Warranty Call Call Back on install. Upon arrival system not cycling heating. System would not ignite. Diagnosis: The gas valve was left in the off position. Flipped switch and furnace cycled through completely. Hooked up monometer and adjusted gas pressures at both 1st & 2nd stage, 1st stage set to 1.75in WC’ & 2nd stage set to 3.5in WC’ HVAC cycled and certified.