Hello,
Welcome to FixYa.
Based on your description I'd say the issue actually is with the control...unfortunately. This is likely within the electronic timer/control, specifically the heater relay solder joint. ( a faulty flow switch, ntc or heater can also cause this, but not very probable ).
If you feel capable of checking this on your own, there`s a way to visually inspect the control yourself...it really isn't very complicated.
It will require you to remove the control from the unit and then remove the control from it`s plastic housing and look for a burnt solder contact on the printed circuit board. 
The culprit will 99% of the times be one of the pins from the heater relay,hence the unit sit`s and takes longer & longer to finish because it can`t heat to advance or unless the 2 buttons for "cancel" are pressed...this can also manifest as a long cycle time as I mentioned and eventually display's "1" on units with a display and usually very poor cleaning, no heating ( don't be fooled by the homes inlet hot water temperature ) as a result.
You can also run the unit through a regular or econo cycle ...any cycle with the exception of rinse & hold, and with the door panel removed place an ammeter on the gray/black wire it should draw 11 amps during the wash cycle...after it fills and the flow switch indicates it has adequate water to engage the heater.
i.e. ( this may differ from your specific model, but the same rules apply )
**My Opinion - if you or someone you know is proficient at soldering, a lot of times it can be remedied by simply repairing the solder...but it has to be done well...or it will not last. Bosch recommend`s replacing the control and I don`t pretend to speak on their behalf nor do I profess to know better. This is just my experience (it work`s) and my opinion (why buy new if one can repair ?)
**Please disconnect the power or turn off the breaker before attempting any service to the dishwasher.**
Thank`s for visiting "FixYa" for your repair inquiries. Please take a moment and rate this solution to it's helpfulness. Good luck.
Regards,
Macmarkus :)
Tried but circuit board showed no obvious defects
That was the perfect fix. Dishwasher is up and running. Thank you.
Good Afternoon Tie, thank you for your inquiry!
From what you have described your Frigidaire dishwasher continues beeping a sound every few minutes even when the power has been shut off. It sounds like this could be a possible issue with your control panel or keypad. I would recommend performing a reset on your dishwasher and you can do that by flipping the household circuit breaker off for at least ten minutes. I hope this information is helpful for you. -Matt
Good Afternoon David, thank you for your post!
From what you have described your Frigidaire range your Frigidaire oven shuts off and display remains the same. This could be a faulty control panel or wiring harness. In order to diagnose which component could be the problem you would need to disassemble the range and test each electrical part. I would recommend this be completed by a technician for proper repairs. This will help you avoid any unnecessary part purchases. -Matt
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