Hoshizaki KM-901MWH - Manual (Page 57)

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D. Float Switch Check and Cleaning
1. Float Switch Check
To check the float switch, follow the steps below.
1) Turn off the power supply.
2) Remove the front panel and 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. 2. After the water tank has drained, reconnect the pump tubing.
4) Remove the control box cover.
5) Disconnect the black float switch connector
from the control board BLACK K5
connector.
6) Check for continuity across the float switch
leads. With the water tank empty, the float
switch should be open. If open, continue
to step 7. If closed, follow the steps in "IV.
D.2. Float Switch Cleaning." After cleaning
the float switch, check it again. Replace if
necessary.
7) Reconnect the black float switch 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 minute, the 1-minute fill cycle should
end and the initial harvest cycle should begin. If the initial harvest cycle begins, the
float switch 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.
11) Move the control switch to the "OFF" position.
12) Remove the control box cover.
13) Disconnect the black float switch connector from the control board BLACK
K5 connector.
14) Check for continuity across the float switch leads. With the water tank full, the float
switch should be closed. If the float switch is closed and the icemaker will not switch
from the 1-minute fill cycle to the initial harvest cycle, replace the control board. See
"V.P. Removal and Replacement of Control Board."
If the float switch is open, confirm that the water tank is full. If the tank is not full, check
the water supply, water filters, and inlet water valve. If the tank is full, follow the steps in
"IV.D.2. Float Switch Cleaning." After cleaning the float switch, check it again. Replace
if necessary.
Disconnect This
End of Pump
Tubing to Drain
Water Tank
Base Cover Fig. 2