The lower element is defective, either it is burned out (replace) or the relay that drives it is defective, have the same problem here (unless you know electronics you would replace the control board in this case). When the unit is preheating it uses both top and bottom elements to reach temp, in this case the bottom element is not doing its part so it never rises over about ~220. Rest of stove will work fine until this is repaired.
Hi,
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Oven Problems Electric Oven is Heating Slowly or Poorly
heatman101
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