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AEG lavamat 88730 update error C7

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AEG lavamat 88730 update error C7

Postby jobloggs » Sat Oct 27, 2007 11:43 am

please help

finished 1 wash load ok, re-loaded, selected my program pressed go then came up with error C7, the top 3 lights are also flashing, hasn't taken any soap or anything?

thanks
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Re: AEG lavamat 88730 update error C7

Postby Penguin45 » Sat Oct 27, 2007 4:38 pm

Heater out of circuit or failed. Heater relay on power board failed. Possible temperature sensor (ntc) failed.

Penguin45.
Which bit of "Unplug it" is causing the problem?
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Re: AEG lavamat 88730 update error C7

Postby jobloggs » Sun Oct 28, 2007 5:44 pm

any chance of any circuit diagrams?

I get aprox 28ohms across the heating element and nothing to earth, so assume good.
the temperature probe I get just under 5Kohms at room temp, again, assume good.

main cct board at the top which looks to be for the heater, burn power connection, cleaned up and meters ok, relays meter out and appear ok.

still the same,

C7 and the pre wash, main wash and the rinse leds flash?

Starting to struggle, I am an electrical engineer but not in the appliance trade, but should be able to cope with anything technical with my back ground...

please help!! washing pile getting bigger!!!

Thanks
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Re: AEG lavamat 88730 update error C7

Postby jobloggs » Sun Oct 28, 2007 8:20 pm

Don't know if this is relevent, but the on the last 'working cycle I stopped it before it finished, it was about 3mins to the end on a quick wash.

I then selected a long spin and started it, this ran ok, was the next wash that didn't work.

thanks again.
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Postby helo_75 » Sun Oct 28, 2007 8:24 pm

it isnt heating... if the heaters ok and the thermistors ok, the heater relay is fine, havent u answered your own question

what do you think operates the relay?
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Re: AEG lavamat 88730 update error C7

Postby jobloggs » Sun Oct 28, 2007 8:33 pm

its not even taking in water, I turn it on this error occurs. will not even let me start the cycle?!?!
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Postby helo_75 » Sun Oct 28, 2007 9:59 pm

nope, because it runs a diagnostic before it starts

something faulty - whats the point?

have you actually checked the pump yet?
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Re: AEG lavamat 88730 update error C7

Postby jobloggs » Mon Oct 29, 2007 6:08 pm

yes pumps clear even removed the pipes to the pressure switches and turned on, still the same.

only been a month since I had to replace the bearings.

some circuit diagrams if available would really help.

Thanks
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Re: AEG lavamat 88730 update error C7

Postby iadom » Mon Oct 29, 2007 6:58 pm

jobloggs wrote:
some circuit diagrams if available would really help.



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That which can be asserted without evidence, can be dismissed without evidence.
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Re: AEG lavamat 88730 update error C7

Postby jobloggs » Wed Oct 31, 2007 6:30 pm

ok, I understand the reasons that you do not give out diagrams etc.

been trying to work it out, struggling to understand how the machine would know if the heating element is open cct when the connections to it, go through the door switch and the pressure switch so when there is no water in the machine there would be no complete circuit back to the main control board? even when to door is closed? so how would it know?

Does the board have memory for errors like this? can it be reset? if so how? this would explain alot, if this is the case I would suspect resistive contacts on the pressure switch as it seems intermittant.

Someone could really save me a lot of time here mapping out the wiring. Or where can i buy a service manual for this washing machine, by this i don't mean an idiot guide, I need circuits and error codes etc.

I fear that the main control pcb is at fault and at nearly £200! I think this will be going to the kitchen in the sky unless i can repair it! which is really sad as I have just spent quite a bit of money on it changing the bearings and its a really good machine! :cry:
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Postby helo_75 » Wed Oct 31, 2007 8:30 pm

u need to get in the diagnostics m8

not sure how to do it on one of them, im sure theres a serviceforce guy around who might be able to advise
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Re: AEG lavamat 88730 update error C7

Postby jobloggs » Tue Nov 06, 2007 6:14 am

Still not working.....

can someone tell me how the 'digital' pressure switch works, has 3 connections 5v 0v and digi which i assume is the output, the 5v to the sensor is good but the output is at 3.8v? this seems an odd voltage for a digital output, when i blow gently the the voltage changes range briefly, (up i think, will need to scope it to be sure) then goes back to 3.8V, does nothing when pressure is released.

Where can i get one of those diagose m8's?

Thanks
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Re: AEG lavamat 88730 update error C7

Postby Martin » Tue Nov 06, 2007 8:21 am

jobloggs wrote:I fear that the main control pcb is at fault and at nearly £200!


I'm certain of it :cry:
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Re: AEG lavamat 88730 update error C7

Postby jobloggs » Fri Nov 09, 2007 6:42 am

where can I get a secondhand spare? not paying £200! for a new one, its just not worth it, its 6yrs old.

Thanks
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Re: AEG lavamat 88730 update error C7

Postby Martin » Fri Nov 09, 2007 8:45 am

jobloggs wrote:where can I get a secondhand spare?


Almost impossible to imagine where?....Ebay maybe?....Give us the PNC number of your machine, we can then tell you what the part number is, then you can try searching Ebay for one? :wink:
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