A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and.
Replacement gas furnace pressure switch.
Pressure switches are used in a variety of applications.
If the pressure switch is stuck it does not send enough power to the inducer and therefore the ignition sequence does not begin.
If is in the closed position the furnace stops the sequence and goes into lockout mode until the switch is open.
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A furnace pressure switch is a safety device located near the draft inducer motor of a gas forced air furnace.
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.
On newer furnaces on a call for heat the ifc checks the pressure switch.
Pressure switches are used to stop the furnace from operating in an unsafe condition.
Here is a quick breakdown of the steps involved in replacing a gas furnace pressure switch once you have sourced your new part.
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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.
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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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