POOR WASH RESULTS
|
A. Food
or Starch Remains on crockery.
May be detected by running the tip
of a finger over the surface of a dish or by wiping with iodine. This gives
a blue / black colour to even the smallest trace of starch . Dried on starch
or food soil should be washed off manually before placing items back into
the dishwasher. The possible reasons for starch build up are as follows.
|
| 1.
Redepostition of soiling |
Usually
resulting from infrequent or insufficient cleaning of the mesh filter.
Partial blockage of the filter prevents the dirty wash water from being
completely drained away and , as a result, there will be a certain carry-over
of soiling into the rinses. This problem can usually be remedied by removing
the filter after each wash and brushing it clean under running water (simply
flushing the filter under the tap is NOT sufficient). |
| 2.
Inefficient Soil Removal |
Dishwashing
detergents (when used in accordance with the manufacturers instructions)
are normally capable of removing all food residue very efficiently. Under
certain circumstances, however, it can be difficult to remove soils, especially
starch. |
| |
The
Starch molecule is composed of two parts; a water-soluble "end", sugar
and water insoluble "end" (cellulosic). Normally, the starch attaches itself
to plates ( etc.) Via the water before the wash (either during a Rinse
and Hold Programme or pre-wash without detergent,) the starch tends to
line up with the water insoluble "end" attached to the plate . This type
of soiling then becomes extremely difficult to remove. The remedy is very
simple: |
| |
(a)
Avoid Pre-rinsing crockery which is heavily soiled with starch residue;
custard, grave, potatoes, rice, etc. |
| |
(b)
Always use dishwashing products during the pre wash, by placing 15cc of
detergent on the inner door. |
| 3.
Food
remains not removed prior to washing |
Ensure
that surplus food is removed and that heavily encrusted or burnt on remains
are pre-soaked. Ensure that Pre-wash Programme is used if soiled dishes
are being stored in the machine prior to washing |
| 4.
Spray
arm nozzle blockage |
Check
spray arm and check that the strainer is seated down correctly. |
| 5.
Deposits
on cups and glasses |
Deposits
of a sandy like substance etc., in the cups and glasses in the upper section
of the basket which looks like resin are generally caused by the spray
arm not functioning properly. |
| |
(5a)
Take spray arm off (look in your book on how to remove) Clean it under
a tap checking the holes are clear. |
| |
(5b)
Clean ALL the filters (look in your book on how to remove). |
| |
|
| MORE
Possible causes of spray arm inefficiency |
Loading
large or tall items in the lower basket which stops the arm revolving |
| |
Upper
spray Arm Split along seam |
| |
Upper
spray arm blocked (look at (5a) above) |
| |
Under
dosing of powder causing foam and reducing upper spray arm water. |
| |
Blocked
Strainers Reducing water to circulating pump, therefore reducing upper
spray arm water pressure. (look at (5b) above. |
| |
Low
water quantity in machine. |
| 6.
Poor
arrangement of load or over loading |
Ensure
that loading allows sufficient force of water to reach all dishes. In certain
cases it may be necessary to leave some space empty to ensure good results. |
| 7.
Blocked
Filter or kinked drain hose |
Ensure
that these items are satisfactory otherwise excess food soil will be present
in the machine. |
| 8.
Low wash temperature |
Check
that correct programme is being used and that the thermostat is operating
at the correct temperature. |
| 9.
Insufficient
detergent |
Food
soil may not be completely loosened and will not be kept in suspension
in the water. If in doubt, too much detergent does no harm. But too little
in the long run does. If dishes are heavily soiled add extra detergent.
Remember too little detergent causes foaming. |
