13 of 61
Indesit
Company
Service Manual UK
English
ICE MAKER OPERATION - 2010 DF MODELS
To operate ensure:
•
The appliance has reached -9°C for a minimum of 2 hours.
•
Crushed ice or cubed ice mode is selected on the user control display.
•
The appliance has been on for approximately 12-24 hours at initial start up.
A. Ice Maker Circuit Module.
The ice maker has its own circuit module which controls the load, the
heater on the underside of the ice maker and ice maker solenoid valve at the base of the
appliance. (To prevent overfilling the ice maker module will only allow the ice maker solenoid valve
to open up to a maximum of 20 seconds).
B. Emitter and Receiver Sensors.
The electronic
control consists of two separate printed circuit
boards mounted on opposite sides of the
freezer liner below the ice maker. The board
mounted on the left hand side of the freezer
liner is referred to as the 'emitter board', and the
board mounted on the right hand side (mullion)
is referred to as the 'receiver board'
(Fig. 1)
.
The electronic control will periodically check to see if the ice
maker is at the home/park position. (
Fig. 2
shows the rake in
blue in the home position at the 2 o’clock position). When the
rake is at the home position the relay will de-energize removing
power from the ice maker until the next harvest of ice. When the
ice maker thermostat closes and signals the ice is ready to be
harvested, the emitter board sends out an infrared (IR) pulse.
If the path of the pulse is unobstructed to the receiver board, the phototransistor on the receiver
board will 'sense' the pulse. The control will then energise a relay, which applies power to the ice
maker. A harvest begins.
Closing the freezer door forces the emitter flap to fold
flat to the liner, allowing the IR beam to travel through
the cut out section at the top of the Ice Bucket
(Fig. 3)
.
If ice reaches this point in the bucket, the ice acts as a
barrier to the beam and prevents the IR beam hitting
the receiver sensor on the right. Note: If the door is
open the emitter flap springs open which obstructs the
IR beam travel to the receiver.
The emitter and receiver’s electronic boards control
power to the Ice Maker. These boards can also be
used for the Optics Diagnostic Mode Test
(see Page 38).
The auto test (see Page 34) will not test the ice solenoid valve, the two emitter and receiver
sensors, nor the Ice Maker itself. Refer to Pages 36 - 38 for the Optics Diagnostic Mode Test.
Ice Maker - view from behind cover
Emitter
Receiver
Fig. 1
Fig. 2
Emitter
Ice Maker Cover
Ice
Bucket
Fig. 3