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The hot surface indicator illuminates when the sensor above one of the burners thinks the burner is too hot. This sensor is built into the burner itself and can't be replaced separately. The range will function normally without any problem without repairing the issue, but you won't know if you accidentally left the burner on or when the cooktop cools down if you don't replace the faulty burner. The burner is usually about $100-150 so it's up to you if you want to fix it or not, but the faulty burner would need to be replaced to resolve the issue.
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