Allyn B Lime Springs , IA September 25, 2015 Appliance: Jenn-Air Electric Wall Oven W27400B The oven would not heat sometimes i would get a f5 code i could hear a high pitched ringing but if i repeatly pressed the bake button i could hear the relays engage and the elements started to heat I replaced the relay control board part# AP4098257 Read More... 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes Tools: Nut Drivers, Screwdrivers