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This means that your oven is not getting the full 220 volts that is needed to heat up the oven. Nothing else would cause the issue. You need to pull the oven out and remove the back sheet metal panel so you can see the junction block where the power cord connects to the back of the oven. If you don't have 220 volts between the 2 outside power wires, flip the breaker off on your house and back on and try again---if you still don't have 220 volts you may need to call an electrician. Other than that if you do have 220 volts, remove the entire back panel and look for a broken or melted wire coming from the terminal block because one of the wires is damaged.
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