Oven not working as expected.

[Mymla]

The only printed circuit board I see is on the clock. There are relays (one black and two white cubes)

 

[Minder]

Generally the only reason they are there is to switch elements, for me, these are the first things to check, many have a burnt PCCT board where the relay pin is soldered to the board, can you see the reverse side?
M.

 

[Mymla]

Can see the reverse side and no burns at all

 

[Minder]

Often the relay's output to a terminal strip or multi-conductor plug on the edge of the board, the conductors will often go to element terminal connections.
If so, These can be traced.
M.

 

[Mymla]

They don't seem to be going anywhere in particular. Would that matter though if the clock is bypassed?

 

[Minder]

Normally you can see where the contact foil on the board goes to.
The relay coil is normally the pair with a small diode across.
You should be able to bypass the clock contact briefly for test purposes.
M.

 

[davenn]

Behind the top panel as in where the clock is? or towards the back?

Thanks for the help!

take a clear photo or two of the back of the control panel so we can see the wiring to the clock and rheostats relays etc ,,,, make sure we can read markings on them
Most ovens I have worked on have a circuit diagram on the large back cover .... doesn't yours ?
usually on the inside of the cover

 

[Minder]

Out of interest what is the numbers etc on the relays?
M.

 

[Mymla]

Ok give me 5 mins

 

[Mymla]

http://imgur.com/a/CbT3S

Here's all of the images I have taken. It's kind of hard to see where everything goes

Thanks a million for the help guys!

 

[Mymla]

The black cube on the clock is this: http://www.bjjqkm.com/upload/201608/23/201608231725352363.JPG

I'm guessing that is a buzzer for the beeps

 

[davenn]

yup thanks for that

Minder has, as I suspected, been getting obsessed with relays for switching the elements ..... they don't exist

I remember those clock modules from years gone bye .... I had a mate who was a supervisor on a range/oven assembly line
and he used to get me some of those clock modules occasionally ... they may have had scratches etc on them and couldn't
be used and would normally have been tossed out ...... ohhh that was a lifetime ago hahaha
those relays are reasonably low current ... a few amps, nowhere near enough for switching elements on and off


have you actually proved that there is 120/240 VAC ( whatever your country uses) on the wires going to the elements etc ?

do you have a decent multimeter that is safe to use at 240V ?

 

[Mymla]

Don't have a multimeter i'm afraid so I can't prove that. I was thinking it wouln't be the element since both the grill and oven and light inside won't switch on. I just feels like something in the circuitry isn't switching things on. Maybe the selector control is the issue? It's the only thing that seems to make sense at this stage

 

[Bluejets]

First thing would be get yourself a multimeter.

Did you actually check to see the clock was not on automatic, regardless of what you think you may have "bypassed"?

 

[Mymla]

Yes I've tried the clock every way I can

 

[Mymla]

I bypassed the clock as suggested by connecting the three wires on going into the top left of the clock,

 

[Bluejets]

Yes I've tried the clock every way I can

Still sounds like an auto trip to me......... did you check the user manual on how to reset back to manual control?
Your description makes me believe you are trying things you think may be the problem without checking the user manual. Reason I add this is because these things can trick even a seasoned maintenance tech.

Without a multimeter you are up the creek with the tide against you.

 

[Mymla]

To be honest, that is exactly how it feels. But I have tried everything in the manual. The manual is here: http://kitchen.manualsonline.com/manuals/mfg/aeg/b11804.html

there seems to be no way of resetting the clock. only adjusting the times which I have tried

 

[Bluejets]

Went through the manual you supplied a link to and read primarily on clock set-up.

I will go through these one at a time and if something clicks that you might have missed, it might help getting your oven to turn on manually./ or at least, remove any possibility of the clock being at fault as far as "auto lock out" is concerned.

Page 9 says the clock must be set. I remember your saying you had disconnected it at times and wonder have you re-set it as per this page.

I doubt there is any need to actually set to current time, it is more that the time has actually been set and the display no longer flashes.

Probably best to cycle off the supply for a couple of minutes just to make sure you are at the “first time” point. I am guessing this should remove any previously entered “automatic turn on or turn off timing”

So the clock display will flash when first powered, and then stop flashing once time set as in page 9.

 

[Minder]

I may be obsessed, been called worse!.
But the high end toaster (1800w) oven had one of these that enabled the various element power, everything else worked.
M.