31
Freezer fan operation during and after a de-
frosting
After a defrosting, the fan in the freezer is not start-
ed until the temperature on the cooling surfaces be-
comes colder than the air temperature in the freezer.
Note: The warning “Er 02” on the front display panel
indicates that the fan in the freezer is blocked (by ice
probably). As soon as the fan can move again, this
message disappears. The fan has to be blocked for at
least one hour before this message is shown. When
the fan is “OK” it will only be a delay of about one
minute before the message is cleared.
The fan in the freezer is stopped during defrosting
of the freezer cooling plate, but it is started for short
periods of time for testing and to prevent it from being
blocked (Test and Rinse). A permanently blocked fan
will display a message “Er 02” on the front display
panel. This message is also shown if the fan is per-
manently blocked during normal thermostatic opera-
tion.
Power breaks during a defrosting
If the 12 volt DC supply is removed for short periods
of time or if the refrigerator is switched “OFF” and then
“ON” again during an automatic defrost, the defrosting
will continue from the point where it was interrupted.
However, if power has been “OFF” for more than one
hour, the remaining part of the defrost is skipped.
Cancelling of an automatically initiated de-
frosting
If, for some reason an automatically initiated defrost-
ing needs to be cancelled, enter the “Service mode”.
Then switch the refrigerator “OFF” and then “ON”
again. This cancelling will not work immediately af-
ter the defrosting is initiated at 1:00 AM. Wait at least
three minutes before trying to cancel the defrosting.
10.3 Manual Defrosting
A manually initiated defrosting will start if the AUTO/
STORE button is held down during “power up”. However,
on some models, if the freezer door is open during this
initiation, a drying up period is instead started. A manually
initiated defrosting is identical to an automatically initiated
defrosting with the exception that the defrosting sequence
starts immediately with the “relaxing period”, that is with-
out any initial temperature “pull down” period. A manually
initiated defrosting may be cancelled at any time just by
switching the refrigerator “OFF” and then “ON” by means
of the ON/OFF button. However, a short 12 volt DC power
break will not cancel the defrosting.
10.4 Drying Function
When the NDA/NDE 1402 refrigerator is to be off for some
time, the compartments must have a chance to dry up to
prevent mold from forming. The doors should then be left
open. However, the cooling surfaces in the freezer will
dry very slowly as they are well encapsulated and the air
convection is small. Therefore the refrigerator has a fea-
ture that can speed up the drying of the freezer. To initiate
this drying function, start the refrigerator with the AUTO/
STORE button held down and the freezer door open. If
required, the drying function starts with a defrosting. The
drying period will take about 3 hours (longer if a defrosting
is rst performed). Afterwards the refrigerator is automati-
cally switched off. The drying function may be terminated
by switching off the refrigerator or by closing the freezer
door.
10.5 Freezer Defrost Heating Element
The freezer heating element is a coated heat lm, taped
to the back side of the cooling ange. This ange is not
visible when opening the freezer door. It is enclosed be-
hind a cover mounted to the upper right hand side of the
freezer. During the cooling cycle, as the plate gets cold
the chilled air is directed into an air channel and pulled
to the lower section of the freezer by the fan assembly.
During defrosting, the heater will provide 70 watts of heat
to melt the ice or frost that has accumulated on the cool-
ing ange. To check the resistance of the freezer heating
element, remove the cover of the main control board on
the back of the refrigerator. Remove the red wire from
terminal (J5). Measure the resistance between this wire
and ground (-). The resistance reading should be 2 Ohm’s
+/- 10%. The resistance can also be checked at the inter-
connection box along the back wall behind the icemaker
assembly. The refrigerator should be defrosted prior to this
test to avoid erroneous readings. Frost/Ice could conduct
current hiding an open circuit in the heater. A faulty heater
may display an error code on the front display panel. See
section 11 for trouble shooting error codes.
Another test would be to check the amp draw. A simple
method is to remove the wires from the thermo fuse and
place a meter inline. Enter the service mode, and proceed
to test #8. The amp draw should be 5.8 +/- 10%.
NOTE: The interior light must be off when performing
this test as to avoid a false value of the actual amp draw
of the heater.
NOTE: Not all NDA/NDE 1402 models will have this fea-
ture.
To Next Page
Loading...
