Manual Defrosting Procedure - Zanussi Electrolux No Frost Refrigerator Service Manual

8.5 MANUAL DEFROSTING PROCEDURE

To perform the test and the technical service, a new manual defrosting procedure has been introduced to be
carried out with cold internal temperatures (this is in order to avoid the possible opening of the thermal overload
cut-out of the defrosting heater).
To start the procedure, check that:
the electronic board is powered with the thermostat knob on ON - position 5 (or on a position between
90° and 270°);
the refrigerator door is closed.
Carry out the 3 following operations:
1. Rotate the thermostat knob to OFF position;
2. Open and close the refrigerator door for 4 times (wait at least 1 second between every opening
/closure);
3. Rotate the thermostat knob to ON position 5 (or to a position between "min" and "max");
At this point the electronic board check the thermal cut-outs all LEDs flash for 5 seconds, then if there are no
anomalies, the manual defrosting phase starts, if not, the LEDs continue to flash and the buzzer sounds (if
featured).
WARNING: since the thermostat knob is in OFF position (operation 1), there are 15 seconds to perform in the
correct sequence the other 2 operations (operation 2-3).
In case of error or incorrect execution of the operations, before performing once again the manual defrosting
procedure, it is necessary reset the standard functionality cutting the power to the appliance.
The manual defrosting phase consists of:
defrosting heater ON;
ON/OFF green LED on;
compressor and fan OFF;
In this case the electronic board performs the defrosting phase as the standard functionality and continues to
function normally.
NOFROST REFRIGERATORS WITH ELECTRONIC TIMER 28/29