Upon arrival, furnace is showing code for pressure switch did not close or reopened. Hooking up a manometer to the pressure switch that is not closed is showing 0.0inwc of induction. Inducer is running during induction test. Further investigation shows that pressure switch hose is clogged with debris. Performed cleaning to clear out pressure switch hoses and combustion condensation trap. Excessive debris clogging drain trap most likely lead to backing up in the collector box causing pressure switch José to become clogged. Also inspect3d and cleaned flames sensor due to unit being supplied by propane. Flame sensor is in very poor condition with heave corrosion and soon buildup. Flame sensor appears to be corroded in half. Recommended replacing flame sensor ASAP. Hunter found a dir3ct replacement flame sensor on Amazon that he will be taking care himself. Information on propane tank outside. Twist knob on top of tank turns off propane to the house. With knob open to supply the house wi