Our integrated oven has tripped the house mains box. When I reset it the oven has power but the main oven does not work. No heat light indicator, no oven light but fan is working, top oven works ok. What is the usual cause? Oven was on high heat setting (250) when it blew.
Knowing exactly what you mean by "tripped the house mains box" will help narrow the possibilites. Do you mean an overcurrent mcb, the earth leakage RCD or both??
As you have no heat light or oven light it suggests there is an internal wiring fault. Inspection is really the only sure answer.
A blown element would not prevent the light and fan from working. As another fault has occurred, it appears to be getting worse. Albeit very small this type of fault could cause an increased risk of shock or fire, it would be wise I think to stop using the oven until the fault has been identified.