Contacted resident Checked thermostat, resident was concerned Thermostat is ok Replaced filters Went to roof Cleaned electric compartment Checked heat exchanger, good Checked all wiring, good Checked temperature rise rated 45-85 Found manifold gas pressure to high It was 4.1 unit rated 3.5in wc Adjusted to 3.5 Temperature rise Supply air 122 Return air 74 Rise of 48,good