Electrolux T5675 Service Manual page 145

21:7 LOW DC VOLTAGE
This error code is generated by the MCU for drum motor.
The MCU constantly measures the voltage over the mains input. If the voltage is below a predefined
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 low.
If it is, this error code is shown. The reason for this error code being activated can be low mains
voltage or that the machine's on/off switch has been operated in an unsuitable manner.
Further information can be obtained by studying the contents of MCU ERROR LOG 1 and MCU
ERROR LOG 2:
• UNDERVOLTAGE 2 (specifies how many times this error code has been active).
• UNDERVOLTAGE 1 (specifies how many times the voltage has dropped below the limit. The
difference between undervoltage 1 and undervoltage 2 indicates how many times there has been
an undervoltage 1 without it being confirmed when the motor has stopped).
• LAST FAULT CODE N/8 (shows the 8 latest error codes) Undervoltages can be registered
even during normal operation. Consequently, a small number of registrations need not mean
that there is an error in the MCU.
Recommended actions:
1. Check that the supply voltage is stable and never drops below nominal voltage - 10%.
2. Check the fuses and cables.
3. Check the supply voltage in the network cabling and at the MCU in the machine.
21:8 HIGH DC VOLTAGE
This error code is generated by the MCU for drum motor.
The MCU constantly measures the voltage over the mains input. If the voltage exceeds a predefined
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 shown.
Possible causes:
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 MCU ERROR LOG 1 and MCU
ERROR LOG 2:
• 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
ERROR LOW SPEED (number of short tacho interruptions during wash rpm). TACHO ERROR
HIGH SPEED (number of short tacho interruptions during extraction rpm).
Recommended actions:
1. Check the tacho cables if there are many registrations in the TACHO CUT-OUT registers.
Troubleshooting
145