Electrolux T5675 Service Manual page 146

Troubleshooting
146
21:12 NO PARAMET. SET IN MCU
This error code is generated by the MCU for drum motor.
The MCU contains several different parameter sets for different motors. During power up the control
system checks that the correct parameter set digit is written into the MCU. If not, the control system
will write down the parameter set digit defined in fixed configuration.
If the MCU discovers that no parameter set value is written down into the MCU, the error code
will be shown.
Possible causes:
This can be caused by wrong software in CPU or wrong MCU for the current machine.
Recommended actions:
1. Make sure correct machine software and correct MCU are used.
21:13 UNBALANCE
This error code is generated by the MCU for drum motor.
The MCU monitors the unbalance switch status. If the status is active already at program start, this
error code is shown.
21:15 MOTOR NOT FOLLOW
This error code is generated by the MCU. The MCU 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, this error
code will be activated.
Possible causes:
• Break in the cables between the tacho sensor and the MCU.
• Break in connectors in tacho cables.
• Break in one of the phases to the motor (cables or connectors). This error can be suspected if
the motor does not rotate for 10 seconds (the motor will not start with only two phases).
• Error in tacho generator.
• Error in tacho circuits in the MCU.
Further information can be obtained by studying the contents of MCU ERROR LOG 1 and MCU
ERROR LOG 2. Study the following:
• MOTOR NOT FOLLOW (specifies how many times this error code has occurred).
• LAST ERROR CODE N/8 (shows the 8 latest error codes).
• TACHO ERROR LOW SPEED (can give a clue in case of intermittent errors).
• TACHO ERROR HIGH SPEED (can give a clue in case of intermittent errors).
Recommended actions:
1. Replace the defective part.