Without more info we are guessing, but one possibility is the furnace is in safe mode. When the thermostat calls for heat, the blower turns on for a short time them the controller opens the propane solenoid and tries to light the burner. If the burner does not light it huts off and tries again after a short time. After several tries, it goes into safe mode. Make sure you have purged the lines of air by running a stove top burner for a minute or two. Pull the 12V fuse for the furnace and wait a few seconds. Reinsert the fuse and try again.
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