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OK after several weeks of proper function the same old thing started again. Cycling on and off with no ignition. Three quick flashes indicating the pressure switch as the culpret. Well since it is...

I bought a new switch for $25.00. Took all of about 5 minutes to install. Furnace has worked since except for one time when it acted like it did prior.

So this AM I get up and the thermostat is set on 64 and the temp is 64 so I bump it up to 65 and the furnace starts and runs just perfectly. Then 10 minutes later the vent fan starts but the furnace...

My Trane must have a similar problem except the problem comes and goes. For instance the other morning it was turning on via the thermostat, the blower fan starts, burners ignite and then after 45...