A little common sense sure helps

My home has a modern high efficiency furnace only a few years old and of course troubles so being the diy i am I made a go at it after studying the things sensors for flame on vacuum on excessive heat induction motor the condensation hoses from the heat exchanger to various routes and then sensor for vacuum so after a fast course in HVAC online utube I realized it was my pressure switch a vacuum sensor / exhast fan sensor basically a rubber band with a cord (like a cord plug into a electrical outlet)was bad as it stuck open and closed so I ordered one saving big bucks then of course same thing as I watched it start up I realed a vacuum line connected to it from the heatexchanger to it was the problem after I double checked my install the gas line ignition set a backpresure throwing off the vacuum pressure thus sending a signal to the control panel the fan was off due to no vacuum detected but in fact the fan was running but soit kept trying to restart and programmed to do so four times before the system shuts down so after a minor adjustment for that backpresure it's game on and another skill mastered .

A little common sense sure helps

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