Service Manual

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Red (R)
(upper oat switch)
Black (BK)
(common)
Blue (BU) (lower
oat switch)
Upper Float (blue)
Magnet (towards top)
Magnet (towards top)
Lower Float (white)
Plastic Retainer Clip
Spring Retainer Clip
Fig. 6
E. Float Switch Check and Cleaning
1. Float Switch Check
A dual oat switch is used to determine that there is sufficient water in the reservoir
during ll and rell. CB monitors UFS to de-energize WV when UFS closes during ll and
rell. CB monitors LFS to energize WV when LFS opens during the freeze cycle (rell).
CB monitors the time between LFS opening and UFS closing (90-sec. low water safety).
CB also monitors the time between UFS closing and LFS opening (30-min. freeze timer).
No adjustment is required.
1) Remove the front panel and move the power switch to the "OFF" position. Move the
control switch to the "DRAIN" position.
2) Move the power switch to the "ON" position.
3) Allow the water to drain from the reservoir, then move the power switch to the "OFF"
position and the control switch to the "ICE" position.
4) Disconnect the molex plug from the control box and check continuity across FS wires.
(BK) to (R) for UFS and (BK) to (BU) for LFS. See Fig.6. With the water reservoir
empty, FS switches are open. If open, continue to step 5. If closed, follow the steps in
"II.E.2. Float Switch Cleaning." After cleaning the oats, check them again. Replace if
necessary.
5) Reconnect the molex plug on the control box.
6) Move the power switch to the "ON" position and let the water reservoir ll.
7) Once the reservoir is full and GM starts, move the power switch to the "OFF" position.
8) Disconnect the molex plug from the control box and check continuity across FS wires.
(BK) to (R) for UFS and (BK) to (BU) for LFS. They should be closed. Clean or replace if
necessary.