Hoshizaki KM-320MAH, MWH KM-515MAH, MRH/3, MRH KM-901MAH E. Float Switch Check and Cleaning

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.

Disconnect This

End of Pump

Tubing to Drain

Water Tank

Base Cover Fig. 3

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

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