Electrolux W465H Service Manual page 42

42
Fault code 56, SET SPEED DOOR OPEN
DLCU counts the tacho pulses from the motor in order to guarantee that
the drum is stationary when the door is opened. To ensure that the signal
from the tacho generator is working correctly, DLCU compares the tacho
signal to a default value from the CPU processor, which is due to the CPU
having activated the motor.
If the default value is on when the door lock is unlocked, a fault message
will be sent to CPU.
The DLCU processor will reset itself when the fault has disappeared.
CPU reads the fault message when the program finishes and generates a
fault code, the fault message is ignored between these two occasions.
Reason:
The fault can be caused by cross talk in circuits in the CPU, or caused by
damaged components in the CPU.
Action:
If the fault returns after a reset, change the CPU.
Fault code 58, SET SIGNAL NO TACHO
DLCU counts the tacho pulses from the motor in order to guarantee that
the drum is stationary when the door is opened. To ensure that the signal
from the tacho generator is working correctly, DLCU compares the tacho
signal to a default value from the CPU processor, which is due to the CPU
having activated the motor. The tacho signal should always correspond
to the default value and if the tacho signal is not present when the default
value is present, a fault message will be generated to CPU.
The fault message is filtered in such a way that the default value should
have been on for 2 seconds; if this is the case, a check is made that the
pulses from the tacho sensor are present when the default value ceases.
The DLCU processor will reset itself when the fault has disappeared.
CPU reads the fault message when the program finishes and generates a
fault code, the fault message is ignored between these two occasions.
Reason:
• The fault can be caused by breaks in the circuits for the tacho sensor,
or caused by a fault in the magnet in the tacho sensor.
• Collateral damage due to a fault in the motor system.
Action:
• If there is no fault in the tacho sensor or the motor system, and the fault
returns after a reset, change the CPU.
Troubleshooting