Manitowoc Ice QF2200 Section, Electrical System, Component Specifications and Diagnostics, 6-47

Section 6 Electrical System

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.

Switch Setting	Terminals	Ohm Reading
	19-20	Closed
ICE	19-23	Open
	20-23	Open
	19-20	Open
CLEAN	19-23	Closed
	20-23	Open
	19-20	Open
OFF
	19-23	Open
	20-23	Open

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.

Control Board	Cause
Bin Level Light
	Ice machine was in an
Off	Automatic Shut-Off mode
	(8-minute lockout).
Flashes	Go to step 2.

Part No. 80-1214-3 Revised 8/2003 6-47