the pressure switch is open and not proving the ventor motor. Or you test any Voltage between 1 to 23 Volts then you have bad contacts and the full power is not getting through causing the furnace to fail. On a few furnaces I have found the ventor motor seams to be running fine and ...
5520533Apparatus for modulating the flow of air and fuel to a gas burner1996-05-28Vrolijk 5408986Acoustics energy dissipator for furnace1995-04-25Bigham 5347981Pilot pressure switch and method for controlling the operation of a furnace1994-09-20Southern et al. ...