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21:8 HIGH DC VOLTAGE
This error code is generated by the MCU. The MCU constantly measures the voltage over the
mains input. If the voltage is too high (= exceeds a certain limit), the MCU will shut off the current to
the motor. Once the motor has stopped (= the tacho sensor indicates that the motor is stationary),
the MCU checks to see whether the input voltage is still high. If it is, this error code is activated.
The reason for this error code being activated can be high mains voltage (e.g. power surge).
Further information can be obtained by studying the contents of ”FC FAULT LOGGER”:
• OVERVOLTAGE 2 (specifies how many times this error code has been active)
• OVERVOLTAGE 1 (specifies how many times the voltage limit has been exceeded. The
difference between overvoltage 1 and overvoltage 2 gives the number of times overvoltage 1 has
occurred without it being confirmed when the motor has stopped).
• LAST FAULT CODE N/8 (shows the 8 latest error codes). Overvoltage registrations can also
occur if there is a bad contact in the tacho signal. Check also the following registers:
TACHO CUT-OUT LOW RPM (number of short tacho interruptions during wash rpm).
TACHO CUT-OUT HIGH RPM (number of short tacho interruptions during extraction rpm).
Action
• Check the tacho cables if there are many registrations in the TACHO CUT-OUT registers.
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.
Cause
• 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 ”FC ERROR LOGGER”. 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 CUT-OUT LOW RPM (can give a clue in case of intermittent errors).
• TACHO CUT-OUT HIGH RPM (can give a clue in case of intermittent errors).
Action
• Replace the defective part.
Summary of Contents for W555H
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