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It sounds like you're experiencing an issue with your SMEG DS96MFA7 oven where a noise occurs after some time of operation and continues even after the oven is turned off. Since you've already replaced the cooling fan and the noise persists, there are a few possibilities to consider:
Heating Element: The heating element in your oven might be expanding and contracting as it heats up and cools down during operation. This can sometimes create noises, especially if the element has developed some internal damage.
Cooling Fan Motor: While you've replaced the cooling fan, it's possible that the noise is coming from a different part of the fan assembly or from the fan motor itself. The noise might be due to vibrations, a misaligned part, or a problem with the motor bearings.
Exhaust Fan or Circulation Fan: Some ovens have additional fans for exhaust or circulation purposes. If your oven has these fans, they might be causing the noise. Check if there are any additional fans present and inspect them for any issues.
Expansion and Contraction: As the oven heats up during use and then cools down after being turned off, various components inside the oven can expand and contract. This can sometimes result in creaking or popping noises. This could include metal components, panels, or other parts.
Loose or Vibrating Components: Check for any loose or vibrating components within the oven. Even a small loose panel or part can generate a significant amount of noise, especially as it vibrates against other surfaces.
Gas Ignition System: If your oven uses gas, the ignition system could be causing clicking or ticking noises as it ignites and heats up.
Electrical Components: Certain electrical components, such as relays or transformers, could also be causing the noise if they are malfunctioning or vibrating excessively.
Since diagnosing the exact source of the noise can be challenging, especially without being able to inspect the oven in person, I recommend the following steps:
Carefully Inspect: When the noise occurs, try to pinpoint its source by listening closely and observing the oven's components. This might give you a better idea of where the noise is coming from.
Contact Professional Help: If the noise persists and is affecting the functionality of the oven, it's advisable to contact a professional appliance repair technician. They have the expertise and tools to diagnose and fix the issue accurately.
I do not no the specific model you have but chances are that the noise you are hearing is the bearings(or brass bushings) are going out in your fan motor. Which in turn allows the shaft of the motor to not remain true and rattles. In laymen's terms, you just need a new fan motor. I hope this helps. "Be Easy!"
From what you describe is happening, I would say that it is the fan that is causing the noise, not neccesserily the oven fan, because there is an external cooling fan as well, and these are the only moving parts that could cause a noise.
Hope this helps.
I had the same problem. The screen protecting the fan bends into the fan from the heat. Take off the top front control panel (3 screws), reach in to the back where the fan is and push the screen back away from the fan. As always, turn the power off first to avoid shock. This should solve your noise problem.