Float Switch Cleaning - Hoshizaki KM-320MAH Service Manual

13) Check for continuity across FS leads. With the water tank full, FS should be closed.
If FS is closed and the icemaker will not switch from the 1-min. fill cycle to the initial
harvest cycle, replace CB.
If FS is open, confirm that the water tank is full. If the water tank is not full, check the
water supply, water filters, and inlet water valve. If the water tank is full, follow the
steps in "II.E.2. Float Switch Cleaning." After cleaning FS, check it again. Replace if
necessary.
Legend: CB–control board; FS–float switch

2. Float Switch Cleaning

Depending on local water conditions, scale may build up on FS. Scale on the switch can
cause the float to stick. In this case, FS should be cleaned.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) Drain the water tank.
a) On KM-320M_H, KM-515M_H, KM-600M_H, KM-650M_H, and KM-901M_H,
remove the base cover, then disconnect one end of the pump tubing to drain the
water tank. See Fig. 3. After the water tank has drained, reconnect the pump tubing.
b) On KM-1340M_H and KM-1601M_H, remove the rubber cap covering the overflow
pipe in the water tank. Remove the overflow pipe by turning it counterclockwise. After
the water tank has drained, replace the overflow pipe and the rubber cap in their
correct positions. Note: Be sure the overflow pipe o-ring is in its correct position on
the overflow pipe.
4) Disconnect the vent tube and the flush tube from the top of FS, then remove FS
assembly and remove the rubber boot from the bottom of FS assembly. See Fig. 4.
5) Remove the retainer rod from the bottom of FS housing, then remove the float. Be
careful not to bend the retainer rod excessively when removing it.
6) Wipe down FS housing, shaft, float, and retainer rod with a mixture of 1 part Hoshizaki
"Scale Away" and 25 parts warm water. Clean the inside of the rubber boot and hose
with cleaning solution. Rinse the parts thoroughly with clean water.
7) Reassemble FS assembly and replace it and the rubber boot in their correct positions.
Reconnect the vent tube and the flush tube.
8) Move the control switch to the "ICE" position.
9) Replace the base cover (if applicable) and
front panel in their correct positions.
10) Turn on the power supply to start the
automatic icemaking process.
Legend: CB–control board; FS–float switch
Flush
Fig. 4
35
Vent
Shaft
Float Switch
Housing
Float
Retainer Rod
Rubber Boot
and Hose