We put a bucket near the furnace and towels down. Help

Something stopped up,or condensation line has come loose,, if possible a inspection while furnace is running might tell you the problem,
I say this guessing you have a gas furnace that makes condensation waterif not gas,you have other problems
Also I`m having to guess the problem is when in heat mode and not ac causing the problem,,
Good luck and let us know, what you find