We purchased the replacement glass cooktop, Part #7920P217-60 from you. My husband did the replacement. All the burners work great, but now when we turn on any burner, there is a louder than normal "click" as the fan starts. The fan is much louder (probably 5 times louder)while the burner is on than it was before. We thought the fan may need replacing, so ordered & installed that part, but it didn't change anything. Do you have any idea what could be wrong to cause this??

The fan blades are definitely NOT rubbing against anything. The sound is not like that of the blades, but like that of the motor (more of a bearing sound). It's like a metal sound such as if it's running at too high an rpm. I'm not sure if the fan speed is supposed to be variable, but it almost seems like it's running too fast (even when only the warming burner is on).

The part # 74010173-----could my husband have installed something incorrectly?? He plans to take it apart tomorrow again.

I am somewhat puzzled by your response. The glass cooktop (which is the component that I replaced) has an integrated touchpad circuitry. This connects to the main circuitry board (which was not replaced), which in turn connects to and controls the five burners and the fan motor. I photographed the wiring before any disconnections were made and referred to the photos before making reconnections. There is only one possible connection between the fan motor and the main cicuitry board, because of the reach of the wiring. Likewise the other connections were straightforward, because the reach of the wiring did not allow any alternative connections. The electrical outlet to which the main (and only) power cord of the cooktop is connected did not change in this process. How can the voltage to the fan motor be any different between the original glasstop and the replacement glass cooktop? Is the circuitry in the new glasstop defective? Do I need to purchase a voltmeter to check the voltage entering the fan motor? As I mentioned, I'm rather puzzled by this whole process, since it seemed so straightforward.
:confused:

Hmmm. The fan motor cannot be the wrong part. The original fan motor is original to the cooktop unit, and it worked fine with the original glasstop. It was very quiet. The descriptive information written on the fan motor states "240V 60MZ", and the electrical power supply to the cooktop hasn't changed.

When I replaced the glasstop, the original fan then made the louder sound - metal on metal sound. So, I cleaned the fan motor, but it did not change the sound. So, I thought that the fan motor must be bad, and I bought and installed a new one (the new one has exactly the same descriptions as the original) - same metal on metal sound.

I took the whole unit out today and assured there are no loose internal parts that might be the source of the metal-on-metal sound, eventough I thought this was very unlikely. I put the unit back in, reconnected the power supply, and the fan motor has the same metal-on-metal sound.

I follwed your instruction and I tied the fan motor into a 120V outlet out in the garage and it ran just fine. Slower speed and very quiet - no metal-on-metal sound - and a nice steady breeze. Is there a switch somewhere on the glasstop circuit, on the main circuit board, or elswhere that can be switched. Is the glasstop the wrong part or defective? The only factor that's new in all this is the glasstop with its integrated circuitry.