Update to code 57

If I remove the vacume hose from the high pressure switch and lightly apply a vacum furnace fires. However the tube this tube is connected to never applies a vacume it is all ways blowing air. Does this seem to indicate a switch or unducer blower problem?

Thanks

If the inducer motor is running its not the motor. You need to check for a restricted exhaust vent on the furnace or holes in your heat exchanger.