Bosch SGV43A03GB No Power

[timpe]

This is a fully integrated dishwasher. No sign of life on the “concealed” control panel when the power button on the top of the door panel is pushed. Was working fine, then just failed to work when next used. No prior faults in over 2 years.

Checked obvious of power plug fuse and power outlet is powered, Power cable checked and is in original condition. All front panel wiring loom connectors in place.

I dont think it can be a fault such as door switch etc, as control panel lights should operate with door open to allow programming.

Is there an internal fuse / trip to check after the power cable enters the back of the base of the machine?

Seems like a basic failure – advice welcome to eliminate the obvious.

Thanks

[Penguin45]

Re: Bosch SGV43A03GB No Power

They have an occasional habit of blowing up the mains suppressor/terminal block where the cable enters the machine at the back. Failing that, and given your other testing, the board itself may well have just died.

Stay safe, power off.

Regards,
Penguin45.

[timpe]

Re: Bosch SGV43A03GB No Power

Thanks for that. I will try the suppressor before worryng about the board.

[timpe]

Re: Bosch SGV43A03GB No Power

The supressor module is fine.

Following the wiring, the filter is actually on the unswitched side of the mains supply. The wiring goes from the suppressor up to the mains switch at the top of the front door. I think it is worth checking that the power switch is ok before going for the control board.
How do you access the switch – does it drop down from the top panel, or do you have to remove the panel it mounts in at the top of the door to get access to it? (if so is this just a torq screw removal job?)

Thanks

[Penguin45]

Re: Bosch SGV43A03GB No Power

Basic access is to remove the torx screws. If you actually need to remove any components the plastic surround has to go and that’s a real swine to get off.

Regards,
penguin45.

[timpe]

Re: Bosch SGV43A03GB No Power

Thats a speedy reply!

Found the 4 torq screws holding the panel. No problem removing the plastic panel and removing the switch.

Ran a continuity test on the switch pins, and didnt quite get what I expected. Continuity between the adjacent pairs on 4 pins, but the pair of pins nearest the front of the machine showed no continuity in ON or OFF position. This would mean that the mains live and neutral are being switched ok, but the white wire (which appears to loop to the switched neutral pin) does not connect in either ON or OFF.

I dont know if the correct operation is that all 6 pins connect to their adjacent partner in the ON position – if so I have a faulty mains switch (only 4 pins doing this). Seems logical, as if not why use 6 pins, when apparently only 4 are needed.

[BSH-MAN]

Re: Bosch SGV43A03GB No Power

timpe wrote:Thats a speedy reply!

.

Continuity between the adjacent pairs on 4 pins, but the pair of pins nearest the front of the machine showed no continuity in ON or OFF position. This would mean that the mains live and neutral are being switched ok, but the white wire (which appears to loop to the switched neutral pin) does not connect in either ON or OFF.

.

It’s a “momentary” switch, like your P.C. power switch.

[timpe]

Re: Bosch SGV43A03GB No Power

Thanks – that eliminates that option.

Unless anyone can think of anything else, it looks like the only part left is the controller module. More used to these failing erratically than a sudden change from go to no go.

Much appreciate all the good advice in this forum.

[timpe]

Re: Bosch SGV43A03GB No Power

Do these models share the contoller with other Bosch models?

I have been offered a controller from an SGS43C12G but am unsure if it is suitable.

Thanks

[Penguin45]

Re: Bosch SGV43A03GB No Power

Board will not fit – the one you have been offered is for a free standing appliance, so the buttons face forwards, not up.

Yours is p/no 492685, showing at £76.30 on http://www.bshappliancecare.com plus VAT, handling etc.

Regards,
Penguin45.

[timpe]

Re: Bosch SGV43A03GB No Power

Thanks for that.

Ordered part from Bosch as suggested. Interesting online experience!

Their site doesnt work at the weekends, but they dont say that! The original part 488432 was shown, and an order could be created. Only hint that all was not working well was that all credit cards were rejected when placing the order, showing a message “invalid card”.

All works on Monday morning, and the alternative part 492685 as you indicated was shown. Basket total inc VAT and delivery was shown as £87.07, but the email confirmation of the transaction shows a total of £96.07. inc VAT and delivery.

So beware!

[gegsy]

Re: Bosch SGV43A03GB No Power

Net Amount 76.30 GBP
Transport costs 6.00 GBP
Sub total 82.30 GBP
VAT ( {e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} 17.5 ) 14.40 GBP
Total Amount 96.70 GBP

It does tell you all this before you complete the transaction, an email to spares@ukwhitegoods.co.uk would have also got you the spare.

Greg 😀

[timpe]

Re: Bosch SGV43A03GB No Power

Thanks everyone.

Just to close the thread, the fault was the controller.

Appreciate all the help.

[timpe]

Re: Bosch SGV43A03GB No Power

Ok spoke too soon!

Ran the machine on the spray cycle to test and all was ok.

Followed up by running a normal wash cycle. All started ok – celebrate!

Cycle didnt finish. Machine stopped mid cycle – hot inside with steam when door opened. Hot water in bottom of machine above drain mesh.

Cleared water out and that all filters clean

took pump impeller cover off and checked all clean. Rotated impleer in both directions ok and felt motor “pressure” as rotated.

Checked black rubber flap valve on pump outlet ok.

Took side of machine and looked in plastic U loop – which was empty. Disconnected pump side pipe and can blow through this ok. It had a little water in it.

Disconnected outlet pipe at U loop and at drain outlet. Little standing water. Reassembled again, and can blow at drain outlet and feel it in machine at filter with little back pressure.

Machine exhibiting “dead” symptoms, Checked power present to output of RFI filter, and this is ok.

Difficult to fault find when nothing works !

Any ideas what I am missing?

Thanks

[Simon46]

Re: Bosch SGV43A03GB No Power

Is the fault the same as when it first went faulty? just thinking it may be something that has blown the board again.

Regards
Simon

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