Fisher & Paykel DishDrawer DD603 I Service Manual | Page 14

Fisher & Paykel Dishwasher Service Manual - DishDrawer DD603 I.
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March 2004

Manual 599082

- 14 -

3.9.4

Overheat Protection

The heater plate is only activated during the wash cycles.  It is not used for drying.  The temperature is maintained
by the thermistor. If a failure occurs with the electronic control of the heater plate, overheat protection is effected by
a thermal fuse on the heater plate itself.

The thermal fuse consists of a short length of solder in series with the dropper resistor track which will melt at a
relatively low temperature, 268 – 302oC (514 – 576oF) causing the control ers power supply to go open circuit
disconnecting power to the element.

3.10 Lockring Nut
The lockring nut holds the heater plate into the base of the tub and motor housing assembly to form a watertight
seal.  It does this by compressing two large ‘O’ rings between the heater plate and tub and between the heater plate
and the motor assembly.

It has clips which hold the drain hose, fill hoses and the wiring loom in place.

Another function of the lockring nut is to support the wiring cover with three clips.

3.11 Drain Cycle
The drain pump is a self priming centrifugal pump which only pumps when the motor is rotating in the drain direction
(anti-clockwise).  It has a five bladed impellor pushed into a spline on the end of the rotor shaft.
The drain pump housing, which incorporates an inlet and outlet pipe, is welded to the motor housing, hence
captivating the motor.
The inlet pipe plugs straight into the sump and is sealed there by a small ‘O’ ring.
The outlet pipe has a non return flap valve to prevent soiled water returning to the tub.
The drain hose is an extruded blow mould hose which is routed over the link assembly and exits out of the base of
the product and is connected to a domestic drain.
The drain speed during the wash program is approx. 4200 rpm. In hardware output diagnostics test mode it is
approx. 5000 rpm. This can account for draining OK in diagnostics but not during normal operation.

3.12 Filter Plate

The filter plate is a stainless steel disk which lies below the dish rack and spray arm and completely encompasses
the base of the tub.

3.12.1 The Filter System
The tub is designed with vanes which swirl the water around and over the filter plate.  At the front of the tub, located
as part of the filter plate, is the drain filter.  Large soils collect in the drain filter and only smaller soils flow through its
micro mesh filter, eliminating re-depositing of soil during the wash. The drain filter should be regularly checked and
cleaned.

3.12.2 Removing and Cleaning the Filter Plate
The drain filter can be emptied with the dish rack in place by removing the cutlery basket and opening the plastic
section of the dish rack.  The filter plate is removable for cleaning by removing the dish rack and spray arm and
unlocking the lockring nut anti-clockwise.

3.13 Drying Cycle
Immediately after water from the final hot rinse has been drained from the tub, the drying system begins operation.

The drying fan draws air through from the vent in the rear of the tub, where it absorbs water from the dish load.  The
moisture laden air is then mixed with a larger quantity of ambient air (from the kitchen), to minimise the amount of
vapour visible when exiting from bottom of the drawer front.

 

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