Oven emitted black smoke and F7 beeping on display

Your oven is one of the most-used appliances in your home, and when you use it for preparing strong-smelling meals, like fish or for curing jerky for instance (I speak from experience on the latter), you can be left with an oven that emits bad smells into the rest of your food for weeks on end. You have a spill in the oven. Wait until the burners are cool to clean them only with warm soapy water (no chemicals) and clean inside the oven. Like a self cleaning oven, it's only at high degrees it will "burn" off the food spills and will cause smoke. Shop Appliances and Furniture for your home from Appliances connection online store.

Somethin's burning.
Get a gasfitter to check air/fuel ratio and,
well,
clean the oven...

Typically an oven beeps when the interior temperature macthes the temperature where you set the dial. This is an audible signal to that fact and particularly helpful when you need to pre-heat the oven. For example it you want to cook something at 350 degrees, you set the dial at 350. When your oven reaches that temperature it beeps to let you know. Some cooking directions tell you to preheat your oven. In that case, when you set the dial to 350 and wait for the beep...you know you are safe to start your cooking process because the oven is now pre-heated to the temperature you set. If your recipe requires a pre-heated oven, and you don't wait for the beep, your taking a guess at what temperature you're cooking your food. Additionally, if you want to know what the internal temperature of oven is and your oven is heated...you simply turn you dial setting and listen for the beep. Again, if you set your oven at 350 and you want to know how hot your oven is... slowly turn the dial setting. If the oven beeps at 275 then that's how hot your oven has gotten. To let it finish heating to 350 just reset the dial and wait for the beep.

I will give you the meaning of the error codes and possible solutions.

F3 Open Sensor circuit, Open (blown) sensor fuse or bad sensor.
More than likely, you have a oven sensor that needs to be replaced.

F7 Problem with the keypanel, possibly, a function pad button is stuck.
Attempt to clean and unstick button. If this fails, you may have to replace the
keypanel.

I hope this helps you

When the oven gets dirty and you don't run the clean cycle, dirt builds up and burns away the hotter the oven gets. Run the clean cycle if you have a self clean mode on the oven. throw the metal burner and grates in the oven too. (no plastic) open a window because it will stink and it takes a few hours to run. If not, use oven cleaner then run the oven to the hottest temp for at least 1-2 hours to burn the old dirt out..
Good Luck, Bill

Sounds like you need to clean the whole oven as old grease and spillages will keep on burning and smoking.

i would have to say that there would be a problem with the ignitor and control regulator

Try to set it at 500 degrees and see if it goes off at 350. If it does, then it probably needs calibrating. You can calibrate it by taking the knob off and finding a set screw in the stem where the knob sits. If this is not the problem, you may have to replace the thermostat. By the way, check to see if your temperature probe is not touching the wall of the oven. It will give it a false reading. Let me know if any of these things work and we will go from there.

Could be a couple things. If your machine is actually failing either a control board or an oven sensor.

Also measuring the temperature can only be done by a tech unless you have a special tool. Oven thermometers are inaccurate. Plus most ranges should vary temp between 50-75 degrees unless has a feature or the more recent ones keep it between 15-25 degrees.

Try the biscuit test, buy some biscuit, brand not important, i just say pillsbury. Cook exactly as recommended on package. If results are a little overcooked or a bit undercook try a feature called Adjusting the oven temperature or Calibrating the oven. This can be done by following the instructions in your book.

Maytag.com click support click manuals put in model MER5775QA (notice i took off your models S) open the Use guide, page 14

Pull the bottom of the oven off. You will see 2 to 4 screws that hold the panel on. The ignitor is under there. Look at the ignitor carefully for breaks. I say carefully as the ignitor is very easy to break.