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Does the small vent come on when you call for heat?
THere is a small vent motor called an induced draft motor. The pressure switch is normally open.On call for heat that inducer motor has to come on to draw vacuum on the switch to close it. I am asking if that little fan is coming on?
OK that is why pressure switch is not closing.Do you have a volt meter so we can troubleshoot to see if that small motor is getting power?
No it is not getting power or no you do not have a meter?
OK until it gets power switch will not close.What is model on furnace?
Lets try bypassing thermostat.To do this, JUmp the R and W wires at the furnace.http://i.imgur.com/JprQdYv.png
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