Performed preventative maintenance on a Lennox AC system. Model number: Ml14XC1-048-230A06. Serial number: 1920C18235. Upon arrival the unit was on at the thermostat. I adjusted the thermostat down so the AC would run. Went downstairs to the unit and watched the unit run. Turned the unit off at the switch. Remove the panel to the evaporator coil. Inspected the coils for any dust build up. Poured water into the condensate trap and watched the water drain properly. Poured water into the condensate pump and watched the water pump out properly. Removed the panels to the furnace. Checked the blower motor and fan for any dust build up. Checked all electrical connections to make sure they were properly secure. Changed out the 16x25x1 filter. Placed the panels back on the unit. Took an amp draw of the blower motor. Running within the manufacture’s specs. Turned the unit back on with the switch and watched the unit run. Went outside to the condenser and watched the unit run. Checked the coils f