When the furnace finishes a heating cycle often the vent inducer will continuously cycle on and off. This doesn't seem to interfere with any subsequent calls for heat. I've measured the voltage at the pressure switch and I read 24V at each contact during a heat cycle. I read zero volts on one during the cycling and near 24V on the other. Of course this isn't a constant 24V since the power is cyclic (on/off/on/off). Can anyone offer some help here?