Gas Furnace Pressure Switch

20197308 goodman oem furnace replacement air pressure switch.

Gas furnace pressure switch.

It shuts the furnace down if it senses negative pressure created by the draft inducer motor. A gas furnace pressure switch closes to allow current to pass through and start the ignition of the furnace. Sucking on the pressure switch or leaving a pressure switch attached to the furnace when vacuuming out the condensate line will ruin the diaphragm on the pressure switch. This protects your home from dangerous backdrafting which is when exhaust fumes are reintroduced into the system.

Continue reading below our video of the day. As noted above the pressure switches used for gas furnaces are almost always normally open. The pressure switch can be found close to the draft inducer motor which is a motor driven fan designed to move harmful gases including carbon monoxide out of your home and get rid of poisonous gases from the previous heating cycle. If the unit is not drafting properly then it does not operate as efficiently and creates a safety risk by not removing unwanted gases that can make us sick or cause small explosions inside the heat exchanger.

7 a leaking heat exchanger. On newer furnaces on a call for heat the ifc checks the pressure switch. Over time your diaphragm can become coated or stiff which reduces its effectiveness. It is there to confirm the unit is drafting properly.

If is in the closed position the furnace stops the sequence and goes into lockout mode until the switch is open. Gas furnace vent air pressure switch replaces lennox part 104106 01 without new mounting bracket 34 99 34. A furnace pressure switch is an automatic safety feature located near the motor. If your furnace has a leak in the heat exchanger combustion gas is allowed to mix with air in your home or in with the blower motor air.

Pressure switches can malfunction due to age which can prevent accurate readings and result in faulty furnace cycling. A furnace pressure switch is a safety device located near the draft inducer motor of a gas forced air furnace. Pressure switches are used to stop the furnace from operating in an unsafe condition. If the pressure switch is stuck it does not send enough power to the inducer and therefore the ignition sequence does not begin.

The pressure switch in your furnace is used as a safety mechanism. Free shipping on orders over 25 shipped by amazon. The switch is there to prevent the furnace from running unless the correct venting air pressure is present. The diaphragm in your pressure switch is a common location for problems.