Electrolux W465H Service Manual page 39

Fault code 45, MOTOR NOT FOLLOW
This fault code is generated by the motor control. The motor control must
always receive information on the rotation of the motor from the tacho
sensor in order to rotate. If the tacho sensor is not working, the motor can
rotate for max. 10 seconds during the starting process. After this period,
the "MOTOR NOT FOLLOWING" fault code will be activated.
Reasons for this code being activated can be:
• Break in the cables between the tacho sensor and the motor control
• Break in connectors in tacho cables
• Break in one of the phases to the motor (cables or connectors). This
fault can be suspected if the motor does not rotate for 10 seconds (the
motor will not start with only two phases).
• Fault in tacho generator
• Fault in tacho circuits in the motor control
Further information can be obtained by studying the contents of "FC
FAULT LOGGER". Study the following:
• MOTOR NOT FOLLOWING (specifies how many times fault code 45 has
occurred)
• LAST FAULT CODE N/8 (shows the 8 latest fault codes)
• TACHO CUT-OUT LOW RPM (can give a clue in case of intermittent
faults)
• TACHO CUT-OUT HIGH RPM (can give a clue in case of intermittent
faults)
Action:
• Replace the defective part when troubleshooting is complete.
Fault code 51, CHECKSUM FROM CPU
DLCU has detected a fault in the internal communication between DLCU
and CPU. The DLCU processor will reset itself when the fault has disap-
peared.
CPU reads the fault message when the program starts and finishes and
generates a fault code, the fault message is ignored between these two
occasions.
Reason:
Strong interference from surrounding equipment etc. can cause fault co-
des.
Action:
Re-set the fault codes. If the fault codes can not be re-generated or if they
return, rectify the adjacent equipment that causes the interference. If this
does not help, try changing the CPU board, since the interference sensiti-
vity of different CPU boards can vary to some extent.
Troubleshooting
39