Performed furnace maintenance on a 2008 Goodman furnace. System started up good. Customer has a Nest Pro. Duct runs are sealed. Heating temperature split is in range at 45. Filter was changed with a customer provided Merv 16. Flame sensor was cleaned. Sensors and switches were tested for correct operation. Blower wheel is not too dirty and spinning well. Motor is free from any leaks. Battery cap is good. Condensate lines are clear but has no overflow switch. Inducer motor is amping in range. Ignitor was measured and recorded. Homeowner is aware of the risk of not having any overflow protection. System was operational at end of appointment.