I have a Generac portable generator, 15kW, model 004582, purchased in 2003. The generator has always been able to power two Carrier furnaces and most electrical appliance in the house with the exception of the microwave ovens. The light comes on and the display works but the magnetron doesn’t seem to energize in both ovens. Even though the ovens are different brands and different sizes, they never worked while on generator power.
Recently the blower motor on one of the furnaces seized up and subsequently took out the control board. Carrier service replaced the motor and control board and everything worked normal.
About a week ago we lost power and had to run the house on the generator. The furnace with the replacement motor and control board would not run on the generator. The blower motor would not come up to speed.
I had the generator checked by a Generac authorized service and they said everything was ok.
Voltage: 240 AC
Frequency: 59 - 60 Hz
THD%: 4.6 - 6.0%
I am at a loss to figure out why the furnace that has the replacement parts won’t work with the generator. I have seen where some people say it’s because there is a floating neutral on the generator, the neutral is not bonded to ground like with utility power. Others claim the control board is super sensitive to frequency of the incoming power.
I am wondering if anyone else has had a similar experience or suggestion on how to trouble shoot this problem.