Bosch Logixx 8 WAS28460GB

[nickbrs]

Hello, have problem with machine switching off during any cycle. Seem to think it is thermal shut down of regulator chip TNY267 on circuit board 5560 010 411 as this area is running v warm. If left power comes back on. Don’t know whether the chip is at fault or if something else is drawing to much current to make the chip run hot and shut down.
Have run machine with board open and it did several cycles OK, but now it is beginning to shut down with board open. Regulator area running hot.
Any train of thoughts?
Have searched through forum but no similar listings.

[1totalshambles]

Re: Bosch Logixx 8 WAS28460GB

“something else is drawing to much current to make the chip run hot and shut down”
I`ve thought about your problem My answer its a long shot, fairly fanciful on the face of it and is just a possibility. Sometimes you can get a fairly rare fault on this stuff where on spin the heating element comes on without any water in the machine ( I`ve seen this myself on 2 occassions ) i.e. in other words, the machine spins but there is a direct live and neutral fault to the heater. Under normal circumstances the heater glows red for about 4 seconds before the heater`s internal fuse pops at 250volts = no more heat ever but it could be possible for only 100 volts to reach the heater meaning it could still work / draw a current right through the whole wash/rinse/spin cycle without taking its internal fuse out and without any suspicion anything is amiss other than the actual going dead problem. This would give you the pcb problem you describe. The pcb is at fault in combination between 2 relays and affecting the power chip. To prove a point you would have to remove the back off the machine get 2 croc clips and a multimeter one wire on each heater terminal put it on spin and see what happens and if anything at least 4 times/cycles to prove it, having first tested the heater for it not being open circuit. Should the heater in fact be open circuit remove it and if any lime appears burnt and black that is whats has been going on, you just caught it after the event. looks like a new pcb if this indeed is happening.

[nickbrs]

Re: Bosch Logixx 8 WAS28460GB

Thank you for the suggestion 1totalshambles, also found the board would shut down with just a program selected but not started. Have found a machine on a well known auction site that the drum bearing had broken up but the rest of it was working fine for £24 It is the next model up WAS32460GB 1600 spin speed where as my machine was a 1400 spin speed model.. Have swapped every thing electrical and electronic (apart from the worn door lock) over into my machine as the body was in better condition than the donor. I did this just from the point of view was it one of the sensors that was going faulty and drawing too much current from the board.Is all up and running and seems fine. Just out of curiosity what makes the model have a 1600 spin speed, is it the motor alone, the motors drive unit, motor drive unit and motor as a pair. Just wondering as I’ve kept all the bits taken out of my machine as possible spares.

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