Lubricate blower and motor bearings (if equipped).
Check belt condition and tension (if equipped).
Install clean air filters (1″ disposable fiberglass filters provided).
Check that furnace flue is venting properly.
Adjust burner for proper flame (as necessary).
Check condition of pilot; clean (as necessary).
Check gas line pressure.
Check manifold pressure.
Check condensate if necessary.
Check fan and limit control.
Check pilot safety.
Check pressure regulator.
Check burner operation.
Check safety controls.
Check temperature rise.
Check fan speed for winter operation.
Check inducer motor operation (if equipped)
Check blower motor operation
By having an older system covered by warranty service you are preventing a “NO HEAT” emergency later. A service call done after hours or in the middle of the night can run as high as $245.00 just for diagnostic. If a service technician finds a potentially faulty part during an annual maintenance you are saving yourself $245.00 in labor costs alone that could have been incurred had the system failed later that year.