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D. Float Switch Check and Cleaning
(for Booster Tank Water Level Float Switch and Backup Water Level Float Switch)
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 fl oat switches according to the procedure below.
1. Float Switch Check
To check the fl oat switches, follow the steps below.
1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power supplies
from being turned back on inadvertently.
2) Remove the front panel and top panel of the booster tank.
3) Remove the control box cover, and disconnect the CN8 connector from the control board
(see “II.F.2. Control Board Layout”).
4) To check the booster tank water level fl oat switch, check for continuity across the orange
and red wires (#1 and #2) on the CN8 connector. Confi rm that the fl oat switch is open
when the fl oat is down and closed when the fl oat is up.
5) To check the booster tank backup water level fl oat switch, check for continuity across the
pink and light blue wires (#3 and #4) on the CN8 connector. Confi rm that the fl oat switch
is open when the fl oat is down and closed when the fl oat is up.
6) If any problem is found, repair or replace the fl oat switch.
7) If the fl oat 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 fl oat switches. Scale on the
switches can cause the fl oats to stick. In this case, the fl oat switches should be cleaned.
1) Use the “ON/OFF” button on the operation panel to turn off the unit, then turn off the
dishwasher and booster tank power supplies. Lockout/Tagout to prevent the power supplies
from being turned back on inadvertently.
2) Remove the front panel and top panel of the booster tank.
3) Use a soft brush to remove scale or soil on the fl oat switches, or wipe down the fl oat
switches with a mixture of 1 part of Hoshizaki “Scale Away” and 25 parts of warm water.
4) Rinse the parts thoroughly with clean water.
5) If the fl oat switch is removed, replace it in its correct position. Be careful not to confuse
the positions and directions of the booster tank water level fl oat switch and the booster
tank backup water level fl oat switch. Make sure the fl oats can move freely in the vertical
directions (see “II.A.2. Booster Tank”).
6) Replace the booster tank panels.