Siemens SN44T580SK/23 Type SD6P1S heating problem

[yurtesen]

Hello,

I am trying to solve the heating problem in my friend’s machine. It is a very strange problem. It often seems to heat in quick wash cycle. I didnt test the temperature. But it never heats in normal cycles. It sometimes prints E.02 error after wash cycles. I tried to run a cycle after removing the NTC thermistor connector and it printed E.02 after cycle. I don’t know what to make of this information since I couldn’t find what E.02 is exactly.

So far what I did is to look at the control board. It is immaculate, like it was produced yesterday, without any flaws. All the connectors were clean and attach tightly. The board is EPG60110 with an id number of 9000376770

Then checked the heater / motor. I found this excellent post from Martin.
viewtopic.php?t=84118&p=409396#p408938

Both heater element contacts measured slightly over 10Ohm and the total 20Ohm. The NTC element contacts measured about 10kOhm first the difference was 0.1kOhm between 2 elements (I believe this is a small enough difference?). After a quick wash cycle, I checked them again when machine was still warm and they showed about 7kOhm, again with exact 0.1kOhm difference between them. (which I assume is acceptable variance?)

I measured some of the SMD resistors where the NTC connector is connected and they gave consistent right values.

In addition what machine does at startup is first remove water, then take a small amount in and then it opens a solenoid valve on the left lower side of the water panel. Unfortunately I forgot to take a photo but the water panel looks like in this photo and solenoid is the one marked as 0404
https://www.how-to-repair.com/help/wp-c … -parts.jpg
Machine opens that solenoid for a while at startup (I know it opens because I can see it through semi-transparent water panel walls) for almost a minute but nothing else happens. Then starts taking water again.

I assumed the front panel LCD simply communicates with the control unit so I did not really check for any problems in that. The display seem to work perfectly fine.

Do you have any idea why this may be happening? What to check / try next?

Thanks!
Evren

[Martin]

Re: Siemens SN44T580SK/23 Type SD6P1S heating problem

Firstly Everen the E:02 error relates to a faulty main control module 🙁

It could well be the heater relay on that board is faulty.

Secondly, the fill sequence is controlled by the reed switch/water wheel unit in the fill matrix. It might be that that reed switch needs replacing? (Common fault)

HTH? 😀

[yurtesen]

Re: Siemens SN44T580SK/23 Type SD6P1S heating problem

Hi Martin,

I also found similar stuff online: “If you get the error E 02 on your Bosch Dishwasher then the primary relay on the power module has failed and it is working off the saftey backup relay. You will need to replace the power module.” http://www.techanswerslive.com/appliances/bosch-dishwasher-error-code-e{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d}3A02—e02—e-02/21/

Does this mean that the ‘relay’ itself should be changed (because that would be easy, but I have feeling the solution is not so easy)? This really doesn’t make sense to me since it works fine in quick wash 9 out of 10 times. I thought maybe it gets confused due to some sensor reading on different programs. Perhaps I should try to check the relays for functionality. Also I didn’t know that there were 2 relays for heating…hmm a lot of things to consider 🙂

The worst part is that I read that the control unit for this machine should be programmed for exactly same model so it can not be changed to another even with exactly same part number. Is this true?

About the reed switch I found this thread which has a similar switch as in this machine http://www.ukwhitegoods.co.uk/forumsphpbb3/replace-reed-switch-bosch-exxcel-sms50e12gb-t89785.html but I dont get any other E error codes than 2 in this machine. Also after a while it seems to fill to correct amount. I just wonder what is the purpose of that solenoid there… But I will check the switch for operation never the less.

Thanks,
Evren

[Martin]

Re: Siemens SN44T580SK/23 Type SD6P1S heating problem

Yes replacing the relays in the board the best option. Quick wash 9 out of 10 is a red herring so not to be relied on.

If the module number is exact then that will be OK as they fit a number of machines across the Bosch Siemens and Neff range.

Reed switch/ fill problems throw up E:17 E:18 faults so you can probably ignore that and concentrate on the E:02 issue.

[yurtesen]

Re: Siemens SN44T580SK/23 Type SD6P1S heating problem

Thank you Martin, I will return back with a success/fail info 🙂 I first need to figure out the relay models and obtain replacements and replace them. It will take a while

I also found another thread with a similar problem now. http://www.ukwhitegoods.co.uk/forumsphpbb3/neff-s51m53x0gb-intermittent-heat-but-codes-t79132.html

I am guessing the module number is 9000376770 correct?

[Martin]

Re: Siemens SN44T580SK/23 Type SD6P1S heating problem

yurtsen wrote:I am guessing the module number is 9000376770 correct?

No, it is 00648929 ‘Power Module Programmed’

[yurtesen]

Re: Siemens SN44T580SK/23 Type SD6P1S heating problem

I don’t quite understand how you came up with 00648929? Because all the text on the existing module is EPG60110 and 9000376770 and date etc. [edit]ah now I see the module at siemens site, but it costs 220euro and I guess they have to program it for this model before sending. I was thinking of getting a used module cheap on eBay with the existing numbers I had. I guess that is impossible then if same number items have been used on multiple machines[/edit]

In either case, the machine had relays with marking “HF7FD 012-1ZPTF(576) NO:12A/250V NC:7A/250V – NO:12A/250V NC:7A/277V Res. Only” I changed them with RELPOL RM50-3011-85-1012 relay.

Interesting thing is that on bench, I tried to give old relays 12V and they close properly with no contact resistance whatsoever. I expected them to not do any connection at all. The relay solder joints were in perfect condition so I don’t quite understand what is going on at all.

But now the machine seems to be working, we ran several cycles until it warmed up the water and it just worked nicely. I guess it will survive until the relays wear off. Unfortunately, I couldn’t find a better relay in such short time….

Thanks for the hint!

[Martin]

Re: Siemens SN44T580SK/23 Type SD6P1S heating problem

yurtesen wrote:I don’t quite understand how you came up with 00648929?

Very simply : Siemens Website, typed in SN44T580SK/23 looked at the schematic parts diagram, found Module, clicked on it then text came up ‘00648929 Control Module Programmed’.

It is fully programmed for that specific module, you just plug it in and switch on. Yes they are VERY expensive, NO I wouldn’t buy one ever off eBay. Hence you chose the third option of simply changing the relays. Job done Everen, congratulations. 😀

[Author]

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