If is in the closed position the furnace stops the sequence and goes into lockout mode until the switch is open.
Replacement gas furnace pressure switch.
If the pressure switch is stuck it does not send enough power to the inducer and therefore the ignition sequence does not begin.
Lennox pressure switches and carrier pressure switches are two popular furnace pressure switch brands but it is best to purchase based on your furnace model number.
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There are a few things you can check and steps to follow in order to ascertain whether this is the reason why the furnace is not working.
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Pressure switches are used to stop the furnace from operating in an unsafe condition.
Generally they are a normally open switch that closes with either a rise or fall in the pressure it is monitoring they are used mostly as a safety device but are also used for operation control such as fan cycle controls for low ambient cooling starting and stopping for steam boilers and the list goes on.
The switch is there to prevent the furnace from running unless the correct venting air pressure is present.
A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and.
Pressure switches are used in a variety of applications.
A gas furnace pressure switch closes to allow current to pass through and start the ignition of the furnace.
On newer furnaces on a call for heat the ifc checks the pressure switch.
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If you believe that your gas furnace is not functioning as it should be then it could be the gas furnace pressure switch that is causing the problems.