Arrived to do a dual system performance maintenance. Set each system for cooling. Measured the each systems static pressure measured a temperature split between return and supply air. Checked interior of the furnaces for cleanliness. Went outside and verified refrigerant levels for each separate system. Verified operation of all electronic and mechanical components. Found that the condenser fan for the main system has a delayed startup signaling a failure in the motor its self. Rinsed coils free of debris. Spoke with homeowner about the systems. Air conditioning systems are operational at this time.