Check that the thermostat probe inside the oven has not been moved to close to the upper bake element, if ok check both top and bottom elements work by turning oven on in bake position and carefully feel for any heat coming from them both if good then faulty thermostat
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Check that the thermostat probe inside the oven has not been moved to close to the upper bake element, if ok check both top and bottom elements work by turning oven on in bake position and carefully feel for any heat coming from them both if good then faulty thermostat
Sounds like you may have to replace the heat sensor.