Electrolux W465H Service Manual page 40

40
Fault code 52, CHARGE CIRCUIT
DLCU contains an arming circuit that is charged when the door lock coil is
to be activated. For safety reasons, this arming circuit must be discharged
when the door lock coil is not to be activated.
If the arming circuit for operating the door lock is charged when it is not
supposed to be, a fault message will be sent to the CPU processor. If the
fault ceases, the message will not be sent to the CPU.
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.
Cause:
• The error can have been caused by overloads and/or defective compo-
nents in the DLCU, or caused by defective components in the CPU.
Measure:
• If the error cannot be corrected, replace the CPU unit.
Fault code 53, CPU/DLCU HIGHLEVELS
The DLCU contains a mechanical level monitor which ensures that there
is no water in the machine when the lock opens. To ensure that the level
monitor functions correctly, the mechanical level monitor is compared with
a nominal value generated by the CPU, which is compared with the elec-
tronic level check.
When a program starts or terminates, a check is made to ensure that the
mechanical level monitor is switched off, and if this is not the case, a fault
code is generated.
Reason:
• The level controller can be damaged:
• Open circuit in the cables for the level controller.
• Blocked air hoses in the level controller system.
Action:
• Check the level controller function. (Switch-on level = 40 mm, switch-off
level = 15 mm Wg)
• Check the cables and their connections. The voltage across the level
controller should be 0 V when the water level is < 15 mm Wg and 5 V
when water level is > 40 mm Wg.
• Check that the level hoses are not blocked. Blow clean all the hoses in
the level system.
Troubleshooting