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Did you or tech drain all water from inducer vent motor if it had water inside?
OK. now at this point if you remove hose from inducer to pressure switch is there any water in it?
OK next check the drain hoses and make sure no water is backing up in drain.That will cause same vacuum issue.
Take your time. Make sure man drain line is free and clear and no water backed up in any hoses.
OK did you use excact replacement switch as what was there from factory?
Ok now we know we either have an issue with vacuum or switch since it works with cover off.The usual causes are:
Water or debris blocking hose
Defective pressure switch
Defective inducer not pulling sufficient vacuum
Defective gasket causing vacuum loss
Defective secondary heat exchanger
Next step in verifying is going to be to get a vacuum pressure gauge and that reads water column and see if the issue is with switch or vacuum. Possible you got a bad switch improperly calibrated.
Gasket will be where inducer mounts to unit.Did you cycle power off and back on after repairing hose to reset board?
Watch and see if it stays running .
So will switch close and stay running now?
If you have further questions, please let me know.
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Sounds like you are still losing vacuum then.I would either get someone to check the actual vacuum with a gauge or try a different pressure switch.