Hoshizaki JWE-620UA-6B service manual Float Switch Check and Cleaning, Float Switch Cleaning

D. Float Switch Check and Cleaning

If an abnormal input signal is found by “III.A. Diagnostic Procedure” or the error code “o1” or “o2” is displayed, check and clean/replace the float switch according to the procedure below.

1. Float Switch Check

To check the float switch, follow the steps below.

1)Remove the internal booster tank according to “IV.C. Removal and Replacement of Internal Booster Tank.”

2)Remove the control box cover, and disconnect the CN8 connector from the control board (see “II.D.2. Control Board Layout”).

3)To check the internal booster tank water level float switch, check for continuity across the red wires (#1 and #2) on the CN8 connector. Confirm that the float switch is open when the float is down and closed when the float is up.

4)To check the internal booster tank backup water level float switch, check for continuity across the blue wires (#3 and #4) on the CN8 connector. Confirm that the float switch is open when the float is down and closed when the float is up.

5)If any problem is found, repair or replace the float switch.

6)If the float switch is scaled up or dirty, clean it according to “2. Float Switch Cleaning.”

2. Float Switch Cleaning

Depending on local water conditions, scale may build up on the float switch. Scale on the switch can cause the float to stick. In this case, the float switch should be cleaned.

1)Remove the internal booster tank according to “IV.C. Removal and Replacement of Internal Booster Tank.”

2)Use a soft brush to remove scale or soil on the float swtich, or wipe down the float switch with a mixture of 1 part of recommended cleaner Hoshizaki “Scale Away” or “LIME-A-WAY” (Economics Laboratory, Inc.) and 25 parts of warm water.

3)Rinse the parts thoroughly with clean water.

4)If the float switch is removed, replace it in its correct position. Be careful not to confuse the positions and directions of the internal booster tank water level float switch and the internal booster tank backup water level float switch. Make sure the floats can move freely in the vertical directions (see “II.A.2. Internal Booster Tank”).

5)Replace the internal booster tank in the reverse order of the removal procedure (see “IV. C. Removal and Replacement of Internal Booster Tank”).

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