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Techdesk, Service Engineer
Category: Appliance
Satisfied Customers: 16409
Experience:  Whitegoods engineer working for a multibranded national company in the UK
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Re Siemens Dishwasher model FD 7912. All programs run the

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Re Siemens Dishwasher model FD 7912.

All programs run the full time indicated on the dial.
Final wash on all programs result in poor partially cleaned everything.
Usually use the Normal Program for good results.
Rinse aid setting as usual and both rinse aid & salt are at the correct levels.

Have washed+cleaned:- coarse & fine filters/Drainage pump filters/removed pump

cover & cleaned away a very,very small amount of debris/top & bottom spray arms.

Have not checked water feed input filter in the rear connector.

No water appears to be coming from the fixed arm in the roof of the machine when stopped between programmes. This was observed by leaving cups/bowls standing upright on their bases in the top tray.

I hope there is enough info for you to work your magic.
Alan
Hiya,
Can you post the E-nr number of the appliance please?
If not on a label, it's very faintly etched across the top of the inner door.

Thanks
Customer: replied 4 years ago.

As best I can tell--


 


8E24207GB/01 OR 3E24207GB/01

Hiya,
Thanks for that.
Unfortunately, it's not correct.

SE24 would be the start, then it should be a letter.
The 07gb/01 could be correct.
I need the letter between them.

Sorry
Customer: replied 4 years ago.


Markings v poor but looks like with light+ magnifying glass!!


 


SE24207/GB


 


ANOTHER NUMBER ON TH LABEL 005657


 


Alan

Hiya,
Thanks for that.
I've got the exploded view of the appliance now.

When you run a program, does it sound like it's spraying the water with good force?
or, does the wash motor sound strained?

Thanks
Customer: replied 4 years ago.

No it doesn't sound like it's spraying the water with good force.


 


Not sure about motor strain.


But when the drive cog was exposed when cleaning I was able to turn the cog/shaft which seemed to spin a little, say half inch when a light pressure was applied to the fins on the cog.


Alan

Hiya,
That's the drain pump you exposed, it's nothing to do with the wash motor pump.

If the water isn't being sprayed with good force it would suggest the wash motor/pump is failing.

Put the machine on a wash.
Open the door during the wash and set the arms at a front to rear position.
Close the door and let it wash for 5 minutes.
Open the door again, see if the arms have moved.

Let me know what you find.
Thanks
Customer: replied 4 years ago.


The result from your test is that the lower arm was about 2 inches from an exact side to side position, from the front to back position.


 


The upper arm was more or less fully side to side position, from the front to back position.


 


Alan

Hiya,
OK, so both arms are moving.
That would suggest there is enough water flow.

You said earlier the wash result was poor.

Is it worse in the top basket?
Can you define what you mean by the wash result being poor?

Thanks
Customer: replied 4 years ago.

Yes it is worse in the top basket.


 


Food debris remains inside and outside most items, even though they had been rinsed as usual prior to the wash.


 


In the 5 minute test the level of water was only just level with the large FINE filter in the bottom, is this relevant?


 


Alan

Hiya,
OK, thanks for that.
The water level appears to be a little low.

When the wash ends, are the dishes very hot?

On the next wash, when it starts to wash, open the door and add a jug or two of water to bring the water level up.
(If you add too much the machine will pump it out).
See if the wash improves.

How are your diy skills?

Thanks
Customer: replied 4 years ago.


Yes the dishes are very hot.


 


Ok we will give it a try, do we load the washer to do this test?


 


Pretty competent at most skills.


 


Is the water pump for washing likely to be dodgey because


a quote for the pump itself is around £200.00 !!!


 


Alan

Hiya,
Yes, you need to do this with a full load, it's the only way to see if it washes properly.

Thanks
Customer: replied 4 years ago.

Hi ........


 


I'm very, very sorry but we do not have enough dirty items to get anywhere near a full load.


Pls advise what we should do?


 


Does my reference to the problem with the very top water/spray outlet from the roof help with your diagnosis? It is fed from a continuation of the water feed up the back wall of the machine which spurs off to the upper arm, continues to the roof then across into the centre spray nozzle?

Hiya,
Just run the program tonight with as much dirty dishes as possible.

No, I think the fault is a lack of water, so you need to add water to test the theory.

Thanks
Customer: replied 4 years ago.

I will follow your instructions tonight.


 


What is the procedure for continuing this problem with you?


 


Unfortunately I have had to use an alternative email to my own because if I do it rejects it. How can I re-instate my own, [email protected]


 


If adding more water does improve matters, is the pump still suspect or is there a water level sensor or similar involved?


 


Thanks for your assistance, you have been very patient.


I hope to have further contact with you.


Alan


 

Hiya,
You have links in the emails you receive to bring you back here.

Sorry, for your account, you need to contact customer services.

Yes, there is a pressure chamber and metering tank involved.

Thanks
Customer: replied 4 years ago.

Hi.


The results from the full load in the dishwasher and adding 3-4 litres of water half way through the economy programme (which we normally use) were:-


All items on the bottom shelf had some improvement and those on the top shelf didn't have any noticeable difference.


The only difference with the setup inside the machine to the usual was that the top shelf was on the upper runner, hence more space from the top of the machine.


I hope the results help to get a better idea of the underlying problem.


Thanks again, Alan

Hiya,
OK, thanks for that.
This test has ruled out an under-filling fault.

At the end of the test wash, were the dishes very hot?

Does the water get hot during the wash?

Thanks

Customer: replied 4 years ago.


At the end of the wash the dishes were very hot.


When the test was done last night with the extra water, at that time when opened the water didn't appear to be very hot.


Alan

.

Hiya,
OK, that rules out a heat problem.

The machine is doing everything it should be doing, going by the test results.

It fills, it empties, it sprays water, it heats, the arms rotate, with the exception of the very top arm.
However, the upright cup/bowl should still have filled with water as the upper arm sprays water upward.

I think this all suggests the problem lies with the circulation motor.
It's running, the pump is being driven but there's insufficient pressure to lift the water fully to the top of the machine and there's only just enough flow to turn the arms a little.

This would require a new circulation motor to sort the problem out.

Sorry, not a simple or inexpensive repair I'm afraid.

Check it out again, repeat the checks if necessary and get back to me if you need more help.

Hope this helps
Thanks
Techdesk and other Appliance Specialists are ready to help you
Customer: replied 4 years ago.

Obviously not the answer I wanted.


We will give it another go tonight, who knows maybe it will shock it back into life!


Is the circultion motor one which has an armature and brushes, and is it easily accessable?


 


Much appreciate your help.


 


Alan

Hiya,
Unfortunately, no, there's no brushes in the motor, they have a capacitor to start them running.

I'm afraid, if it doesn't sort itself out, you're looking at a new circulation motor.

Access on this machine is terrible.
To get proper access to the motor, all the panels have to come off, the door comes off and the tub comes off.

Thanks
Customer: replied 4 years ago.

OH WELL!!


Thanks for trying, I think I'm going to go away and have a good CRY!!!


 


You have given me VERY GOOD SERVICELaughing


 


Thank you.


Alan


 


 

Hiya,
sorry it wasn't an easy fix.

The machine is nearly 15 years old (1999 machine)

You may want to consider replacing the machine rather than repairing it.

Good luck with it, whichever way it goes.

Thanks