I am attempting to pre-heat oven to 400 degrees but oven heat will not raise above 100 degrees

possible burner tube blocked if ok check gas pressure from gas valve possible not open all the way

Good Afternoon Friend,

I understand you are trying to reset your Frigidaire wall oven, model# FEB27S5A, due to it not heating above 100 degrees. I suggest resetting at your homes circuit breaker for 3-5 minutes. When you restore power, you will first need to set the clock. After setting the clock, preheat your oven. If you are still noticing that the temperatures are still not going above 100 degrees, I suggest contacting your local authorized technician for further assistance. They will be able to diagnose your appliance and determine what is causing it to not reach the desired temperatures. Hope this is helpful.

-Best regards-
WP

is this 400c or 400f

Hi,
If your electric oven is taking too long to heat or just not heating up right,then check out this tip that will give more detail about your problem.

Oven Problems Electric Oven is Heating Slowly or Poorly

heatman101

We have a new GE Range and the signal beeps at about 100 degrees below the temp which we have set . The dealer replaced the sensor and the control circuit, but there was no change.
A service tech from GE came to our house and explained that the new ovens have a bottom heating element which is covered and therefore heats the lower part of the oven more slowly; but the exposed upper element heats more rapidly and the sensor is located near the upper element. We were advised to wait for about 15-20 minutes after the beep before placing the food in the oven. Judging from the number of comments found online, this seems to be a feature of newer ranges.

SnapDoc

very normal but only during pre heat / once the oven is stable tempt should be 5 to 10 deg above and below the tempt setting and if not replace the oven temp sensor located inside the oven on the back ..mm

has the oven got a fan on it. if so then maybe fan is faulty.
if convection oven then maybe one of elements is faulty
or the thermostat is a problem
regards
richard saupe
Appliance repairman colchester

appliance repairman

Your "Bake" element may not be working properly. It's the one in the bottom of the oven. Place a couple drops of vegetable oil on the bottom pan, and turn the oven on. During pre-heat, you should start to see those oil drops generate some smoke, IF the lower element is working properly. If it isn't - voila'.!! Problem is with the lower element / associated circuit.

could be one of 3 problems: missing 240volts and only have 120volts(one leg out)/bad element(chk for "hot-spot") pitted and discolored-it will soon break there/or the thermocouple is bad that senses oven temp

After it drops temperature, how do you get it back to the desired degrees? It sounds like the thermostat isn't keeping up.