Electrolux W4105N, Service Manual

Page: 35 / 122

35
Troubleshooting
Fault code 33, NO INTERLOCK
This fault code is generated by the motor control. The motor control must
be powered with 230V/50 Hz on the interlock input in order to drive the
motor. This signal is confirmation that the door is closed and locked. Mo-
tor control receives its commands to rotate the drum from the timer via a
serial communication link between the motor control and timer. Since the
timer also has access to the interlock signal, the timer must never send a
run command to the motor control if the interlock signal is missing. If this
does happen, the ”No interlock” fault code will be activated.
The cause of this fault code being activated can be e.g. a break in the
cable leading the interlock signal to the motor control. There may also be
a fault in the connector in the door lock, which connects 230V/50Hz to the
interlock signal. A fault in the interlock circuits of the motor control can
also set this fault code.
Actions:
• Use a measuring instrument to check that the interlock signal comes on
X302:1-2 when the door lock is activated. Read also bit 1 in the second
bye under ”Motor Status” in the service program (the bits are numbered
from 0 to 7 where bit 0 is on the far right). If bit 1 in the second byte is 1
then the lock is open, while a 0 indicates that the lock is closed.
• Replace the defective part when it has been located.