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Are you getting an error code on control board?
You should have a control board in blower compartment that will flash to tell us what failed.
OK the pressure switch is opening when it should stay closed
This can be caused by the following:
2Cracked or loose hose between switch and inducer
3.Gasket on inducer leaking
4.Dirt or debris in hose or fittings between inducer and switch
5.Water in hose between the inducer and switch
6.Deteriorated blower in inducer
7. Defective pressure switch.
Switch has to be open for inducer to start, then inducer has to draw a vacuum on switch and keep the vacuum entire heating cycle,If vacuum is lost burners will not light or will shut down.
Remove hose from inducer.leave attached to switch. Allow inducer to start, suck on hose keeping a vacuum on switch and see if furnace will stay on.
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Board says pressure switch is opening.If you know for sure pressure switch is staying closed, may be bad connection or bad board not sensing it closed.Do you have a meter
Have you verified switch is staying closed when we get the error code and it shuts down?
So does board sill show the open pressure switch code with it closed?
Check the connection at the board.Unplug push wires into connector good and reconnect and see if it will stay on
I am going to open to other experts who may have ideas,Sounds like maybe a failing board, but hate to condemn board without being onsite.
Hello, I am a different tech and have run into this issue numerous times on that unit. You need a new board for sure and will be good to go!
We are on the honor system for our time, all I ask is please rate my service using the STAR RATING LINK on your page before you leave. If you are not happy with the service please let me know before leaving a negative rating. This is the only way I am paid or credited through the site for my time. This will also allow you to get directly back to me for FREE follow up questions and tips are greatly appreciated! Thanks
You just need a new board, after a rating you can get right back to me for any followup questions or a refund if needed without issue! Get the board and you will be good to go.