Strolling downstairs and viewing a puddle is never fun, especially when you're left wondering why is my furnace leaking right in the middle of a cold breeze. It's one associated with those stuff that seems like an instant emergency, mostly since water and electricity (not to point out expensive HVAC components) really don't enjoy well together. You'd think a machine designed to produce heat would be the last thing to cause an avalanche, but it's really a pretty common issue that homeowners face.
The particular good news is that a leaking furnace doesn't constantly mean you need a total system replacement. Sometimes it's a five-minute fix, while other periods it might require a bit more detective work. Before a person panic and call every plumber within the phone guide, let's walk via what's likely going on inside that will metal box and exactly how you can shape out in which the drinking water is coming from.
Is It a High-Efficiency Furnace?
The first point you need to determine is what kind of furnace you actually have. This makes a big difference within identifying the leak. If you discover white plastic PVC pipes coming out there of the medial side or top of the unit, you have the high-efficiency condensing furnace (usually rated 90% AFUE or higher). When you have a metal exhaust pipe, you have a standard-efficiency unit.
Why does this issue? Well, high-efficiency furnaces are designed in order to create water. These people have two temperature exchangers that draw so much high temperature out from the fuel that the exhaust gas actually cool down and turn into liquefied condensate. This water is supposed in order to be overly enthusiastic through a drain range. If that program fails, you obtain a puddle. Standard furnaces, however, shouldn't be producing drinking water at all with the combustion process, when a standard unit is leaking, the culprit is generally something attached to it rather than the furnace itself.
Clogged Condensate Empty Lines
In the event that you've got one particular of those high-efficiency units, the almost all common answer to "why is my furnace leaking" is a simple clog. Because systems produce a lots of water—sometimes several gallons a day—they rely on a network of plastic tubes and a floor drain or a pump to obtain rid of this.
Over time, dust, dirt, and even weird slimy algae can develop up inside individuals lines. Once the line is blocked, water backs up, fills the interior drain pan, and eventually splatters out onto your floor. You can often check this your self searching at the particular clear plastic tubing. If it appears dark, gunky, or filled with position water, you've discovered your problem. Usually, the quick flush with some compressed air flow or a shop vac can clear the blockage plus get things moving again.
Problems with the Condensate Pump
Its not all basement has a floor drain right alongside the furnace. If yours doesn't, you probably have the condensate pump—a little plastic reservoir along with a pump inside that pushes the water up and from your house. These issues aren't built to last forever.
Sometimes the drift inside the push gets stuck, or maybe the motor simply melts away out. When the pump fails, the reservoir overflows, plus you end up getting the mess. You can test this by pouring some water directly into the pump's reservoir. If the particular pump doesn't give up on and begin moving water out there, it's likely lifeless. Luckily, they are relatively cheap and simple in order to swap out in the event that you're a little bit handy.
The Built-In Humidifier Is Leaking
If your furnace isn't a high-efficiency model but a person still see drinking water, it's time to appear at the humidifier. Many HVAC systems have a whole-home humidifier mounted on the particular side of the particular ductwork. These products use a constant stream of water to add moisture in order to your air throughout the dry winter a few months.
These humidifiers have a water panel (or filter) that will needs to become changed at minimum once a season. If it gets blocked with calcium and mineral deposits, the water can't soak by means of it properly plus starts splashing around inside the casing, eventually leaking over the side of the particular furnace. Also, check out the solenoid control device and the small copper or plastic material water line giving the humidifier. A little pinhole leak or a loose connection right here can create a surprisingly large mess over a several hours.
An issue with the Supplementary Heat Exchanger
This is the "worst-case scenario" reply to why is my furnace leaking. In a high-efficiency furnace, the supplementary heat exchanger is where the weighty lifting happens. If this component is cracked or faltering, it's a big deal. Not really only will this leak water, yet it can also be the safety hazard.
Replacing a heat exchanger is an expensive, labor-intensive job. If your furnace is obtaining up there within age—say, 15 in order to 20 years old—a cracked heat exchanger is often the particular sign that it's time to start buying for a fresh unit. If a person suspect this is the case, you definitely want a professional to come out and operate a burning analysis to make sure the unit is nevertheless operating safely.
The Air Conditioning Drain Pan
You may be thinking, "But it's the center of January, why would my AC be the issue? " Even if you aren't running the cooling, your AC's evaporator coil (the "A-coil") sits right on best of or inside your furnace.
If the strain pan under that coil is corroded through or in the event that the drain series shared by the particular AC and the furnace is backed up, you'll see water. Sometimes, throughout the summer, an icy coil will thaw out and get rid of a bunch associated with water, but in the winter, it's much more likely that the furnace's condensate is support up into the AC's drain system. It's all connected, therefore don't eliminate the particular "cooling" side of the machine just because it's snowing outside.
Improperly Sized Vent Pipes
Standard-efficiency furnaces use metal vent piping to carry sizzling exhaust gases out there through the chimney or roof. If these pipes aren't sized correctly or when they aren't slanted properly, the hot atmosphere can cool down as well quickly before it exits the house. When that occurs, the moisture within the exhaust condenses inside the pipe and runs back down toward the furnace.
If you see water dripping from the joints of a metal exhaust pipe, this is likely what's happening. It's actually a bit dangerous because that water is acidic and can eat with the metal over period, potentially allowing carbon monoxide to drip into the home. This particular isn't a DIY fix; you'll require an HVAC tech to realign or resize the venting to make sure everything stays hot enough to stay in fuel form until it's outside.
What Should You Perform Right this moment?
When you see water, the first action is to turn the system off. Find the change on the side of the furnace or even flip the breaker. Water and internal circuit boards really are a recipe for a very expensive short circuit.
Once it's off, soak up the water which includes old towels or perhaps a shop vac. Making water sitting on the floor or inside the furnace cabinet can lead to corrosion and mold, which you definitely don't want. After you've washed up the mess, try to trace the source. Is this coming from the pipe? Is it dripping from the seam in the steel? Is it overflowing from a plastic material pump?
Keeping It Dry in the Future
The greatest way to stop asking "why is my furnace leaking" is to stay on your annual upkeep. Many of these issues—clogged drains, crusty humidifier parts, and failing pumps—are things a specialist would catch throughout a routine tune-up.
It's easy to forget about the furnace when it's working fine, but a little bit of preventive care goes a long way. Swap out your filters regularly, keep close track of those plastic drain outlines, and maybe pour a little bit of vinegar and warm water through the condensate collection once a yr to help keep the algae away. It's a lot cheaper than dealing with a flooded basement on a Sunday night.