Our Cuisnart Toaster Oven no longer toasts very well. It take a long time and barely any toasting is going on. Upon inspection during operation, it appear the upper element are red hot, but the lower one are barely glowing, if at all. It looks like the elements might be replaceable, but havn't found any parts for this oven, beside trays.
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Oven has three modes: 1) oven mode cycles elements on and off to maintain a specific temp setting for up to 60 min. 2) toast should keep all elements on for a few min. 3) broil mode top elements only always on, up to 60 min. Make sure you have dials in correct position and use the toast timer.
The problem is 4 capacitors on the small circuit boards inside. Three 220uf 16V and one 1uf 50v. These apprear to be going bad from internal heat drying them out and they fail. Symptoms include toast will not start when button pressed, or does start but then stops soon after. A buzz or hum heard when the Toast selection is made..(you should hear nothing until the start button is pressed) and the timer beeper no longer working. These are about $2 in parts, and easy for a good electronics person.
I found that the heating element in the top front was burned off at the end. I removed the side cover and the ceramic insulator from the broken end. I then grabbed the broken end of the spring inside the glass tube and stretched it to where I could re-attach it to the connector. It now works after getting it back together. If you attempt this repair, UNPLUG THE OVEN FIRST! There is also a security screw at the bottom of the side cover.
The contacts for these toasters fail. The plasic cam that depresses the contacts also can melt. The design is poor and no replacement parts are available. When selecting a setting, if the selection is not exactly perfect, the contacts arc and eventually fail. Unless cuisinart changes the selection cam to a solid state or relay, this failure will continue to happen during normal use. If your unit works properly do not switch the function setting while heating, this will cause the contacts to arc and erode the contact surface. This posting is applicable to the TOB-30BC, TOB-30BCC and probably all TOB-30XXX models.