Watchdog error? Jenn Air Downdraft Range F5 error SVD48600B

[remedy510]

Older downdraft. Panel wouldnt light up, but did beep. Changed touchpad and board that attached to it. Control now functions, but as soon as I try to bake, F5 error comes up. I found a site that suggests older JennAirs F5 means 

Hardware and watchdog circuits disagree

Rebuild clock assembly (also called the ERC)

Considering its a new clock (i assume is the board behind the panel I replaced), then could it be one of the boards in the back? Theres a downdraft board 12001694 and a bake/broil board w10757086. Any guidance would be greatly appreciated as this is getting expensive!!

[Hiroshi]

F5 is indeed the watchdog circuit error, meaning the processor is not getting the signals it "expects" from the oven for the cycle it is operating in...First, I would test your temperature probes to be sure they have the proper resistance, as they are the way the logic board "decides" if things are in order. A bad or loose connection can make the probes resistance value to "appear" to be much higher and, therefore, way out of range. 

On the main power relay board: J10 connector goes to the Upper Oven sensor probe (2-pins) and J9 goes to the Lower Oven (2-pins) if the unit is a double oven. Should read @ 1100 ohms at room temp. Check for cracked solder joints on the relay board as well. .R25RelayBoardIllustration0290_001.pdf

Generally, It is best to send the display head and main relay power board off to be refurbished together, so they can be tested together- CCS does them for 180 dollars + shipping and gives a year warranty on the repair. The display/relay board on this Jenn-Air is very similar to the set of boards on tons of Thermadors out there...

[remedy510]

Ok very helpful. I'll pull it out and see what I can find. Thanks!