Alarm Safeties; A) Low Water Safety (1-Beep Alarm); B) Control Switch In The "Drain" Position (2-Beep Alarm); C) High Pressure Switch (3 & 4-Beep Alarms) - Hoshizaki FD-1001MLH(-C) Service Manual

3. Alarm Safeties

a) Low Water Safety (1-beep alarm)

(1) Fill Cycle: If upper float switch remains open 90 seconds after the inlet water valve
has energized, the control board sounds a 1-beep alarm every 5 seconds. The alarm
resets and the icemaker automatically starts running again once water is restored or
the float switch is cleaned or replaced.
(2) Freeze Cycle/Refill: If upper float switch remains open 90 seconds after the inlet
water valve energizes, the compressor de-energizes and the control board sounds a
1-beep alarm every 5 seconds. The gear motor continues for another 90 seconds to
clear the ice from the evaporator. The inlet water valve and 1-beep alarm continue
until the upper float switch closes. The alarm resets and the icemaker automatically
starts running again when the upper float switch closes.

b) Control Switch in the "DRAIN" Position (2-beep alarm)

When the control switch is left in the "DRAIN" position longer than 15 minutes, the
control board sounds a 2-beep alarm every 5 seconds. When the control switch is
moved to the "ICE" position, the alarm resets and the icemaker starts running again.
c) High Pressure Switch (3 & 4-beep alarms)
(1) 3-beep alarm: For the first and second high pressure switch activation in 1 hour,
the icemaker shuts down and the control board sounds a 3-beep alarm every
5 seconds. When the high pressure switch closes, the alarm resets and the icemaker
automatically starts running again.
(2) 4-beep alarm: For the third high pressure switch activation in 1 hour, the icemaker
shuts down and the control board sounds a 4-beep alarm every 5 seconds. This
alarm is to prevent catastrophic failure to the compressor and requires a manual
reset. Before resetting, contact your local Hoshizaki Service Representative. Turn the
power off and then on again to reset the alarm. If the high pressure switch has reset,
the icemaker starts running again.

d) Freeze Timer (5-beep alarm)

The control board starts a 30-minute freeze timer once the upper float switch closes. As
the water level drops in the reservoir, the upper float switch opens. Should the upper
float switch fail to close again before the 30-minute freeze timer terminates, the control
board sounds a 5-beep alarm every 5 seconds. This alarm requires a manual reset.
Turn the power off and then on again to reset the alarm. The icemaker starts running.
Also, when the lower float switch is open and the upper float switch is closed, the control
board sounds a 5-beep alarm every 5 seconds. This alarm requires a manual reset.
Turn the power off and then on again to reset the alarm. For further details, see "IV.E.
Float Switch Check."

e) Low Voltage (6-beep alarm)

The minimum allowable power supply voltage of this icemaker is limited by the low
voltage cut-out. When low voltage (92Vac ±5% or less) is present, the "POWER OK"
LED turns off and the control board shuts down the unit and sounds a 6-beep alarm
every 5 seconds. When the proper supply voltage resumes, the icemaker automatically
starts running again.
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