I have a Goodman HVAC unit model PG036100-1A. The inducer fan does not come on when thermostat is set to heat. Is the fan start the first thing to be observed in the heat sequence? (Red light on control panel is lit.) The unit came on when the gas company turned on the gas back in July - gas had been off for many months. A peculiarity: It appears that the fuse box is receiving only about 56 volts on each side. What could account for this?

Thanks.
McD.