Hotpoint LTF11M121OUK Service Information page 15

Indesit Company
Ozone Generator
The function of the ozone generator, is to
prevent the formation of bacteria,
consequently minimizing unpleasant smells
inside the tub and generally improving
hygiene conditions internally of the appliance.
The component receives a power input of 220
V from the mainboard. An internal electronic
circuit is programmed to govern the
components and the duration for which ozone
is produced.
When activated to deliver ozone, the solenoid
valve of the device is open, and the fan and
ozone generator come into operation.
How the Ozone Generator works as an option for preventing the proliferation of bacteria and
avoiding unpleasant smells:
The "O3" option is activated by pressing and holding the relative button. The option functions
continuously for 24 hours, alternating between ON and OFF at set intervals:
for the first three hours, the system operates 5 minutes On and 15 minutes Off, then, for a further 3
hours and 10 minutes, 8 minutes On and 30 minutes off; the time remaining until the end of 24 hours
is divided into intervals of 8 minutes On and 15 minutes Off.
When the ozone generation system is not working correctly, the solenoid valve will emit
3 audible pulses each time it is activated.
If nothing is heard when activating the function, the fault is in the solenoid valve.
Rinse Aid
The Rinse Aid Warning Light is operated by an optical sensor.
The reading is made by the user interface; this relays the information to the mainboard, which
determines whether to switch the light on or off and communicates the decision to the User Interface.
The light comes on when the door is closed, and when the Optical Sensor no longer detects the rinse
aid (about 120 seconds after empty status is detected).
If the machine is on, the warning light will go out within 2 minutes after rinse aid has been put into the
dispenser.
If the machine is off, conversely, then the next time the mainboard is powered up, the warning light will
stay off.
Note: The rinse aid is always released during the "Hot Rinse" step, once the water in the tub has
heated to around +47 °C.
All Models are factory-set to level 2, which represents a dosage of 3 cc / 3 ml.
The maximum capacity of the container is around 100 ml.
Possible settings:
0: Off (no rinse aid is released)
1. One pulse is generated, releasing 1.5 ml of rinse aid
2: Two pulses are generated, releasing 3 ml of rinse aid
3: Three pulses are generated, releasing 4.5 ml of rinse aid
4: Four pulses are generated, releasing 6 ml of rinse aid
Service Manual UK
Ozone Generator
seen from the rear of the dispenser
15 of 40
English