Question about Hoshizaki Commercial Freezer KM-500MAH

3 Answers

Hoshizaki Ice Machine Model KM-500MAF

Won't make ice,comp wont run,not running,pressure is at 73lbs. also beeps 3 times

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  • Anonymous Apr 01, 2008

    machine beep 3 time every 3 second

  • Anonymous May 31, 2008

    Cannot locate the reset button...I'm looking for the white reset but have had no luck. I am getting the 3 beeps. Is there a schematic of where the reset button is.

  • amimichele Oct 22, 2008

    Can't find the reset button, either. Moved the unit and let it settle. ???

  • Caleb Brunson
    Caleb Brunson Oct 25, 2016

    White button on board to reset alarm?? Got to take covers off find board and you cant miss it. Also for what it's worth an extended freeze can be caused by dirty condenser, dirty water distribution tubes, float switch adjusted out of whack, if outside def check condenser, condenser fan capacitor to make sure fan isn't over heating, fan cycle switch adjusted properly....

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3 Answers

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(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
necessary.
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

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  • 54 Answers

Sorry condenser, float out of whack, cond fan capacitor(fan may over heat n shut off) fan cycle switch, dirty distribution tubes, stuck float, stuck inlet water valve

Posted on Oct 25, 2016

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  • Hoshizaki Master
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3 beeps hoshizaki ice machine. long freeze cycle. txv got shut. replacing txv

Posted on Oct 24, 2015

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Have a look at the side of the evaporator; there is a probe (thermistor) attached to it that tells the control board when to initiate the harvest cycle. make sure it's clean and attached properly and doesn't need replacing. If hitting the float switch initiates the harvest cycle it sounds like you have a blocked/ scaled water tube or switch housing. take off the bottom of the switch assembly (black rubber bit) and clean through to the water chamber. run a cycle of descaler before trying again.

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