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Has the light been cycling on and off?
If it is staying at 75 degrees and the light is going on and off every several minutes then the thermostat needs to be turned up higher.
Ed
One more thing...the wafer has to be carefully threaded on the shaft so that it isn't crooked. It is supposedly easy to screw it on crooked where it does't work correctly.
Ed
Does the incubator have a "power on" indicator light?
If you back the wafer all the way away from the button on the microswitch does does the heating element begin warming up?
If the wafer is constantly pressing against the button the incubator will be in the "off" part of the cycle. To turn...