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My furnace is leaking water when the heat is running

I have a gas furnace combined a/c unit. Water is leaking out somewhere while the is on. I installed a condensation pump for the a/c, but why is water coming out with the heat running?

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  • Anonymous Mar 26, 2009

    I have same problem. There are also some noise when furnace starts

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You probably have a 90+% efficient furnace. They produce condensation. Does it have PVC vent pipes? If so there is a drain tube for condensation.

Posted on Jan 23, 2009

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Posted on Jan 02, 2017

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1 Answer

Furnace has water under it, why? Its a Dayton gas furnace.


There are several questions that need to be answered about what type of system you have, but i found this posting that may help:
As your gas furnace runs, is there water leaking at the base? Is the furnace's air filter wet, too?There are a few things that could be happening here. But if you have a high-efficiency furnace, here's the most common cause: a condensation leak.
We'll explain why a furnace creates condensation, and what's causing it to leak out of your furnace.
Note: You'll know if you have a high-efficiency furnace if:
  • The yellow energy guide tag says your furnace's efficiency is 90% or higher AFUE.
  • The vent/flue pipe is white PVC as opposed to metal.
Why a high-efficiency furnace creates condensation
How in the heck does a high efficiency furnace create condensation/water anyway?
It's all about how the furnace extracts heat from combustion gases.
A lower-efficiency furnace extracts some heat from combustion gases and then quickly vents them out the flue pipe.
But a high-efficiency furnace, to extract more heat, has 2 heat exchangers. These allow the furnace to extract heat from the gases for a longer period of time. This causes the combustion gases to cool and then condense.
That condensation then exits out your home through a drain. But if that water is pooling around the furnace, there's a problem preventing it from draining properly.
Causes of a condensation leak around a high-efficiency furnace
  • Clogged condensation tubing
  • Clogged condensation drain
  • Breaks in the condensation line
  • Issues with the condensate pump (if you have one)
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.
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. Your humidifier should be getting annual maintenance from a professional to prevent this.

Dec 13, 2016 | Dayton Heating & Cooling

1 Answer

Does the water heater and furnance run on gas and electric?


If the units are in a RV then yes, they both may run on gas and DC (battery power). The furnace requires gas to provide heat and DC power to run the fan. A water heater may be gas or electric, but if gas, it requires gas to heat and DC power to ignite. If the water heater is electric it requires AC power to heat.

Oct 15, 2015 | Water Water Heaters

2 Answers

What size fresh air vent do I need in a boiler room with a gas boiler and gas hot water heater with about 220,000 btu combined


I suggest that you run a duct that is 3 inches larger than the furnace duct . and you should run it down close to the floor and aim it in the direction of the furnace. this will trap warm air above the vent and supply an adequate supply of air for combustion. also make sure you have insulated any pipes in the furnace room that carry water or steam you want heat where you live, not going up the chimney.

Aug 02, 2014 | Water Heaters

1 Answer

I have a Coleman model # FC32A3XN1A. The code is flashing 10 = Gas flow with no call for heat. There is also water in the bottom of the furnace below the circuit board. I also hear what sounds like water...


Turn everything off your coil is frozen over and destroying the furnace. The furnace has water on the flame sensor and it thinks the gas is on but it isnt. The water is grounding out the flame sensor. If there is no water damage to the circuit board all you have to do is dry your flame sensor off and you should be fine. Now for the frozen coil you have a freon leak most likely or an air flow issue but you have to thaw the coil out completely before you can find out the problem. Check your air filter is it clean make sure your blower inside the furnace is rotating. If all these things check out ok you have to get the A/C charged with freon you have a leak. If this help please rate me and do a testimonial.

May 23, 2011 | Heating & Cooling

1 Answer

I have a Trane 90XL installed in 2001which has been running great for 10 years. Now in very cold temperatures this week there is water seeping from the base of the unit. Water is slightly yellow/green in...


Make sure all of the condensate lines are open. The Hose and traps from the furnace. With the cold weather the Furnace is running alot more and Condensing more water from the Flue Gases.
The Furnace can produce up to 5 Gals of water in an 8 hour period. If the drains are all open then you better get a professional to check out the furnace you could have a cracked secondary Heat exchanger which could be leaking carbon monxide into the house. Do you have a CO2 Detector in the house??

Jan 21, 2011 | Heating & Cooling

2 Answers

I have water leaking out the bottom of my furnace when the aprilaire 700 is working. I have tried everything to resolve. It was working fine last month. I changed the water filter, cleaned the lines...


How old it your Aprilaire 700?
Eventually they all need maintenance, cleaning or replacing dirty or inoperative parts. The bottom Water tray has a drain tube that needs to be cleaned or replaced every fall as it will plug up with mineral deposits washed down from the unit. Adding a water filter to the inlet line (if you don't already have one) will reduce mineral scale build up and reduce the need for cleaning and maintenance. Some water filters may bypass uinfiltered water when very dirty. If thats OK, then the solenoid valves could be dirty, worn and now leaking all the time (not shutting off at end of operation cycle) These valves, 2 usually 1 Low volt operated 24 VDC supplied by thermostat and or humidistat when caling for heat, and 1 High volt 120 or 240 VAC suppiied by furnace fan delay switch, All Gas furnaces have a fan delay to allow the heat exchanger to warm up so the furnace does not blow cold air at the at the start of every cycle of heating. Both have to br powered on to allow water flow.
Click on the link below and read the Aprilaire Manual maintenance page. This Manual covers several models, so disregard parts not pertaining to your model number.
Remember to turn of electrical power to unit, furnace, air handler if a split unit, and don't attempt anything your not exceeding your experience level.
Vote for Patrick Mot, Thanks

http://www.aprilaire.com/themes/aa/en/manuals/AA-Humidifier-Owners.pdf

Dec 24, 2010 | Heating & Cooling

2 Answers

My reliance sta-kleen 502 is leaking. The water is dripping on top of the pilot light, extinguishing the flame . Please advise me with step by step instructions to diagnose and attempt fix this myself....


