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Service call the Gas Furnace was not working, and we were onsite the previous day for a Maintenance. Upon arrival found unit locked out on a 3 Flash/Pressure Switch Code. Cycled power and measured Pressure across the Pressure Switch. Found unit was not running at a highest pressure and the Inducer Motor was filling with water. Found Drain Line was clogged after the Main Furnace Trap. Cleared Drain Line and found a rubber cap was lodged into the drain. Removed and reassembled drain line. Put system in operation to test.