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Re:A man feeding a remote Alaska town with a Costco card and... by ars on Monday May 04, 2020 @01:04AM (#23064738)
> but the temperature flux up/down

Have you checked if your air vents are blocked? Ovens don't have adjustable fires, they are always on/off.

I can't think of any kind of failure that would cause unusually high swings.

Re:A man feeding a remote Alaska town with a Costco card and... by adrianN on Monday May 04, 2020 @01:40AM (#23064911)
When the temperature sensor in caked with something that provides thermal insulation the resulting lag in temperature feedback would mess with the oven's temperature control.