Tech found furnace operating whilst showing a code of an open pressure switch. The pressure switch IS closed. The pressure switch is closing at .70iwc the inducer motor is pulling 1.35iwc . The unit is operating at this time. An incorrect fault code is indicative of a failing furnace control board. This unit needs a door for the furnace filter that’s under the floor. Unit has T6 Wi-Fi thermostat. Customer needs to be notified tomorrow about warranty status as supply house is closed already.