Why is water pooling inside my furnace?
Water leaks in a furnace usually stem from internal issues like condensation drainage problems or components hidden behind the side or plastic panels. This unexpected pooling stops people from safely running their heating system without constant worry or hearing sloshing sounds from the fan.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Checking and clearing the condensate drain and pump
- 2Replacing the collector box and gasket
- 3Applying red RTV silicone sealant to fix leaking gaskets
- 4Cracking the casing to drain the accumulated water
- 5Checking intake and outtake pipes for blockages
- 6Looking for clogged condensate lines or traps
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Wife noticed some water on the floor by the corner of our furnace this morning.”source ↗
“It def seems to me it’s coming from behind the black plastic. And it’s basically centered from the distance to either edge.”source ↗
“So first year turning the furnace on at this place and it has been giving me a hassel all week.”source ↗
“I just was checking the furnace room and heard a bit of sloshing under the noise of the fan running. So I turned off the furnace, popped the side panel to find some water pooling inside and the fan feeling warm to the touch.”source ↗
Where this came up
People with this problem also raised
- 2Can you service an HVAC system with leak seal in it?
- 3Why is water dripping from my furnace when AC is on?
- 2Why does my furnace make a loud banging noise?
- 2Furnace making a humming noise even when it is not running
- 6Do I need to replace a leaking gas stove fuel line?
- 3Should I replace my HVAC system if the evaporator coil leaks?