Upon arrival thermostat was reading no power from hvac equipment. Inspection of furnace showed that it was not on. Checked to make sure breaker and service disconnect were on. Took off bottom door and inspected for any loose wiring. Manually pressed in the door switch and system came on. Door was not on properly and not depressing the door switch. Put door back on and tested operation. Furnace came on in heating as it should. Gas pressure sounded high. Checked gas pressure and it was at 3.8inwc. Set to 3.2inwc to ensure system does not overheat. After installing the top door back on, the system ran for approximately 20-30 seconds before being snuffed out. Inspected outdoor termination for concentric vent and found thatca grill was blocking the vent and causing recirculation. Moved grill and test ran system again. No other issues found or suspected during test runs. Pvc flue vents are installed properly, and pvc drain line is installed correctly to the adjacent drain setup.
