Bosch SBV65E00GB/50 Integrated dishwasher problem

[jontymox]

Good evening everyone,

A customer reported that her dishwasher (above) “was not working very well,” and asked for me to visit/investigate. (I had cured an E15/ Anti-Flood Device Activated error last year on the dishwasher, which had a leaking hose on the air break/matrix.)

This morning, I revisited in order to ascertain the new fault/cause, although my customer could not elaborate on the problem…

So, I re-set the machine, and monitored it’s operation on a 35 minute/quick wash to assess, with the appliance pulled out, and side panels removed.

The machine initially drained, then filled, washed, and heated perfectly during the above cycle.

However, I noticed and subsequently confirmed, that it had not drained (and refilled at all) during the above cycle, and was washing continuously when it should have finished the cycle.

When resetting the d/w again, it drained perfectly…

So, I’m wondering if the board is faulty, (not sending power to drain pump at relevant times) or if there may be a more obscure cause?

I could not test the above further, as I was running very late, yet wonder if I’m missing something?!

jonty

[jontymox]

I probably need to return to carry out further tests, and establish if power is getting to the drain pump during wash cycles. (especially as the “programmed power module” costs £210.00!)

jonty

[kaibart]

Try the flow through sensor to see if that makes any difference

[jontymox]

Good idea… you feel the m/c may be “confused” with the water intake?

jonty

[Hollytree_Technical]

I notice that this machine has a “Liquid Reservoir” on the right hand side of the machine, could it be that the actuator here has failed as I think that it should be trying to fill it at certain points in the cycle.

Also here is a service manual that i have found that seems to cover most of the newer machines.
https://elektrotanya.com/bosch_800-plus_series_dishwasher.pdf/download.html#dl

Jem

[kaibart]

Liquid reservoir it doesn’t have one it has 2 water storage tanks one on the left and another on the right

[Hollytree_Technical]

Sorry it should have said “Liquor Reservoir”, that is Bosch’s name for the extra tank on the parts list for the machine, either way it’s function is described on page 67 of the manual that I linked.

Jem

[jontymox]

Thanks for the information gents, and the manual Jem.

It’s certainly an obscure fault, which I would like to solve!

My plan is to return to the job early next week, and carry out some more tests etc.

I assume that the mentioned actuator in the “liqour reservoir” should provide an Ohms resistance, and have a “impellor jug” available, as I reckon they are very difficult to test conclusively…

Thanks again,

jonty

[kaibart]

It will have a drain valve I think by looking at the drawing

[jontymox]

Do you mean the “actuator” (00618084) which Jem has mentioned as a possible cause?

[jontymox]

Good evening all,

I’m due to revisit the above problematic dishwasher tomorrow, and am much wiser as to what may be causing the fault.

However, I’m wondering how any problem with the “liquor reservoir” can result in the “no drain” fault experienced during a wash cycle.

Regards,

jonty

[kaibart]

The drain valve, flow through sensor or heat pump can all effect it the actuator inches tank on the right hand side drains thr water from the reservoir and gives feedback to power module

[Hollytree_Technical]

My suggestion on the Liquor Reservoir is admittedly a shot in the dark as well as being based on some reading in between the lines and therefore may be totally wrong, however I will try to explain my reasoning below:

Here are some assumptions that i made:

• You say that it washes continuously which suggests that the machine is waiting for a process to finish, you only assumed that this is drainage.
• You said that it heats but don’t mention whether the tablet dispenser was activated – if not then it is probably waiting for something else other than drainage.
• The drain pump works at the start and at reset so unless it is a corrupted program (very unusual) then it is unlikley to be the pump (not impossible but low on the list).
• The service manual talks about using the liquor reservoir early in the cycle on “Star Speed” and “Turbo 20” programs – these are program names that I have never seen but maybe our “Quick Wash” programs are the english equivalent, also thanks to the EU all modern machines turn on on the “Eco” program which also uses the reservoir (I am assuming that the customer doesn’t change to a different program).
• I don’t see any specific codes for the Liquor Reservoir and as these machines use the pumps as virtual sensors for the water level it could be waiting to sense that the reservoir is full before moving on.
• From the images on the Bosch site it looks like the there is only one hose intoand out of the reservoir so it must have to actuate the actuator for both filling and emptying of this tank.

I would be thinking about checking the following (as well as any other ideas that you have):

• Does the detergent dispenser open in the cycle?
• Does the liquor reservoir actuator get power at any time? It looks like it is a wax actuator so will need to be powered for a minute or so to open.
• What is the resistance of the liquor actuator – should be around 800 to 1200 Ohms when cold.

Jem

[Hollytree_Technical]

Also what happens if you try the pre rinse cycle?

Jem

[jontymox]

Good evening all,

I revisited the above problematic dishwasher this afternoon and spent around two hours monitoring, and carrying out further tests.

However, the machine behaved perfectly having selected the 30 minute, or so, quick wash! ( drains, fills, washes, dispenser releases, heats, rinses, drains etc)

I then tried the programme on a pre-rinse cycle, as suggested, which was also fine.

So, I decided to test the “liquor reservoir” actuator valve, which gave a good reading of 1.248 K Ohms.

I remained “flummoxed,” so my customer and I agreed that she would monitor the dishwashers operation, and let me know if the fault recurs…

Not sure how else I could proceed with this one, and would like to thank all concerned for your kind help, particularly Jem and Kaibart.

jonty

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