F4 usually relates to a temperature sensor fault. Meaure the temp sensor at ambient temp and it should measure approx. 1K . If it doesn't, then replace. However, and a big however, I've seen frequent faults such as these where the control board is at fault. The proper procedure is to verify the sensor though first before replacing control board.
Rich
Western Appliance Repair
Appliance Repair Meridian
f4 means a problem has occurred with the oven door latch mechanism. Try unplugging the power to the oven and then wait 1 minute and turn back on, this may clear the problem, if not you need to call a qualified service technician for Fulgor products
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