Float Switch Check And Cleaning - Hoshizaki KM-350MWJ 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) Drain the water tank. Remove the base
cover, then disconnect the water tank
end of the pump tubing to drain the water
tank. See Fig. 5. After the water tank has
drained, reconnect the pump tubing.
4) Remove the top and right side panels.
5) Disconnect the 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 right side and top panels
and the base cover in their correct positions.
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 top and right side panels.
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.
14) Replace cube guide and base cover (if applicable) in their correct positions.
15) Replace the right side and top panels in their correct positions.
16) Move the control switch to the "ICE" position, then replace the front panel in its correct
position. Turn on the power supply to start the automatic icemaking process.
Legend: CB–control board; FS–float switch
Base Cover
Fig. 5
26
Disconnect This
End of Pump
Tubing to Drain
Water Tank