In Gold Canyon, near East Opuntia Path and South Prairie Zinnia Drive performing a dual preventative maintenance service on an Amana condensor/furnace. Cycled system on in cooling mode. Checked volt and amp draws, all are in factory specification. Checked Freon levels; also in factory specification. Warrantied out run capacitor under parts and labor warranty. Acid washed outdoor coil and rinsed. Cycled system on in heating mode. Checked gas and flue piping; both sealed and proper. Checked safety switches, back pressure; shut off working proper. Cleaned burner assembly and removed and cleaned flame sensor. Furnace is working properly. Completed combo service.