Pressure Switch Failed to Close
While the blower is “on” the pressure switch failed to close.
-Connect manometer to pressure switch. Is differential pressure greater than minimum, replace pressure switch.
-Check if tubing is securely connected to canopy
-Check if tubing is free of cracks or holes or condensate
-Check for blockage in vent/air intake system
-Vent system not installed in accordance with installation manual
-Wind at horizontal vent terminal in excess of 40 mph
-Replace blower
