If you mean the heat or AC cycle, it has to do this to cool down the furnace/coils. It is a safety cycle and do not try to defeat this purpose.
It will blow forever until I shut off the furnace, push a reset button on the vent safety switch, and then turn the furnace back on. It does't do this all the time, just here and there.
I see now. Thanks for the added info. Sounds like contacts can be an issue here and I do not recommend trying to fix this yourself. I think maybe a good reputable repairman should do it. I could if I was there but you have listed quite a few issues. I'm sorry I could not help you here.
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Furnace or Heating System Troubleshooting
heatman101
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