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E. Float Switch
1. Explanation of Operation
The float has switches within the float switch. The lower switch (black and blue wires) is
used for low water safety protection and termination of the freeze cycle. The upper switch
(black and red wires) is not used on the KMS-750MLH.
2. Cleaning
Depending on local water conditions, scale may build up on the float, float switch shaft
and inside the housing. Scale on the float or shaft can cause the float to stick causing
erratic operation. The float switch should be cleaned and checked before replacing.
First, disconnect the black K5 float switch connector from the control board and remove
the float switch and rubber boot from the icemaker. Remove the rubber boot from the
float switch. Twist the mechanical lock at the top of the float housing and lower out the
float and float shaft. Remove the retainer clip from the shaft and slide the float off the
shaft. Soak the switch assembly in ice machine cleaner. Wipe down the shaft, float,
housing, and rubber boot with cleaning solution. See "VI. Cleaning and Maintenance
Instructions."
3. Float Switch Check Procedure
Before replacing a float switch that you suspect is bad, make sure the float switch has
been cleaned. This procedure will help you verify your diagnosis. The float switch has
three wires. The black wire is common. The blue wire is for the lower float switch contact
and the red wire is for the upper float switch contact. The upper switch is not used on the
KMS-750MLH.
1) Disconnect the black K5 float switch connector from the control board.
) Drain the reservoir water.
3) Turn the control switch to "ICE".
4) As water fills the reservoir, the lower float switch contacts should close. Check continuity
of the lower float switch contacts using the black and blue wires.
5) Turn the control switch to "OFF".
6) Drain the reservoir water.
7) As water drains, the lower float switch contacts should open. Check continuity of the
lower float switch contacts using the black and blue wires.
8) Reconnect the black K5 connector to the control board when finished.