If you have a leaking water heater there is a serious problem.
http://waterheatertimer.org/Water-heater-leaking.html
Page shows how to limp along on a leaking water heater if your water heater needs replacement.

One of three things is causing the water:
1) Loose water connection on top of tank that is dripping down inside tank >> check pipes on top of tank.

2) The vent is clogged or not working correctly causing condensation inside flue pipe.
Condensation water is dripping back down inside tank.
Problem means possible CO poisoning if gas is not venting.
Look at vent pipe to see if joints are corroded.
Use long fireplace match > light match and put into draft hood at top of tank and see if smoke goes up.
Put hand at draft hood opening when water heater turns on to see if vent gas enters home.
Do same test when furnace turns on to see if furnace vent is pushing back into water heater.
Does water heater vent inside same pipe as furnace? You may need to set up separate vent for water heater if furnace gasses are pushing back into home.
Check furnace vent for obstructions.
Look at vent stack top of home to see if hood is in place.
Check if bird nest is built inside warm vent pipe.
Improper flue is top priority for getting fixed so vent gasses properly escape home.
You may have to call a plumber.
Professional plumbing forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

3) Your water heater is rusted out.
A rusted tank has to be replaced.
It cannot be repaired.
However, before replacing tank, you do not want a tank failure where tank ruptures and water runs inside home until water is shut off.
This will cause major damage.
Protect yourself first.
Turn off water valve above tank.
Move gas knob to 'pilot' so burner is not heating water.
Open tub spout on hot side to relieve pressure on tank so it will not rupture.

Now you're protected.
Link above shows how to limp along on failed tank until you can replace heater.

You need a new gas water heater from Lowes or Home Depot
Look at label on side of you tank for gallons and btu's of your water heater.
Measure height to flue pipe so you get same height water heater, so pipes don't have to be changed.
You need a pipe wrench and teflon tape which will be wrapped on each pipe thread when pipes are reassembled.

Step1) Drain water heater using valve at bottom of tank.
http://waterheatertimer.org/Water-heater-will-not-drain.html

2) Turn off gas valve going into heater.
When gas valve is perpendicular to gas line, then gas is off.
Dissemble gas line to water heater.

3) Disconnect flue pipe and support flue pipe with wire so it doesn't not fall down. Flue pipe joints should be held together at each joint with 3 screws.

4) Turn off water. Shut off valve is on COLD side.
Disconnect water pipes.

5) Move old water heater out of way.

6) Set new water heater in place. Put water heater in drip pan.

7) Connect water pipes >> cold goes to side marked cold.
Hot to hot.
Buy new flexible water connector pipes at home center for easy installation of water pipes.

8) Connect gas line exactly as it was connected before.
Home center sells flexible gas line connector for easy installation of gas line.
To test for gas leak after installation, mix liquid soap with water and put around gas line joints to see if there are bubbles.
Natural gas has less pressure than water lines, so gas pipes are easy to seal with ordinary wrench.

9) install TP pipe that runs to floor. Use old one off old heater.

10) Fill tank completely with water until water is coming out of tub spout.

11) Turn on gas, and light pilot as shown in manual.
New gas heater sometimes have small water leak when first fired up, so ignore a bit of water.

12) Save water heater manual like it is gold, and read everything in manual.

Dec 18, 2010 | Water Heaters

7 Answers

Goodman furnace updraft with A/C on top. Drain tray on A/C (plastic) cracked causing water to leak to floor. On inspection, furnace heat tubes on back show hot spot immediately under the crack in A/C...


Hi,
You would need to look at the warrenty of the product from the manufacturer of this whole unit. If they were purchased as individual parts then each manufacturer is responsible for their compinents.

However, you must have a warrenty on the product to be able to bear any responsibilty to the manufacturer.

If you do have a warrenty then they should up hold it, and they should also have a solution to the fault. It will be pointless to replace the tray only to have it reoccur again. It seems as though they have missed out putting a insulation of some sort between the heat source which evaporates the water in the tray.

Hope this helps, let me know how you get on.

Thanks

Jason

Jun 04, 2010 | Goodman GMS90703BXA Heater

1 Answer

Honeywell HE260 leaks somewhere


Neither, even if the solenoid or humidistat stick, it should always drain properly. Is the unit mounted on the cold air return duct or the supply plenum? If it's mounted on the supply plenum, the water panel might be getting blown forward and spilling the water. High efficient furnaces also can leak water on the floor if its drain is restricted. If hum. is mounted on return duct make sure drain is clear by blowing through it. On Honeywell hum's I've seen the rubber hose from the solenoid valve to the distributor tray leak too, check the rubber 1/4" hose.

Dec 28, 2009 | Honeywell HE260A1010 Whole House...

5 Answers

Water leaking out the bottom of my Furnace


One of the drain tubes (overflow) is plugged. Unhook each one and clear them of any debris.

Dec 20, 2009 | Goodman GMS90703BXA Heater

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