AEG oven overheating problem?

[toddgibbs]

Hi guys,

My AEG Competence 2100B (I think its the 2100) oven has just started playing up.

When I switch it on to, say, 200/c it works for about 20mins and then cuts out. It all appears to be working ok but the oven isn't being heated and it gently cools down. The lights work on the front except the 'heating now' one on the left-hand side and the control dials are burning hot.

It then takes about 30mins to cool down (you can monitor its temperature with the thermostat dial). Some time later (not timed it yet) it will work as normal again for 20mins.

Does any one know what the problem is and how to fix it ? the oven is

2yrs old.

Thanks in advance

Todd.

[Andy Cap]

IANAE but I do have the 4100 and had a *similar* problem !

On this model there is a cut-out device installed under the top cover, centrally above the oven. In my case this failed and killed the oven full-stop.

In your case it sounds as if it's functioning corrently. i.e. the oven housing is over-heating. I guess this points to the cooling fan not running. There should be a air-stream being forced through the housing, in the 4100 case, by a cylindrical type fan, mounted towards the rear, which exits through a vent in the door.

HTH Andy

[Guy King]

The message from "toddgibbs" contains these words:

My similar model did something similar.

There's a fan that runs while the oven is on, to draw air through the casing to keep the innards cool, and it also runs on for a while after you switch off to cool it down. For safety there's a thermal cutout which turns the oven off if the inside (that's the gubbins, not the oven space) gets too hot.

What happend on mine was the delay device that was supposed to keep the fan running on after use failed. It was a crap design, there's a little blue silicone sock in which is a heater element and a thermal switch. When you switch on the heater makes the thermal switch operate the cooling fan. When you switch off the silicone sock insulates things so it doens't switch off too soon. The switch connections are soldered/brazed/whatever onto the substrate and after a while they burn out.

The upshot is you have no cooling fan running, so it all gets too hot and the safety cutout operates. Infuriating.

I took the silly blue thing out and replaced it with a relay and a small timer. OK, so the fan now runs on for perhaps longer than necessary but at least I get my dinner.

The bit that's died looks like this...

[toddgibbs]

Thanks for the repliles guys.

The cooling fan does run sometimes, but it definately is off when it gets too hot.

Strangely, if I set the oven to 100/c it runs fine for ages (until I switched it off). The thermostat governs the temperature correctly and switches the oven on/off appropriately.

Why doesn't it function when set to 200/c? I would expect the thermostat to govern the temperature as before regardless of the fan ...

I'll do some more tests (ie, leave it at 150/c, 170/c etc and see what it does)

Thanks again.

Todd.

Guy K> The message

[Guy King]

The message from "toddgibbs" contains these words:

Because at 100°C the casing can shed enough heat to stop the safety device shutting it off. At 200°C it can't so after a while it dies.

Take it apart and find the blue thing in the picture - bet it's charred.

[Andy Cap]

Yes I changed mine. Did you get Part P approval for your modification ? ;-)

Andy

[toddgibbs]

Ok, I'll have it out tonight :)

Any idea where I can get a replacement part? (and what the part number is?)

TIA

Todd Guy K> The message

[Andy Cap]

Melton Technical Services Ltd (Service Force Centre) Melton Technical Services Ltd (Service Force Centre) Unit H3 Burrell Road Haywards Heath RH16 1TW

Telephone: [phone] Website:

do them but they aren't cheap ! There may be cheaper places around.

Andy

[Guy King]

The message from Andy Cap contains these words:

It's my cooker.

May I refer you to the Owner's Manifesto?

[Guy King]

The message from "toddgibbs" contains these words:

I didn't pursue that option when I fixed mine 'cos I didn't want to put a known shit part back into an otherwise OK cooker. I used a relay and shoved a delay onto it.

[toddgibbs]

Well, you were 100% correct, The little blue thing looks just like your photo, all burnt out.

I'll call the company you suggested tomorrow to get a replacement. Do you happen to know what the part is called ?

TIA

Todd Guy K> The message

[toddgibbs]

Well, you were 100% correct, The little blue thing looks just like your photo, all burnt out.

I'll call the company you suggested tomorrow to get a replacement. Do you happen to know what the part is called ?

TIA

Todd Guy K> The message

[Guy King]

The message from "toddgibbs" contains these words:

"That sodding stupid piece of crap that should (and has) been replaced with a proper circuit".

Out of interest, let me know how much the spare is - and whether it looks the same or not.

[Andy Cap]

The thermal cut-out thingy in the blue sleeve ! ;-)

Andy