have a comfortmaker m#fsm4x24 fan coil,not getting 24 volts back out oif sequencer,these have a rectifier built in to them similar to what carrier did a few years ago is there any other reason other than failure if sequencer that would cause this issue.they have a really bad schematic that doesn't show any components of the heater itself and I can't find one online either... any help would be greatly appreciated.