6
Service Manual - Dishwasher Models DDW24S, RDW24I and RDW24S
Air Gap
• The air gap is found next to
the cleaning compartment. It
comprises channels through
which the incoming water flows
into the cleaning compartment.
These channels also contain
an anti-backflow device and
the flow sensor through which
the water passes. Certain mod-
els are equipped with a water
pocket that collects water used
for the water softener (only
machines with a water soft-
ener). The air gap also works as
a channel of air taken in during
the drying phase, as well as a
pressure relief for excess air
when opening and closing the
door. If there is condensation in
the kitchen interiors, make sure
the lid is correctly fitted.
• Purpose: To prevent dirty water
from the cleaning compartment
being sucked back into the
water supply, and lead air to
and from the container.
Flowmeter
• The flow meter is fitted in
the air gap and cannot be
replaced separately. It com-
prises an impeller that is
rotated by the flow of water
from the inlet valve. The
impeller is fitted with two
magnets that affect a sensor,
a so-called reed switch. This
is connected to the control
unit via a wire and provides
the control unit with informa-
tion on the amount of water
entering the machine. In
order for the flow sensor to
function normally the incom-
ing water pressure must
be at least 2 bar (29 psi).
Output signal: 220 pulses
per liter (0.26 gallon) of
water flowing through.
Components and function description
• The following sections describe the function of the most
important components. See the
Troubleshooting
sec-
tion for fault and information codes.
CU, Control Unit
• The CU, or Control Unit, is a unit that functions as
both a control panel and a logic component. The con-
trol panel is fitted with a display and touch buttons
for selecting programs, options and Start/ Stop. The
control panel is an integrated part of the CU and can-
not be replaced separately. The logic component man-
ages functions needed for dishwashing programs and
diagnosis. The CU has an internal power supply for the
logic. In the event of a fault, the CU can diagnose a
number of components and functions and display fault
codes. To facilitate troubleshooting the service menu
includes a component diagnostics function, which acti-
vates the outputs in a particular sequence.
Accelerometer
• The control unit in models RDW24I and RDW24S con-
tains an accelerometer, a sensor that senses position
and acceleration. It controls the touch buttons and the
brightness of the light. The accelerometer turns off at
a specific angle to avoid causing a distraction when
seen from the worktop. It is calibrated when the door is
closed.
On RDW series models, if this symbol appears
on the display the door is not open enough.
Open the door until the display lights up.
Inlet Valve
• The inlet valve comprises an electromagnet and a
valve seat. It has an electrical connector that is coded
to ensure it is not mixed up. It is fitted with a filter,
which can be removed for cleaning. The filter stops par-
ticles then a flow limiter to limit the flow to a maximum
of 4 L (1 gallon)/min. It opens when the water pressure
exceeds 0.3 bar (4.3 psi) and provides full flow at about
2 bar (29 psi). It has a pressure range of 0.3 bar (4.3
psi) to 10 bar (145 psi). It is fitted to the air gap and
can be replaced from the rear of the machine.
• Purpose: To ensure that the machine is supplied with
water for the different dishwashing cycles.
Components Descriptions
Inlet Valve
Air Gap
Air gap
Interior
Flow
meter