The gas oven is two years old. We first noticed

magnetrons work only when the unit is cooking
it smells like an insulation from overheating wire so could be a fuse and failing transformer
take it in for a proper diagnosis and quote but if it is over 2 years old the cost to repair could be more than a replacement unit

I have a Superba built-in YKEBS 177 D56 ( dual convection/convention)...I think it might be about 10 years old. I noticed the same thing starting last year..the temperature seems a litlle off and the cook time on the convention seems to take longer. I've never used the conventional oven so I don't know if the temperature is OK on that component.
I don't have a manual. and I've been searching for it...does anyone know which one I need?
Sorry I couldn't help with your problem, mine is similar to your though!!

What type of Gas do you have?-- Natural Gas?-- or Bottled Gas?
The reason I ask, is that If your gas supply is in a tank,-- the tank might be low..)

If you have Natural Gas, and you suspect that you smell gas, You can call your Natural Gas supplier, and have them check for leaks.

So-- If you know you do not have a low gas tank, then you need to call your utility first.

Mack B

The igniter is probally on it's way out. You will likely start noticing it taking longer to cook or not reaching temp easily. The poof is the gas valve partially opening then the igniter finally ignites it. The flame is usually smaller or yellower.

The problem is usually the igniter not reaching the correct amp draw .When the igniter does not reach the correct amp draw it may allow the gas valve to partially open or not open at all. The igniters are inexpensive and easy to replace. This video will walk you thru the correct procedure for testing an oven igniter. It may be a different model but the testing will be the same.You can also enter your model # for diagrams and illustrations of your specific model. Not all models are available. All parts come with installation instructions.

This sounds like a weak igniter, it would have to be a gas oven and the symptoms usually are: takes longer than normal to ignite the burner, may or may not smell gas in the oven, does not maintain set temperature or burner does not come on fully, eventually won't heat at all. On gas ovens, a glo igniter is like a light bulb, the more you cook, the faster it wears out. Bottom line, needs to be replaced. Good luck.

Replaced the igniter. The parts guy told me that the amperage changes with age and use; thus the igniter still glows, but it takes much longer to operate the gas valve with the reduced amperage. Cost - $70.14

Is the oven working now? test to see if the broiler is working too....if broiler working and oven not you need to replace the ignitor http://www.repairclinic.com/SSPartDetail.aspx?s=t-fgf316-%3d%3di12872&PartID=12872 normally when an igniter gets old it will take a little longer to ignite the gas hence the gas smell.

Might me a bad oven temp. Sensor.

sounds like a bad ignitor, sometimes lighting and not relighting during extended cooking time. dies it take longer than a minute to ignite gas? more then 10 in to preheat? smell gas while cookin?? all signs of a bad bake ignitor

I would suggest looking at how long before the bake burner ignites. If taking longer than 5 minutes before it ignites, then you are looking at a possible bad ignitor. The ignitors just don't last more than 5 yrs with regular use.