Upon arrival, I found the system was tripping on the low pressure switch via the thermostat. I hooked up my gauges and confirmed this. I grabbed my leak detector and went into the attic to perform a leak search. I found that the blower motor is locked up enough to cause it to not operate. The blower is on order and will come in either Wednesday afternoon or Thursday. The clean air effect works off of static pressure and with the blower down I can not investigate why it is not operating.