Why Furnace Leaking Water When Heat Is On – Comprehensive Guide

Furnace Leaking Water When Heat Is On

As winter approaches, your furnace gets more crucial than ever since you rely on it to maintain your household warm and comfortable during the period. However, witnessing water coming from surrounding the unit could be concerning. You may get concerned if your Furnace Leaking Water When Heat Is On.

However, the best course of action is to determine whether or not the leakage is originating from your furnace and address it as soon asap. Since furnace humidity is corrosive, keeping a faulty furnace untreated could cause more harm to both your property and the furnace.

However, you must tackle the exact source of the leakage. This article will explain the most prevalent causes of a leaking furnace and advise dealing with them.

Quick Summary: A blocked condensation drainage, a malfunctioning condensation pump, a fractured exchanger, or a leaky AC could lead a furnace to spill liquid when the heat gets turned on. Maintaining and repairing the condensation drainage system, upgrading the heat exchangers, and repairing your AC leakage are all solutions.

Read more about furnace leaks and how to prevent them.

The combustion gas gets sent to the auxiliary heating element after exiting the primary exchanger. The additional heat converter is where all the effluent or waste gas is heated. It results in the formation of water vapor.

More heat is delivered into the auxiliary exchanger as water converts from a vapor to a liquid. As a consequence, the furnace operates more effectively. The condensation gets then discharged into a condenser pump or flooring drainage. Let’s look at why the Furnace Leaking Water When Heat Is On

Furnace Leaking Water When Heat Is On – All You Need To Know

Condensate Drain

Condensate is liquid that originates from the exit fumes of your furnace’s burning cycle. This water drains via condensate evacuation channels, consisting of a condenser pan where the humidity gets placed and an escape route comprising a pouring outlet and an evacuation piping.

The most typical source of furnace spills is a problem with the condenser discharge channel. Water is a common consequence of natural gas or LPG combustion, particularly if you’ve got a high-efficiency condensation furnace.

PVC drain vents get used in condensation furnaces. Suppose this outlet is accidentally unplugged or has a break. In that case, water will flow from the exhaust and probably wind up in a place on your property.

If the drain grate becomes blocked, the condensation will run back to the pan and overflow, producing a spill and harming the overall function of your furnace. Suppose the condensation pan is rusted or has fractures and fractures. In that case, this might also create a leak in the condensation outlet pipe. It gets shared with old condensation buckets that have served their purpose.

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How To Fix Condensate Drain Of A Furnace?

If your furnace’s condensation discharge line is unplugged or fractured and you lack the necessary abilities to repair it, contact a plumber or Ventilation specialist. If the condensation pipe becomes blocked, clean and unblock it as follows:

  • Turn off your heating and any other connected equipment at the power switch.
  • Locate the condensation pan. It is often found in the utility room or beneath the air handling unit. If there is lingering or spilling liquid in the pan, the exhaust is most likely clogged.
  • Use a broom to remove the water.
  • Use liquid soap to wipe the pan and condensation the pan hose.
  • When you’re doing it, locate the exterior exit of the condensation drain using a Snake Cleaner to remove any obstructions. The snake cleanser would help wipe the condensation drainage. Still, it would also help clear all discharge lines throughout your property.
  • To remove any leftover filth, wipe the drainage with heated water, a little acetic acid, and a sprinkle of liquid detergent.

Cracked Heat Exchanger

An exchanger is a component that moves latent heat. The exchanger exchanges heat from the burning area to the ducting. It also keeps harmful burning fumes aside from the warm air provided to your house.

Suppose your exchanger is spilling liquid. It most likely breaks, enabling fluid that must get evacuated through the condensation outlet to seek another way out from the furnace.

How To Fix Cracked Heat Exchanger Of A Furnace?

Assume you were expecting to find a do-it-yourself fix for a fractured furnace exchanger resulting in Furnace Leaking Water When Heat Is On. An HVAC specialist is the only one who is permitted to cope with a malfunctioning heat exchanger.

An exchanger must get disassembled to get evaluated, which cannot be a trial-and-error solution. Additionally, many HVAC experts would recommend you repair your furnace’s heating element because fractures on this device get connected to the condition of your furnace.

Condensate Pump

Condensate gets frequently drained through a conduit in high-efficiency condensation furnaces. But, if your furnace gets located in the cellar, the drainage lines are beneath ground level and must be emptied.

A condensation pump must pump the liquid pouring into the sump tank via a drainage connection and the external drainage pipe. If your condensation pump becomes clogged or broken, the pumping tank and any attached drain lines will overrun.

AC Leak

Suppose you reside in a location with drastic temperature fluctuations during daytime and nighttime. In that case, you may find yourself using both the air conditioner and the furnace on a consecutive day.

Since air conditioning units take a lot of humidity from your house and convert it to liquid in the cooling operation, they must discharge it via the condensation pan. If the pan spills or the drainage becomes blocked, water might travel through the heating element and appear to be the source of the leak.

Furnace Leaking Water When Heat Is On – Bottom Line

A leaky furnace can cause significant ruin to your home’s floor and cause anxiety. If you see a pool of water beneath your furnace, power off the furnace’s power control to the furnace. If you can’t diagnose your furnace’s problems or don’t understand how to proceed, hiring an experienced HVAC is usually the best solution.


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