Silver club furnace tune up on 80% Carrier gas furnace. Checked filters and customer just changed them at beginning of month. Checked and changed customer supplied batteries. Cleaned flame sensor. Checked blower, blower capacitor, heat exchanger and coil. Cleaned out debris from flue base. Checked inducer wiring and hoses, and tightened connections. Cycled system on and checked gas pressure, heat rise from coil to filter base and amp draws. System working well at this time.