According to the service manual for this wall oven, the F5 error code pops up when the power to the heating element relays (either the bake or broil element) is disabled while in cook mode. This can happen when one of two things are going on with the oven:
1) Intermittent sensor or wire harness connection.
2) Intermittent contact on power relay board (PRB).
Check the sensor wire harness, undo and reconnect. If the F5 code re-appears, replace the PRB, here’s the part link==> http://www.repairclinic.com/PartDetail/Relay-Board/905230?modelNumber=W30400W
Got a pictorial guide for this job ratcheer==> http://fixitnow.com/wp/2009/05/16/jenn-air-svd48600-range-power-relay-board-and-electrode-changeout-a-pictorial-odyssey/
Not sure that’s the problem? Don’t trust ol’ Samurai? Tell you what: you buy the part through that link and, if that doesn’t fix it, you can return it within 30 days for a full refund, less shipping, even after you already installed it. That’s about as close to risk-free as you’re gonna get!
Samurai Appliance Repair Man