[Mitch Fields]

I have a problem with one of a pair of wall-mounted KitchenAid Pro Line convection ovens. The ovens will sound a beep when they are pre-heated to a specific temperature. My top oven, however, sounds off at a very much lower temp than was set: for example, beeping at say 250 degrees when it's been set for 400 or 475, etc.. The lower oven does not have this problem. The top oven eventually comes to the correct temp (in about 10-12 minutes) and the food is cooked just fine, at the correct time. It does mean I have to set the temp much higher, then when it beeps reset the temp to the lower, desired temp. Oven temp controls have been adjusted, but when the oven comes to the desired temp it is spot on. Any ideas?