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Inducer should run non stop anytime thermostat calls for heat.
Not sure what you are looking at.The inducer is never to shut down once thermostat calls for heat until thermostat is satisfied. Its purpose is to assist in removing the exhaust from furnace and keep pressure switch closed. If inducer stops, the pressure switch will automatically open shutting down the burners.
One quick thing to do is make sure outdoor unit is not running (AC and heat at same time)
Let me know.I have seen this happen and heat is fighting ac
Ok next Is there any broken or damaged ductwork that would allow outdoor air in or for our heated air to escape?
Can you take a temp at return and the right at top of furnace to see what our rise is?
OK this sounds like you may have a gas pressure issue.We should have at least 25 degree rise and the exhaust should be at least 130. Do you have a manometer or gas pressure gauge to check pressure in and out of valve?
It may burn but not hot enough if say valve is allowing say 5"" WC pressure through. Are you able t load a video of burners when on? The flame should be shooting well into the heat exchanger.See beginning of this video.
With LP gas we should have around 14"WC going into valve and about 10.5 coming out. lets check that and go from her.