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Can you please give me model on furnace so I can give answers and guidance specific to your furnace?
Model will be on a label just above burners on right or left inside panel
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That issue means that there is a pressure switch error when the inducer motor starts to run it pulls a vacuum through the rubber tube attached to the inducer blower housing. Check that port for any blockages. Pull off the rubber tube and see if there is anything blocked in the port where the tube connects. Often stuff gets clogged in the port itself causing that issue. Check the rubber tube as well to make sure it is clear and free of any cracking or dry rotting. Also check the exhaust port at the outside to make sure nothing is blocked on the vent tube outside your house. If all that is good you need to check the pressure switch itself as that may be bad and not working properly.
Yes you need to check the pressure switch circuit.
Replace the pressure switch first as the blower is working and running just make sure the port is clear where the tube connects to the exhaust blower. Other than that try a pressure switch out and also make sure the condensate drains are clear and draining.
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Yes I would as that is the most common and likely issue of blockage
Pressure switches fail, but more times than not,There is another issue keeping it from closing.Before just starting to replace parts, remove the hose and make sure it is free and does not have a split where it connects to inducer.Go to the trouble to remove the inducer if you have to ands look inside to check that there is nothing blocking the port such as carbon build up , that little blower wheel is in tact and that nothing is inside effecting vacuum.I have found small birds and lizards inside.
That is what I suspected while other expert who jumped in kept telling you the switch was bad and begging for you to pay him.Pressure switches are rarely the problem,Usually something preventing switch from closing.
I see the inducer looks pretty rough.How was the gasket where it mounts to furnace.May be leaking there.
You either have a bad pressure switch or like I posted earlier a blockage of some sort. Now the pressure switches can be damaged by blowing through them as well, you can only very gently suck a small amount of air through them for testing. Secondly if the exhaust fan is coming on and blowing good air out the vent outside I would double check the hose port and even blower itself for any issues. The fan could be bad and not blowing enough air, the housing around the van could be rotted through or a shaft seal could be bad, but other than that there is not too much else that would cause this issue. I am sorry you are dealing with two techs here, just note I am HVAC_GURU and when you choose to rate a tech just make sure you choose which tech you want rated as that is the one that receives payment and credit and there can be only one rated.