting. Clog should be flushed out or the plumbing design is at fault causing back pressure or debris in the line. Algea flushes out easily.
Posted on Sep 26, 2020
Too high of water pressure letting in more water then it can drain off. Try turning down the water first
Posted on Sep 22, 2020
(Quated From Hoshizaki Technical Bulletin)
An alarm code of 3 beeps
every 3 seconds means that the control board has shut
down on the 60 minute freeze cycle back up timer.
The “E” control board has a 60 minute timer that starts at
the beginning of the freeze cycle. If the float switch fails
to open and start the next harvest within 60 minutes, the
board will automatically start the harvest cycle. If this
occurs in two consecutive cycles, the control board will
shut the unit down on the manual reset, freeze cycle
back- up timer. The yellow fault LED marked “60 min.”
will illuminate. This safety is designed to help prevent a
freeze up of the evaporator.
Once you have identified the 60 minute alarm, there are
several things to check. Reset the alarm by depressing
the white reset button to the right of the fault LED’s.
This must be done with the power “ON”. Now check the
float switch to see if it is stuck in the up position. A stuck
float can occur if scale is present on the reed switch
shaft inside the housing. To check it, drain the water
reservoir, unplug the black float switch connector (K5)
from the control board and check it with an ohm meter
for a closed switch (zero ohms). If the float switch is
sticking, clean it with ice machine cleaner or replace it as
An inlet water valve which is slowly leaking by during the
freeze cycle can cause a 60 minute alarm. If the inlet
water valve is stuck wide open, it is unlikely that any ice
will form on the evaporator. Check for a slow leak by
allowing the unit to cycle into the freeze cycle and
disconnecting the hose at the outlet of the water valve. If
water leaks by during the freeze cycle, the water valve
diaphragm is likely damaged or the small diaphragm bleed
port is clogged with scale. Clean the bleed port or replace
the diaphragm or entire water valve as necessary.
(I Recommend to get a refrigeration tech for this part).
Another possibility is a refrigeration system problem. You
should use normal refrigeration diagnosis procedures to
check for one of these problems. If the thermostatic
expansion valve is not feeding properly or the refrigerant
charge is low, the evaporator will not form ice as it should
and a long freeze cycle will occur. This could also be the
result of the hot gas valve not closing completely during
the freeze cycle or if the compressor valves are weak or
inefficient. An inefficient compressor however, will
usually show up first on the KM model through a longer
than normal harvest cycle. This is because of cooler
than normal discharge gas. Use proper refrigeration
practices to repair a refrigeration system problem.
While these are not the only reasons for a 60 minute
freeze cycle, they are the most common and should be
checked to resolve a 3 beep/yellow fault LED alarm.
Posted on Apr 26, 2008
Always attempt to have Hoshizaki pumps rebuilt when possible. The parts are cheap compared to buying a new pump. Check ebay from time to time I have just started tearing units down and selling the used parts, that are still functional. Sold that pump for $75 last week
Posted on Nov 17, 2008
Remove the cover where the persons finger is and check to make sure that it is not covered with ice. Sounds like your machine iced oup and you will need to clean the coils and possibly replace the thermostat
Posted on Feb 12, 2009
sounds like there is a problem with the water in the sump escaping. Sometimes, the plastic grate under the evap plates break and pieces get stuck in the dump valve. It is a triangular piece that the pump attaches to via a hose. It is spring loaded and the pieces prevent it from seating, thus, water leaks into the drain that you will not notice. When the water level in the sump gets low enough, it goes into a harvest and drops small slivers of ice. I'd check that out first.
Hope this helps.
Posted on Feb 16, 2010
If this unit is iced up this bad, when it goes into the harvest mode, if it has hot gas defrost or electric grid, its not working, The ice will continue to build up all around the coil, flaps, everywhere there is a place for ice to build up. When you defrost it, it will continue to do this. With out service gauges to check this unit when it goes into harvest mode you are not going to find the problem. I hate telling you this, but some things you cant check without special equipment and I know you are trying to save $$$ as we all are. You will need to call a tech out to install his gauges to do the internal checks on the unit and use his electrical meter to check other componants. Please let me know and keep me posted.
Posted on Mar 19, 2010
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