[jpscm]

Re: Ariston Margherita CDE 12 X not filling water

Hi bzz67,
I guess it is not a supply issue because when I unplug the supply pins from the valves, I measure 50Vac.
But measuring the voltage across wires connected to the valves is 0Vac.
So, when I plug the wires on the valves the voltage goes from 50Vac to 0Vac. Is this normal? I would think not and therefore suspected on defective valves. What do you think?

Joao

[jpscm]

Re: Ariston Margherita CDE 12 X EEPROM incompatibility?

BTW, assuming this theory of defective heating circuit to be correct, which element should I expect to be defective: the thermistor or the heater?

[jpscm]

Re: Ariston Margherita CDE 12 X EEPROM incompatibility?

PS: Just FYI, I don’t have a megger, so I have to rely for now on the multimeter.

[jpscm]

Re: Ariston Margherita CDE 12 X EEPROM incompatibility?

Hi,
Thanks for the replies.
FYI, the resistance on the thermistors are +/- 23kOhm. Before I was measuring without unplugging the electric wires connected to the module and that is the reason for the difference in the numbers that I indicated before.
So I guess there are not open circuits, but can I conclude they are working fine? I mean, couldn’t they be triggering on a different temp, if they were defective? This is just an idea, but if they would be ‘reading’ a wrong temp, it would explain why it does not give any error message (with original eeprom) but does not finish the wash cycle, wouldn’t it? It would be waiting for ever to get to the 40ºC temp!

Meanwhile I have unsoldered the new eeprom and solder again the original eeprom and the washer is again working as before, i.e., it does the washing but need to move from washing to drain manually and then it drains, rinses and spins as expected.
I got the new eeprom from an Ariston office. It is the eeprom for my washer module (the model is writen in the chip box). As it is not working at all in my washer, do you think that it could be not programmed (void) or needing some custom prog fitting?
I have tested most of the pcb components and all seems to be OK including the analog IC’s. The ones that I can not test are the eeprom and the (huge) Merloni u-controller. Do you think I can buy a u-controller to Ariston without getting the complete module?

[jpscm]

Re: Ariston Margherita CDE 12 X EEPROM incompatibility?

Hi Jim,

The measured resistances are the ones that I indicate before and temperature should be around 20º.
Should the difference to the expected resistances indicate damaged devices or in that case would they always be in open circuit?
Do you recomend trying new thermistors? Any other suggestion before a new PCB board?

[jpscm]

Re: Ariston Margherita CDE 12 X EEPROM incompatibility?

Hi Jim,
I checked the resistance on the heaters.
32Ohm for the main heater at the back of the drum and 44Ohm for the heater at the top dryer.
I also measured the resistance for each sensor (thermostat): 8.5kOhm for the first and 3.5kOhm for the second.
Should these be OK?
If so, do you have any other suggestion for debugging?

Joao

[jpscm]

Re: Ariston Margherita CDE 12 X EEPROM incompatibility?

Hi Jim,
Yes I am posting from Portugal, but the washer is a 2002 Italy product.
I’ll do that test and get back to you. What should I be looking? Resistance on the temp sensor? (Round device where 2 thin wires are connected to?) I guess there’s one in the top (heater?) and one in the lower back (drum?). Should I check both? I would be looking to ~20kOhm with main power-off?

BTW, if the problem is not in the eeprom, shouldn’t I be getting similar results with both eeproms? What should I conclude? Can you confirm if there is only one eeprom version for the Margherita CDE12X?
Thks, Joao.

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