2nd Floor : furnace tagged as failure to cycle. Tightened flame sensor bracket. Tested system 3 times, system functioned each time. Heat rise is 25-55*, current heat rise 30*. Diagnostics attached. Tested for leaks with electronic and micro-bubble leak detectors. No leaks identified. Filter was dirty. Filters are undersized for system capacity. 1st Floor : System had exposed ice at piston and frosting at drain line port. Furnace fan motor and blower wheel are extremely dirty. Fan is binding and failing to turn, witnessed this occur twice while I was working on 2nd floor furnace. System will freeze if allowed to operate. System turned off at thermostat. Both systems are drained into singular condensate pump. Condensate pump is not wired into either systems low voltage. iIn the event of condensate pump failure, the systems will continue to operate and water damage will occur to the second floor ceiling.