Electrolux W4400H Service Manual page 59

INTERLOCK
The motor controller indicates an error in the interlock receiving
circuit.
If the power is on, be very careful when working on the machine.
Switch off the machine for at least 0 seconds to ensure the motor con-
troller has been completely reset. Then try to start the machine again.
Fault in MCU receiving circuitry for lock acknowledgement signal.
The test of the MCU-interlock circuits proceeds in the following way:
Before the locking of the door lock a speed command is sent from the
timer to the MCU (=0 Hz). Then the timer checks that the value of the
apparent current (ru 15) and output (ru 20) is below the value 5, which is
a condition for locking the door. When the door is locked the timer again
command running at 0 Hz and this time the apparent current and the out-
put voltage shall have a value above 5.
Troubleshooting
59