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The main control operates a series of software commands, which control the various features and functions of the oven. Each function or operation has a numerical value assigned to it. The numerical values can be added up - this is called the check sum operation. Every time the system is powered up and after each clean cycle the system performs a check sum and compares the value to the value programmed into the software (stored in memory).
An EEPROM check sum error or FFF code occurs when the values differ. If this happens, replace the oven control board (also called clock or ERC).
Try unplugging the range for about 15 minutes. The ERC (electronic Range Control) may reset itself.
If you still have the fff code on the control it will need to be changed out.
I didn't catch the first line in my first response "Lost power, now oven won't work and display shows..." I am 99.999% sure when the power company restored your power they hit you with a surge that wiped out the low voltage transformer on your ERC (main oven control board). Call your power company and report it. I doubt they will cover the cost to repair but they should! Can't hurt to ask and have them file a claim
FFF
Control Error, Failed EEPROM
Replace Control
You can try a hard reset . turn off the power for 1 minute.. also you can check the connections to the control .. other then that you will have to repalce the control
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