Oven tempeture lower than setting by 100 degrees on 350. even after pre-heat cycle. slightly more accurate at higher temps. i have a regular oven thermometer to check it. it was working well until recently. frigidaire fgf366ebc

is this 400c or 400f

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

If you are monitoring the oven temperature with an analog style thermometer you may actually be ok, but seeing the thermometers slow reaction time.
Some newer ovens actually do pre-heat beep prior to reaching temp in an effort to conserve eelectricity.
A good home test is to try your oven at several different temps to see if there is any variation in internal temperature. Try it one day on 300, the next at 375 and another day at 450. Give your analog style thermometer time to catch up (usually just about 15 min) and leave it on for a half an hour to see if the temp maintains.
Also Beware of aluminum foil AND THE NEW OVEN LINER MATS as they can alter oven performance bay absorbing and blocking the ovens natural heat radiation and convection air flow currents that happen in all ovens, not just convection models.
Another interesting fact is that older ovens used a thermostat in them that operated much like your thermometer and was very slow to react making the oven typically about 100 degrees hotter than where the customer set it. This was just a fact of life before the advent of electronic temperature management and became noticeable when people began trying to bake older "hand me down" recipes in the newer ovens with less than stellar results.
You can mimic the older oven performance by preheating the oven about a hundred degrees higher than called for and after it reaches temp, re-set it to the correct temperature and put the items in right away.
If you find your temperatures fluctuating ask your servicer to replace first the temp sensor and as a last resort the control board as this part is usually pretty expensive.
Good Luck with this!

change temp control

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

Hi, It very well could be the ignitor. Sometimes they work at first and then will not open the gas valve later in cycle. You can set the oven to heat and watch the ignitor. If it glows and the gas will not ignite in 30 to 45 seconds, the igniter is getting weak. I jope this helps.
Please let me know if I can assit you further.

Vic

yes it is normal . but i know your not the first to think its not , todays ovens are so tight , it only takes 10 seconds of heat to keep them at proper temp . it used to be that ovens where kept at a 3 degree sweep that is set at 350 turn on and up to 353 then off ,cool down to 350 and back on . this was a longer time off and a longer time on topday we keep to 1 degree ! 350 on to 351 off to 350 on and so on ....... so short berst of heat make for a more even oven ........ but i know i hate it too ! good luck

You may not need anything. Most people test their oven with a dial type oven thermometer. They are slow to react and often not very accurate. When I test an oven or install a new thermostat, I use a digital thermometer with a remote temperature probe, hanging from the center of the oven, which shows the temp in tenths of a degree. I let the oven cycle on and off at least three times, then take the high and lower readings on the next cycle and average that out to see what the actual oven temp is. Most of the time, if there is a dial type thermometer in the oven it is very slow to react. After 3 to 5 cycles, they often show close to what the actual oven temp is, but the only way to know for sure is to use the more accurate digital thermometer. Most ranges with digital displays can be adjusted + or - about 35 degrees. Check your users manual for this info, but don't mess with it until you have checked the oven with a digital thermometer! Please don't bother rating this solution, as anything but a Fix-Ya drops my score. Thanks.

The 350 as you stated is a default set point that you see before you start the cycle. What you should see afterwards (start bake) is the current temperature - which would normally be lower than the set or desired temperature - it will eventually get there

Regards

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