Gas Furnace Flue Pipe Leaking Water From Storm

Like all installations that poke through the roof sometimes a flue pipe develops leaks that result in water leakage into the attic or roof space when it rains.

Gas furnace flue pipe leaking water from storm. You ll need a furnace technician to diagnose which of these is the issue and then fix it. Other causes of leaking water around a furnace if you have a conventional standard efficiency furnace then its flue pipe may be incorrectly sized. While this may look like water leaking from your furnace it s actually furnace gases that have turned into their liquid form. Exhaust pipe restrictions will cause the pressure in the flue to rise creating positive pressure and inhibiting proper exhaust.

Some causes of exhaust pipe restrictions are the flue cap is missing. If this is the case it could be an incorrectly sized flue pipe which is making water to drain back into the furnace. Broken condensation line condensate pump. The water drips on a piece of wood in the attic which apparently has always dried before causing an issue.

It sounds like the flue gas is condensing before it has left the flue. B vent leaking from seam in pipe. It was very windy out during the storm. If this is the case it s best to call your local furnace repair team.

This includes the drain pan and the drain piping. Much of the drain system and some of the parts are made of plastic. A standard efficiency furnace extracts some heat from the combustion gases and quickly vents them out the exhaust or flue pipe. This can cause premature flue failure.

There should be no water involved with a standard efficiency furnace. If you have a standard efficiency furnace usually 15 plus years old it should not be leaking water. A number of points may fail in the flue but they are mostly easy to detect and fix. This will cause your gas furnace to leak water.

If you have a whole house humidifier connected to the furnace there may be an issue which is causing the humidifier to leak into your furnace. In some circumstances the plastic can be cracked. Improper flue exhaust can result in your furnace leaking water. There are other reasons why your condensing gas furnace can leak water.

There s a chance this has. If your flue pipe is improperly sized or was installed incorrectly the gases move too slowly allowing them to cool down condense inside the flue and drip back toward the furnace. Your humidifier should be getting annual maintenance from a professional to prevent this. If the pan is cracked it needs to be repaired.

If you have a condensation leak with a standard efficiency then its exhaust or flue pipe may be incorrectly sized.