G) Bin Control; Bin Control Troubleshooting; A) Machine Will Not Start; B) Machine Will Not Shut Off - Hoshizaki KM-251BAH Service Manual

g) Bin Control

This machine uses a lever-actuated proximity switch (mechanical bin control) to control
the ice level in the storage bin. No adjustment is required.
(1) Explanation of Operation
The bin control is connected to the K4 connector on the control board. When the bin
control is calling for ice (proximity switch closed; green LED, BC CLOSED, on), the
control board continues icemaking operations. When the bin control is activated in the
bin full position (proximity switch open; yellow LED, BC OPEN, on), the control board
shuts down the unit. However, to prevent incomplete batches of ice from forming on the
evaporator, the control board will only shut down the machine within the first 5 minutes of
the freeze cycle. If ice pushes the lever in after the first five minutes of the freeze cycle,
the control board will allow the machine to complete the freeze cycle and the following
harvest cycle before shutting down the machine.

4. Bin Control Troubleshooting

a) Machine Will Not Start

1) Confirm that the bin is not full. On the control board, if the yellow LED, BC OPEN, is
on, the bin control is the likely problem. If the green LED, BC CLOSED, is on, the bin
control is properly calling for ice. In this case, refer to section "IV. Service Diagnosis" to
verify that non-bin control related issues are resolved.
2) Check to make sure shipping tape has been removed and the wires are connected
properly.
3) Check to make sure no obstruction prevents the lever from moving to the bin empty
position.
4) Check proximity switch continuity to make sure it is not stuck open.

b) Machine Will Not Shut Off

1) Confirm that the bin is full and the actuator is in the bin full position. On the control
board, if the green LED, BC CLOSED is on, the bin control is the likely problem. If the
yellow LED, BC OPEN, is on, the bin control is properly showing that the bin is full. In
this case, refer to section "IV. Service Diagnosis" to verify that non-bin control related
issues are resolved.
2) Check to make sure no obstruction prevents the lever from moving to the bin full
position.

5. Float Switch Troubleshooting

Depending on local water conditions, scale may build up on the float switch. Scale on the
switch can cause the floats to stick. In this case, the float switch should be cleaned and
checked.
First, remove the switch from the water tank. Soak the switch assembly in ice machine
cleaner. While not necessary, the floats can be removed from the shaft during cleaning. If
you remove them, note that the blue float is on top. The floats must be installed with the
magnets inside them towards the top of the switch. Installing the floats upside down will
affect the timing of the float switch operation. Once clean, rinse and wipe the cleaner off.
Next, check the switch with an ohm meter. This float switch has three wires (the black
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