My oven fills with steam and I can't bake cakes etc as they retain too much moisture

SOURCE: Kenmore electrical oven

Trying to better define the problem....

Do you have any cuts, holes or "shorting" or tin-foil/aluminum around your bottom bake heat-element? If so, you may need to replace the baking Heat Element. (Ensure you do not use aluminum foil around your heat element to prevent your oven from getting dirty)

To replace your baking heat element, with power off; remove 2 screws securing the bake element. Slightly tug and pull towards you for about 3 inches or so and disconnect the connecting wires at each end. Then completely remove the heat element and install new in reverse manner. Whats' you're model number?

SOURCE: How to set the temperature on the KitchenAid Superba oven/convect

A separate oven thermometer is absolutely necessary in baking. Something similar to this would be cheap and easy. http://www.bedbathandbeyond.com/product.asp?order_num=-1&SKU=10161738

Or you could go for a digital one with a probe.

SOURCE: KitchenAid Oven Temp.- Bottomside of Pizza or Cake stays uncooked

I have a 2yo Kitchenaid oven, and my advice is first, don't use convection for cakes or pizza. Use the thermal oven. For pizza preheat to 500 degrees, then put the pizza on the lowest rack, and bake for 7-8 minutes.This way the bottom browns, and the top doesn't get broiled from the top element coming on during the bake cycle.

As for cakes, again place them on the low rack so that they get bottom heat. I keep my eye on the oven and when the broil element comes on I stick a piece of foil over the cake until it goes off. Otherwise it will set the top and the cake won't rise as much. Even doing that cakes don't rise as much as they did in my old oven, and they brown too much on top.

The convection oven does a good job of cookies, and the broil mode is okay.

I wish I hadn't bought this oven, but I didn't know about the upper (broil) element coming on during the bake cycle until I'd had it for awhile, and it was too late to return it.

If anyone's shopping for an oven, ask questions, and don't get one that maintains the oven temperature by activating the broil element when baking.

SOURCE: OVEN NOT BROWNING CAKES

put dynamite in container. if it blows up, too bad

SOURCE: When set to bake eg: 350 degrees the audio alarm

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!