Brushed and vacuumed flu pipe and heat exchanger Replaced oil filter, nozzle, and strainer Checked all electrical connections and safeties Preformed combustion and smoke tests 6.8%o2 50ppm co 0 smoke Upon arrival unit burner would fire up but no blower. Turned blower wheel manually and the blower started indicating a dead spot in the motor. Replaced blower motor and tested operation to ensure polarity was correct. Unit is working properly