Asko DW70.1 Service Manual page 12

COMPONeNT INFORMATION
Door switch
A micro switch detects when the door has
been opened. The program is paused and
power to certain components (motor, valves
etc.) is cut. The program continues where it
left off when the door is closed.
Overflow cut-out
The overflow cut-out comprises a float that
triggers a micro switch. This switches off the
inlet valve electrically and starts the drainage
pump. The protection remains in place even if
the main power switch is turned off.
light
The light is a 5 W/1 V halogen bulb powered
by a control unit via a micro switch. The lamp
turns on when the door is opened more than
5°. The lamp is dimmed when lit to reduce
the start current and to extend the life of the
bulb. The control unit features protective
components that limit the current to the light
in case of a short circuit or if a bulb with too
high a power rating is fitted. The bulb can be
replaced from inside the cleaning compart-
ment.
Cables
The machine is fitted with coded connectors
to prevent incorrect wiring. The cables com-
ply with the Rast .5 and Rast 5 standards.
Water softener
The water softener softens the intake water
to prevent limescale deposits on dishes and
in the machine. The ion exchange resin is
recharged by opening the salt water valve
(found on the water softener) and releasing
water saturated with salt into the ion ex-
change chamber during the main wash. The
ion exchange chamber is rinsed clean at the
end of the main wash.
A mixer valve on the water softener controls
the water passing through or bypassing the ion
exchange resin. The higher the water softener
setting, the greater the amount of water pass-
1
ing through the ion exchange resin. When the
mixer valve is open, the water bypasses the ion
exchange resin.
Some models have a sensor, a reed switch,
to detect when the salt needs refilling. Other
models use an optical indicator in the salt filling
hatch.
Air gap
On the side of the machine is an anti-back-
flow device to prevent dirty water from being
siphoned back into the water system, such
as if a vacuum develops in the water system.
Machines with a water softener also have a
water pocket that is filled with about  dl of
water. This water pocket is emptied when the
salt water valve is activated.
Thermistor
The thermistor is at the front edge of the
bottom drain and detects when the selected
water temperature has been reached. If the
thermistor is short-circuited or detaches
from the circuit board, the heating element is
turned off.
Pressure sensor
The pressure sensor is connected to the
pressure chamber in the bottom drain. It
measures the pressure, which corresponds
to the water level in the machine. If the water
level in the machine is too high (for five con-
secutive seconds) the drainage pump starts
and all other components are switched off.
When the right level is reached, the program
continues where it left off. If the level sensor
generates an output signal of <1 VDC during
the prewash (indicating a blocked filter), an
additional prewash is activated with an SCS
step.
The level sensor also controls the draining time
(can be extended from 5 seconds to a maxi-
mum of  minutes). Does not apply to DW-70.1
The sensor also checks the need to refill (such
as if a bowl fills with water). Does not apply to
DW-70.1