Water leak from furnace (AC, ceiling, stains, plumbing)

[Parsec]

I was away Memorial Day weekend and when I got home I noticed a puddle of water around my oil furnace in my basement. I mopped it up and 2 hours later the puddle was back. The furnace has been OFF for weeks. Any ideas what could cause a water leak? The water seems to be seeping out from under the cinderblocks that are holding the furnace off the ground.

[K'ledgeBldr]

It's probably condensation; or possibly ground water.

[QIS]

Hi Parsec,
Check under the furnace for possible causes for sure,but, check any and all areas around and above the furnace ( the walls,floor, ceiling) and penetrations like ducts, fuel lines, plumbing lines, ac condensate line, the vent pipe, electric conduits or cords and check for any stains/signs of dampness. Water could be directed to the HVAC equipment and eventually puddle under it.