It is reading hot because the temp is over its over its set point.Heat relay could be sticking. Contactor could be hung in closed position, element could be shorted.Check to make sure once set temp is reached computer is not calling for heat.Look on control board behing computer make sure the HT light is not on.If it stays on replace circut board.If HT light is off and continues to heat check amp draw on elements.If you have amperage and the contactors are open you have a bad element.
Temp got to hot and shut down high limit. Also check for a broken wire to high limit
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