Float Switch Check And Cleaning; Float Switch Check - Hoshizaki KM-320MAH Service Manual

E. Float Switch Check and Cleaning
FS is used to determine that there is sufficient water in the water tank after the 1-min.
fill cycle and after each harvest cycle. FS is also used to determine that the appropriate
volume of water has been converted into ice before switching out of the freeze cycle. No
adjustment is required.

1. Float Switch Check

To check FS, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel, then move the control switch to the "OFF" position.
3) 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.
4) Remove the control box cover.
5) Disconnect FS connector from CB
K5 connector.
6) Check for continuity across FS leads. With
the water tank empty, FS should be open.
If open, continue to step 7. If closed, follow
the steps in "II.E.2. Float Switch Cleaning."
After cleaning FS, check it again. Replace if
necessary.
7) Reconnect FS connector to CB K5
connector, then replace the control box
cover in its correct position.
8) Move the control switch to the "ICE" position. Replace the front panel in its correct
position, then turn on the power supply. After 1 min., the 1-min. fill cycle should end and
the initial harvest cycle should begin. If the initial harvest cycle begins, FS is good and
the check is complete. If the initial harvest cycle does not begin, continue to step 9.
9) Turn off the power supply.
10) Remove the front panel. Move the control switch to the "OFF" position.
11) Remove the control box cover.
12) Disconnect FS connector from CB K5 connector.
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
Disconnect This
End of Pump
Tubing to Drain
Water Tank
Base Cover
34
Fig. 3