Bosch SMV40C40GB/45 D/W Not Drawing Water & Tap Light On

[jontymox]

Good afternoon all,

I realise the above fault can relate to several possible causes, and wonder if there is a diagnostic mode I can access, and if the aquastop hose is electrically testable?

The machine drains normally when a new cycle is selected, then pauses, with no attempt to draw water, prior to the unit aborting the cycle shortly afterwards.
(hence, it can’t be a flow sensor/jug or matrix fault.)

The tap light also lights, along with an audible beep… but I can’t remember if the tap light flashes, or remains lit, following my visit this morning! (I gather the “status” of the tap led is crucial when diagnosing such a fault.)

Thanks in advance for any help!

jonty

[electrofix]

if its solid its a water problem valve , tap kinked hose etc

if its flashing it can be anything else

Dave

[jontymox]

Thanks Dave,

I suspect the fault lies either in the aqua-stop hose or board, and will return to do more tests.

Does anyone know how to conclusively test the aqua-stop, as it is sealed?

jonty

[jontymox]

agua-stop fill valve sealed/potted.

[electrofix]

its still only a valve
so you can measure the coil and check to see if its powered up or not

Dave

[jontymox]

Thanks again,

I thought the unit was completely sealed, and didn’t want to break anything…

Will return, and update.

[Hollytree_Technical]

Easiest place to test the valve electrically is to go the back of the machine and pop out the panel where the hoses enter the machine, there is a connector on the back of the panel for the valve. You should get the usual 3.5K to 4.5K resistance reading, also if the resistance is good you can put a current clamp round one of the wires to see if it gets powered at all.

Jem

[jontymox]

Thanks for that info’ Jem,

Will update early next week, as too busy to return until then…

jonty

[jontymox]

Good evening,

Established fill valve/aqua stop fine (good ohms reading) but no supply from board.

Wiring to/from above fine, yet new and programmed board costs nearly £200.00!

jonty

[electrofix]

may also be a pump as they use the current to the pump as a virtual sensor. if the pump is worn it will draw more current and fool the board into thinking its not drained

Dave

[Author]

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