Beko DFN28R31X Dishwasher control board

[telemek]

Can anyone help me with this, a Beko DFN28R31X Dishwasher that blew the control board (black charred components) so replaced and worked fine for a couple of washes then blew the new board, thinking it may be the through heater so removed and tested with a RCD and seems ok so looking to see if anyone has similar experience. Thanks

[electrofix]

will have to see the board and what has gone to enable to determine what has blown

it was unlikely to be the heater unless the heater relay or its tracks are damaged

Dave

[Hollytree_Technical]

I don’t have a wiring diagram for this unit but I would suspect that TR7 may well supply the power to the wash pump.
Have you also checked for broken/damaged wires in the door hinge?

Jem

[electrofix]

if i am right thats connector KN2 with damaged tracks and that seem to feed the detergent draw

if tr7 is the large triac then that does seem to feed the fan

Dave

[telemek]

That would make sense as the panel blew on the drying part of the cycle, I have checked the wiring at the bottom of the door and all appears ok but I will double check also check the fan, cabling to it etc

[telemek]

Just giving an update, re-checked the wires at the bottom of the door and all ok also traced the wire back from the triac and it goes to the fan and also checks ok. I had previously changed the ntc for the water temperature as the water was just warm and the problem started after that but probably a coincidence.

[electrofix]

with these sort of faults you follow the blown tracks

the tracki have acted like a fuse so a high current has flowed. you need to work out how that current flowed and from where to where

Dave

[electrofix]

can send you the diagrams if you want but need an email

Dave

[telemek]

Thanks Dave, that would be great, please send to mgrosstv@gmail.com

[electrofix]

sorted

Dave

[telemek]

Just wanted to update, found the cause of the blown tracks and transistor, there was a electrical leak on the thermoactuator probably due to water getting into it but not sure, replaced and all works fine, thanks to all for the help.

[electrofix]

those thermo actuators are always suspect
Servis used to use them on the soap draw and very old Bosch combi microwaves use them and had them blow a lot

Dave

[Author]

Posts