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I am sorry to hear you are having trouble with your appliance.
I understand how frustrating that can be.
These issues usually occur after power surge.
Please leave the oven completely unplugged for around 50 minutes.
Then plug it back and reset the clock.
It should work however, if the issue is still there then I am afraid the clock control is faulty and will need replacement.
I hope this helps, please do not hesitate to ask any follow up questions.
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