Electrolux W465H Service Manual page 37

Fault code 36, INTERLOCK HARDWARE
This fault code is generated by the motor control. The motor control must
be powered with 230V/50 Hz on the interlock input in order to drive the
motor. The interlock circuits in the motor control have been split into two
channels so that a component fault in motor control cannot give a false
confirmation that the door is locked. These two channels are checked
against each other. If this check gives an incorrect result, the "INTERLOCK
HARDWARE" fault code will be activated.
The reason for this fault code being activated can be attributed to a fault in
the interlock circuits in motor control.
Action:
• Replace motor control.
Fault code 37, LOW DC VOLTAGE
This fault code is generated by the motor control unit. The motor control
unit constantly measures the voltage over the mains input. If the voltage
is too low (= falls below a certain limit), the motor control unit will shut off
the current to the motor. Once the motor has stopped (= the tacho sensor
indicates that the motor is stationary), the motor control unit checks to see
whether the input voltage is still low. If it is, a fault code is activated: "LOW
DC VOLTAGE".
The reason for this fault code being activated can be low mains voltage or
that the machine's on/off switch has been operated in an unsuitable man-
ner. Further information can be obtained by studying the contents of "MCU
FAULT LOGGER":
• UNDERVOLTAGE 2 (specifies how many times fault code 37 has been
active)
• UNDERVOLTAGE 1 (specifies how many times the voltage has drop-
ped below the limit. The difference between undervoltage 1 and under-
voltage 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 fault codes)
Undervoltages can be registered even during normal operation. Conse-
quently, a small number of registrations need not mean that there is a fault
in the motor control.
Measure:
• Check that the supply voltage is stable and never drops below nominal
voltage - 10%.
• Check that the fuses and cables are not faulty.
• Check the supply voltage in the network cabling and at the motor con-
trol system in the machine.
Troubleshooting
37