Nn2909/nn-2959 both cooktop bulbs blew at once! Changing bulbs does not correct problem. Is there a fuse somewhere? Any way I can fix this problem?

o determine the specifications for the varistor to replace the one on your Iwatani induction cooktop, you will need to know the voltage rating and the maximum current the varistor can handle.
One way to determine these specifications is to check the datasheet for the original varistor, which may be available from Iwatani or the varistor manufacturer. If you cannot find the datasheet, you can try measuring the resistance of the varistor with a multimeter, which can give you an idea of the voltage rating. However, keep in mind that the resistance may change as the varistor ages or if it has already failed.
Additionally, you may need to know the peak current that the varistor can handle. This information may be available on the datasheet or on the original varistor if there are any markings left. If you cannot determine the peak current, a general rule of thumb is to choose a varistor with a maximum surge current rating that is higher than the maximum current that the circuit can deliver.
It's important to choose a varistor with the correct voltage rating and peak current handling capability, as using an incorrect varistor can potentially cause further damage to your induction cooktop or pose a safety hazard

Full make and model are useful in such questions. Answer deleted.

It is fused through the house breaker box.

make sure the power is off and unscrew it with long nose pliers

when they stop working it blew a fuse or the controler went

Call the service tech it;s under warranty and, this model is notorious for this fault

There is no fuse on the unit. I suspect your house circuit is blown. If not, then a wire may have burnt off. Hope this helps!

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.

Pull the unit away from the wall and inspect from rear. However, if all is fine, perhaps you simply overloaded the circuit that once. Were you running any other appliances (overhead microwave) at the same time?

What do you mean you 'placed container on all five knobs'?

Apart from that it sounds like you have a faulty lead, or the contacts inside the unit have short circuited. This is the only thing that could be causing a continuous circuit and tripping the fuse.