Broken Bottom Element

You bottom element is probably cracked or broken and will need to be replaced

Since the element is not open, the trouble is in the thermostat or the switch for that element.

check thermostate control sensor its locate behind the heating element. check continuty .if its fail .replaced correct value.
GKM

Check for a broken wire or even broken element on top and bottom of unit. To do this, the unit must be unplugged or otherwise removed from power completely, then remove the screws that hold each heating element in place and gently pull out and inspect the wire connections. You should have just enough slack to check them. There should also be just enough slack to strip the wire clean to make the new connection to the heating element.

If the repair has been done before, you may need to fish a new lingth of high temp wire into the location.

It seems that the control board is faulty. You would need to get the board repaired since it is no longer available for purchase from the manufacturer. You get the board fixed from www.partsimple.com at the lowest price compare to the rest of competitors online.

Here is the direct llink to the control board: http://www.partsimple.com/318010102-frg-r-12.html
Frigidaire Range Control Board Repair Service 318010102

Unplug stove and remove screws holding element to oven cavity. Remove and take to nearest appliance shop and they will match up for you. Not an expensive repair. Hope this helps.

You need to replace the oven fan element, as there is probably a seperate element in use when used on convection heat.
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Thanks.

I just found out my baking oven doesn't work and I hear the fan for the convection roast, but no heat. I had the appliance man out and he said that I need a relay board! Big bucks and they don't make this model anymore. Moreover, the microwave and warming drawer work fine. This is ridiculous!

Trying to better define the problem....

Do you have any cuts, holes or "shorting" or tin-foil/aluminum around your bottom bake heat-element? If so, you may need to replace the baking Heat Element. (Ensure you do not use aluminum foil around your heat element to prevent your oven from getting dirty)

To replace your baking heat element, with power off; remove 2 screws securing the bake element. Slightly tug and pull towards you for about 3 inches or so and disconnect the connecting wires at each end. Then completely remove the heat element and install new in reverse manner. Whats' you're model number?

i would know them if i were looking at it but hope this helps
line at top - top element only
line at bottom - bottom element only
line at top and bottom - conventional oven ie top and bottom elements on
wavy line - grill element
pic of fan - fan only with no heat
pic of fan with a line as well - fan oven

youi may not have all of these depending on oven.
best to use i find is fan oven - i do a lot of cooking!