Furnace locked out on successive high limit trips Moved dipswitch 1-4 to off position for increased airflow for heating High fire gas pressure set to 3.0"wc temp rise 60⁰ and held steady Low fire gas pressure set to 1.3"wc temp rise 42⁰ Allowed furnace to run for a long time (over 30 minutes straight) Noticed high pressure switch intermittently opening and closing Per Carrier service bulletin, drilled out inducer port with 5/32 drill bit Signed up for silver maintenance Performed heating checks Cleaned flame sensor Condensate trap clear Replaced humidifier water panel and frame with 35EZ kit provided by homeowner Filter is new No concerns with the system at this time