Hoshizaki KM-901MWH, KM-901MAH, KM-901MRH/3 service manual Float Switch Check and Cleaning

Models: KM-901MRH/3 KM-901MWH KM-901MAH

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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.

Disconnect This End of Pump Tubing to Drain Water Tank

7)Reconnect the black float switch connector, then replace the control box cover in its correct position.

Base Cover

Fig. 2

 

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.

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Hoshizaki KM-901MWH, KM-901MAH, KM-901MRH/3 service manual Float Switch Check and Cleaning