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A furnace pressure switch works by detecting differences in air pressure. If the proper air pressure differential is not maintained, the pressure switch prevents the furnace from operating. More »

www.reference.com Home & Garden Heating & Cooling

A clogged condensation drain can trip the furnace pressure switch because it senses the accumulation of fluids in the furnace drain pan. A switch stuck in the open position prevents the furnace from turning on. Water sit... More »

www.reference.com Home & Garden Heating & Cooling

The furnace pressure switch shuts down the furnace if the unit has improper air pressure caused by venting issues. Potential causes of pressure change that signal a problem include leaks, restrictions in the intake air v... More »

www.reference.com Home & Garden Heating & Cooling
similar articles

The furnace pressure switch shuts down the furnace if the unit has improper air pressure caused by venting issues. Potential causes of pressure change that signal a problem include leaks, restrictions in the intake air v... More »

www.reference.com Home & Garden Heating & Cooling

A furnace pressure switch detects the venting pressures within a heating and ventilation system and is not adjustable to different pressure levels. The switch prevents the operation of the furnace if the appropriate vent... More »

www.reference.com Home & Garden Heating & Cooling

A clogged condensation drain can trip the furnace pressure switch because it senses the accumulation of fluids in the furnace drain pan. A switch stuck in the open position prevents the furnace from turning on. Water sit... More »

www.reference.com Home & Garden Heating & Cooling

According to Energy.gov, a high-efficiency furnace works by condensing gas in another heat exchanger, yielding a more efficient system. A furnace with high efficiency also has sealed combustion for better performance, an... More »

www.reference.com Home & Garden Heating & Cooling