Manitowoc Ice FLAKE/CHIPLET QF0400 - Manual (Page 109)

Section 6 Electrical System
Part No. 80-1214-3 6-47
Component Specifications and Diagnostics
ICE/OFF/CLEAN TOGGLE SWITCH
Function
The switch is used to place the ice machine in ICE, OFF
or CLEAN mode of operation.
Specifications
Single-pole, single-throw switch. The switch is
connected into a varying low D.C. voltage circuit.
Check Procedure
NOTE: Because of a wide variation in D.C. voltage, it is
not recommended that voltage is used to check toggle
switch operation.
1. Inspect the toggle switch for correct wiring.
2. Isolate the toggle switch by disconnecting all wires
from the switch, or by disconnecting the Molex
connector from the control board.
3. Check across the toggle switch terminals using a
calibrated ohm meter. Note where the wire numbers
are connected to the switch terminals, or refer to the
wiring diagram to take proper readings.
4. Replace the toggle switch if ohm readings do not
match all three switch settings.
BIN LEVEL PROBE
Function
The bin level probe shuts off the ice machine after the
bin fills with ice.
To start ice making, the bin level probe must be open
(Bin Level light off). If the probe is closed (Bin Level light
on) when the toggle switch is moved to ICE, the control
system waits until the bin level probe opens (Bin Level
light off) before starting an ice making sequence. If the
bin level probe is disconnected from the circuit board,
the ice machine will not start. This prevents overfilling
the bin with ice.
FAILURE MODES
Bin Level Probe Open or Disconnected
The ice machine will not start and continuously flashes
the Bin Level light. Opening the bin level probe for
15 continuous seconds in the Freeze cycle will initiate an
Automatic Shut-Off sequence.
Bin Level Probe Closed or Shorted
The ice machine will not start and the Bin Level light is
energized.
Shorting the probe for 30 continuous seconds in the
Freeze cycle will initiate an Automatic Shut-Off
sequence.
CHECK PROCEDURE
Bin Level Probe Open or Disconnected
The ice machine will not start and continuously flashes
the Bin Level light.
1. Move toggle switch from OFF to ICE to OFF to ICE
to verify ice machine is not in an 8-minute lockout.
Switch Setting Terminals Ohm Reading
ICE
19-20 Closed
19-23 Open
20-23 Open
CLEAN
19-20 Open
19-23 Closed
20-23 Open
OFF
19-20 Open
19-23 Open
20-23 Open
Control Board
Bin Level Light
Cause
Off
Ice machine was in an
Automatic Shut-Off mode
(8-minute lockout).
Flashes Go to step 2.
Revised 8/2003