A standard efficiency furnace extracts some heat from the combustion gases and quickly vents them out the exhaust or flue pipe.
Gas furnace flue pipe leaking water from storm.
Some causes of exhaust pipe restrictions are the flue cap is missing.
It was very windy out during the storm.
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.
If this is the case it s best to call your local furnace repair team.
In a gas heated home a flue pipe vents the gases out through the roof.
There s a chance this has.
Improper flue exhaust can result in your furnace leaking water.
Much of the drain system and some of the parts are made of plastic.
If you have a condensation leak with a standard efficiency then its exhaust or flue pipe may be incorrectly sized.
You ll need a furnace technician to diagnose which of these is the issue and then fix it.
In some circumstances the plastic can be cracked.
This can cause premature flue failure.
There should be no water involved with a standard efficiency furnace.
While this may look like water leaking from your furnace it s actually furnace gases that have turned into their liquid form.
Other causes of leaking water around a furnace if you have a conventional standard efficiency furnace then its flue pipe may be incorrectly sized.
If the pan is cracked it needs to be repaired.
The water drips on a piece of wood in the attic which apparently has always dried before causing an issue.
Exhaust pipe restrictions will cause the pressure in the flue to rise creating positive pressure and inhibiting proper exhaust.
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.
This includes the drain pan and the drain piping.
Gas furnace flue pipe leaking water from storm where my gas furnace flue pipe type b runs through my attic i had water dripping from the connections seams in the area where it makes a 45 degree bend water was inside the pipe from blown rain.
B vent leaking from seam in pipe.
Improperly installed vent connector that reduces exhaust velocity.
Broken condensation line condensate pump.
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.
A number of points may fail in the flue but they are mostly easy to detect and fix.
There are other reasons why your condensing gas furnace can leak water.
If this is the case it could be an incorrectly sized flue pipe which is making water to drain back into the furnace.
