I arrived and completed a one system heating maintenance from prior visit. I wasn’t able to get an answer at the door, I called and left a message since it is a package unit. I cleaned the burner compartment,igniter and flame sensor. I checked the amp draw on the blower motor and inducer motor. I confirmed proper flame and sequence of operation. Customer was given 1-20x25x1 filter ,they replace it themselves. The system is currently heating at manufacturer specifications. It started to rain so I was not able to get pictures, I had to hurry up to get the van turned around before I got stuck in the driveway again.