When the oven is on for a couple of min. it makes a bang sound

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.

I too have the same KCO223 countertop toaster oven, and the toast function is not working. All other functions work fine, but the blue light won't come on in the TOAST mode setting.

You cannot find this part anywhere! I contacted the factory that makes them in China. They won't sell you one. Minimum order is 5,000 parts. I told them I was interested in a large order and asked if I could get a sample switch. They sent me 3 of them for the cost of shipping!!!!

Your problem is very likely the timer switch. They are very poorly made and they have a high failure rate. B&D should have a recall on these switches. It's likely a DKJ/1-60 timer switch. They make a very poor electrical contact which causes the switch and possibly the wall plug to overheat. Mine melted the wire insulation at the switch and failed. These switches are impossible to find fortunately because they are all subject to the same failure. There are a couple timer switches made for Delonghi ovens that will work in the B&D and other ovens that use the DKJ/1-60 timer switch. One is part # 5218104600 which works the same as the B&D switch but it only has about a 13 minute toast timer. Turn it counterCW to turn the oven on. There is another switch with a 120 minute timer which is part # 5218101800 but may be harder to find. The 13 min timer switch can be purchased for $10.98 at Gourmet Depot website. Another solution is to replace the bad switch with a single pole single throw toggle switch rated for 20 amp's at 120 volts AC. You will no longer have a timer and you will need to turn the oven on and off manually but at least you will be able to use the oven and the switches are under $10 and much safer than timer switches.

It sounds like you have the same problem as the Oster 6248 typically develops. The fix is to avoid ever buying anything made by Oster again, because it's all the same ****, made in China, just more overpriced.

I'm afraid you are screwed, because this is the usual failure scenario for this model. Mine just failed the same way, and it's only a couple of years old. I would avoid buying anything Oster in the future, because it's all made in China nowadays. Check out the reviews on this model, and on the 6058, on Amazon. Some people are reporting that the new model is a fire hazard as well.
If there are any good models coming from any other part of the world, I'd be interested in getting one. If you have any companies making such things in South America I'd definitely recommend supporting your local economy. The USA does not make toaster ovens anymore at all, apparently.

Top dial is Bake/Broil knob, it goes left to right. Starts with OFF @ 9 0-clock next is 100 dgre then @12 o-clock 180 Deg. is at top center next is 250 Deg. next 350 located opposite of off. Next @ 4 o-clock is 400 Deg. Next @ 5 o-clock is 450 Deg. and finally at the bottom at the 6 o-clock position is BROIL. The Center Knob is BAKE TIMER . Starts @ off position as 0, next @ 10 o-clock is 10-mins. Next @ 12 o-clock position is 20 mins. Next @ 2 o-clock pos. is 30 mins. Next @ 3 o-clock pos. is 40 mins. Next @ 5 o-clock pos. is 50 mins. Next and finial pos. is 60 mins. The Bottom knob is TOAST @ the 9 o-clock is is 0 next @ 11 o-clock pos. is Light , Next between the 12 & 1 o-clock pos. is MEDIUM and the final pos. @ 3 o-clock is DARK. TOAST.

YES YOU ARE your trying to bake something in a toaster oven :) toaster ovens have two modes toast /bake in this mode top and bottom elements get hot .and broil in this mode only the top elements get hot . the problem is the marketing the word OVEN makes you think of a normal oven that the bottom elements do all the work . toaster ovens work well melting stuff and toasting . thats about it . if you must bake in it try placeing a sheet of foil on top of your baked goods it might insulate the top of you food . good luck ... if this answer helped please rate it a 3 or 4 stars , this high rateing will help keep me in the paid answer department , thank you

WELL I FOUND THEM BUT . your timer and over where made in china . the people that made the oven sells no parts the timer people will sell timers but the order min $1000.00 per order . there where no part orders in there history , so what i get from that is there are NO timers sold for parts on the globe ....

Finally found a link. I've been looking for months, all the links 'where not found'. Hope it works for you.

http://dl.owneriq.net/0/0adc711e-85ab-4238-a68a-19394579d13e.pdf