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hello after looking at your wiring diagram the only thing it can be is a blown breaker in your home. half of it works off 120v of the 240v circuit and the heating elements off the other 120v line. so you are only getting half the power to your unit. turn the breakers off and on see if maybe it just tripped.but its not the cooktop. hope this helps please dont forget to rate me thanks ken
there is a short for sure, sometimes when the heating element burns out and melts, it touches the metal inside the housing causing a short. inspect the heating elements in the oven(top and bottom). the loud buzzing sound is what a shorting out heating element makes as it melts like a weldin rod, usually because of using tin foil(not recommended)
Confirm there is 240 VAC powering the unit (make sure a breaker has not tripped or a fuse blown.).
Did the burners ever produce enough heat?
If yes, then we can look deeper. If no, then the burners may not be adequate for your cooking style. Burners are like light bulbs. A 60 watt bulb will put out more light than a 40 watt bulb. A 100 watt bulb will put out more light than a 60. Typically, a small burner will provide less cooking heat than a large burner.
It sounds like you have lost 1 leg of 220V power to the unit. Chances are, one of the elements shorted to ground, then blew itself open.
Find the breaker or fuse box, and reset/replace breakers/fuse. If it blows again, you'll have to locate which element is bad, or where the short is.
I can help more once I know if there was a breaker trip, or fuse was blown. I will also need to know if it is one element, or all the elements., that exhibit the same problem. I can instruct you on identifying the bad element as well, and replacement elements are available.
the unit doesnt have any internal fuses. you have a house fuse blown or circuit breaker that tripped. the fan switch can be found online or from your local parts house and make sure you get the clips to hold it to the mounting tabs. next time you get ready to work on it, just make sure and turn off the power first as you will touch the metal terminals to the frame again.
youl have to pukk out the unit and check the connection/installaiton. youll need to determine if you have proper voltage going to machine. ther if no fuse on the machine, more than like a power supply issue
Try looking at the junction box that it is connected to. Maybe one or more of the wires have burned off or come loose from the wire nuts. How many amps is the breaker? Most electric codes require separate circuits (Breakers) for each appliance. First turn off the breaker. There should be an outlet box of some kind on the wall or behind the cabinet. Follow the wire from the cooktop and see where it goes. Open it up and check if any wires are burnt or loose. If it was installed wrong I would change it. Most cooktops shouldn't be fused at more than 30 amps. Single ovens the same, double ovens up to 45 amps. The problem is if they used an old range outlet with 6 gauge wire and tried to connect both appliances to the same wire. This is hard to do without it coming loose.
Andy, sounds like you lost a leg of power. Check the breaker box first. Maybe the contractors tapped an existing breaker instead of adding one for the burner/broiler. You would have to check the terminal block on the range. Should read 120V from each end to center and 220V across the two outer terminals. If you don't have this, something got messed up with the contractors. Catriver..post back