Bosch WDU28561GB/01

[Hollytree_Technical]

Hi all

This machine is not giving any error codes and will occasionally run a cycle okay. When I was testing the machine I found that most of the time that the controls will lock up after about 5 seconds after power on (on the front power switch), I have already tried to get the child lock to set and unset but this doesn’t respond (it is also only half lit which should denote it as being turned off), I took a short video of the issue:

http://www.hollytreetechnical.co.uk/images/UK_Whitegoods/20250212_184632.mp4

I have also tested all of the temperature sensors from the circuit board end of the harness and seen the machine fill, drain and spin when it did work.

There is no visible error codes so I am not sure if the machine is failing some power on self test or if it is a faulty pcb and if so which one.

Jem

[kaibart]

Something pulling the dbus down anything with 3 wires going to the main pcb disconnect and see if it does the same.
I will post up the test sequence for the machine when I get in there’s machine are a right headache, most common faults are door lock heater and dryer pcb

[kaibart]

Test programme error log for you

[kaibart]

Test programme

[Hollytree_Technical]

Thank you

Sounds like I need to go back and play a bit more – I may even take the oscilloscope to try and watch the dbus signal, do we know if it is supposed to idle high or low etc?
I assume that the 3G sensor on the motor and the sensor on the rear of the cabinet may be on the network? You don’t happen to have a wiring diagram and error code list for it do you? This machine is of course in an awkward location and a bit of a contortionist job to access the back of it.

Jem

[kaibart]

May have a wiring diagram when you get into the test programme it may show a error very unlikely, and yes your right the 3g, 3d sensors are on the dbus
kai

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