Checked gas pressure and made a small adjustment to that, and also saw that static pressure was high on the supply side. Found a few supply registers were closed upstairs so homeowner went around and made sure they were all open, she realized that quite a few of them were closed. after opening them 2014 Carrier furnace now runs without tripping high limit. Customer has not done routine preventative maintenance on system so I recommend joining the maintenance plan which customer did.
