KM-650MAH-E Service manual - Hoshizaki

D. Float Switch Check and Cleaning
F/S is used to determine that there is sufficient water in the water tank after the 1‐minute
fill cycle and after each harvest cycle. F/S 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 F/S, follow the steps below.
1) Remove the front panel. Move the control switch to the "OFF" position, then unplug the
icemaker from the mains socket.
2) 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.
3) Remove the control box cover.
4) Disconnect the black F/S connector from
CB K5 (black) connector.
5) Check for continuity across F/S leads. With
the water tank empty, F/S should be open.
If open, continue to step 7. If closed, follow
the steps in "IV.D.2. Float Switch Cleaning."
After cleaning F/S, check it again. Replace
if necessary.
Disconnect This
End of Pump
Tubing to Drain
Water Tank
6) Reconnect the black F/S connector, then
replace the control box cover in its correct Base Cover
Fig. 3
position.
7) Plug the icemaker back into the mains socket, then move the control switch to the "ICE"
position. Replace the front panel in its correct position. After 1 minute, the 1-minute fill
cycle should end and the initial harvest cycle should begin. If the initial harvest cycle
begins, F/S is good and the check is complete. If the initial harvest cycle does not
begin, continue to step 9.
8) Remove the front panel. Move the control switch to the "OFF" position, then unplug the
icemaker from the mains socket.
9) Remove the control box cover.
10) Disconnect the black F/S connector from CB K5 (BLACK) connector.
11) Check for continuity across F/S leads. With the water tank full, F/S should be closed. If
F/S is closed and the icemaker will not switch from the 1-minute fill cycle to the initial
harvest cycle, replace CB.
If F/S 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 "IV.D.2. Float Switch Cleaning." After cleaning F/S, check it again. Replace if
necessary.
43