Sue:
Seems that someone tried to wire it and didn't know what they are doing!
I'm no electrician either, but if there is a switch soley for the fan it should not have the bulb or heating element wired to it. You can simply see if the fan is on. The light should be tied to the 1. Switch and 2. Thermostat which is essentially the same wiring as the heating element. When the thermostat shuts off the heating element it would shut off the light.
Again, I have never wired an incubator with 2 switches.
Seems that someone tried to wire it and didn't know what they are doing!
I'm no electrician either, but if there is a switch soley for the fan it should not have the bulb or heating element wired to it. You can simply see if the fan is on. The light should be tied to the 1. Switch and 2. Thermostat which is essentially the same wiring as the heating element. When the thermostat shuts off the heating element it would shut off the light.
Again, I have never wired an incubator with 2 switches.