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Questions tagged [furnace]

The furnace is part of an HVAC or central heating system used to generate heat. Typically this is done with gas, a heat pump, or an electric element. For hot water and radiator based heating, use the boiler tag.

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2answers
730 views

Do the doors on my utility closet need to be vented steel?

Our home is on a slab foundation, our furnace and hot water tank are in a closet. Currently we have vented steel bi-folding doors, I'm looking to replace the doors. Do they need to be steel and vented?...
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27 views

How to Run Fan Only with Thermostar Furnace With G Wire

I have a Thermostar Furnace that works great for Heating our home. We do not have AC and do not want that. But, we do want to be able to just run the fan without heat. The W and RH wires were ...
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1answer
51 views

Placement of evaporator unit on top of furnace (residential)

I am installing an updraft 3 ton system with the evaporator on top of the furnace. They fit nicely, but I'm not sure which front-or-back orientation the top unit should be in. In the attached ...
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1answer
183 views

How should the thermostat wires be connected to my furnace?

I have an Amana AMV90704CXBB furnace, and regular programmable thermostat. I took the furnace apart because I have to wash the blower motor wheel. It was covered in construction dust. In order to ...
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0answers
352 views

Where should I connect my C wire on Goodman GMP075-3 Rev.B

I am trying to install an ecobee4 to replace a digital battery powered thermostat. I removed the existing thermostat and found that there was a spare blue wire that was wrapped around the others that ...
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2answers
350 views

Is the ventilation in my utility closet a construction mistake?

With colder weather here in Northern Colorado (down to 22° F) my Goodman 90% efficiency furnace (GKS90453BX) came on for the first time in the (ca. 2005) home that I recently moved into. The furnace ...
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16 views

Do I need to replace the thermostat wiring leading to my boiler?

I have a boiler in an old building with four different apartments. There are two thermostats that call for heat from the boiler, and valves that direct the hot water to the respective part of the ...
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1answer
1k views

Pilot Light keeps going out when thermostat is kicking on furnace

So I have had furnace man come out 4 times, plus the Gas company. Here is what has been done: - New thermocoupler - Two new gas valves - New Orface and line blown out - Gas company changed gas valve ...
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1answer
40 views

rewiring a furnace for an inside fan

I have a Outdoor AC unit that has an A-coil in it, so it pushes all of the air from outside through huge duct work and into the ventilation, which by the time it gets to the last room its extremely ...
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0answers
302 views

Lennox furnace 3 flashing lights

Have a new construction house, and lived here about 2.5 yrs. Turned on my furnace last night worked fine. This morning, it kept turning on then kicking off with no burners coming on. I noticed the ...
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114 views

Furnace draft inducer switch tripping

I have an older furnace and a brand new natural gas instant water heater that I installed. I only start this way because the furnace had one thing break last year, so I'm not sure if things on it are ...
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2answers
4k views

Where do I connect a C wire in an old Furnace?

I am hoping to be able to upgrade to a smart thermostat but unfortunately my furnace doesn't have the "easy" option with an obvious C terminal. My furnace is OLD but it actually has the full 5 ...
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1answer
204 views

Connect Wifi Thermostat to Goodman GMP050-3?

I'm trying to connect up a wifi thermostat to Goodman furnace, specifically the GMP050-3. I've done some reading on this but I'm still not quite sure how to go about it. Specifically, I'm not sure ...
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1answer
568 views

Hot water heater T&P discharge going into furnace condensate pump?

I recently had some electrical work done at my house, and as part of that, the power was shut off. After a few minutes, we noticed water coming from the closet containing the hot water heater and ...
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76 views

Proper way to seal attic space from the living space

I am living in a one-story house with flat roof. There is an 2-feet-high empty space above the ceiling and below the roof, and let me call it my attic space (although my house has a flat roof). The ...
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2answers
62 views

Are air vents in a house intended to let some air through when they're closed? Would it be bad to completely seal it?

I would like to be able to use the vents in my house in a way that targets specific rooms/areas more than others. Sometimes I want to completely close off a room from being temperature-regulated by ...
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3answers
2k views

How to Sync Booster Fan with Furnace Fan

I own an old house. Some of the rooms in the house that are too far away from the furnace are not getting enough air, the airflow is too weak. I tried to close as many of the other ones as possible, ...
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2answers
125 views

Can I use this piece (see pic) as a replacement?

Hi Guys, I am on my last connection in my new mother board replacement for my Carrier furnace. As I was trying to connect the wire in the top picture to the terminal it wouldn’t fit and the ...
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0answers
59 views

Replacing a motherboard on a Carrier 8000VS Furnace

Hi guys, I am trying to finalize the wiring of my new carrier motherboard. I have about four more wires to connect and the new motherboard is slightly different than the old one. The pictures I’ve ...
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1answer
55 views

Fan comes on but the air conditioner does not

During hot days when the air conditioner is on a lot it comes to a point in the evening when the air conditioner shuts down and the fan (from furnace) stays on. This will go on all night as the house ...
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0answers
48 views

Converted Oil Furnace to Natural Gas - Fuel Smell Issue

This weekend, we had our fuel oil furnace replaced with a natural gas one. The oil furnace broke near the end of the winter and we were waiting for a deal to kick in on a whole new furnace + A/C unit. ...
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1answer
1k views

Where to connect c wire in furnace?

I'm trying to figure out where to connect a C wire from a thermostat to my furnace. I found this old post for the same furnace type (Trane XE70), but it seems as though a red wire goes to the terminal ...
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1answer
40 views

Can’t seem to find the C wire on the furnace in my new home

My wife and I just purchased a Mobile home and there is no C wire on the furnace to hook up the common wire. We came from a rented home where we already had a Nest and wanted to hook it up in our new ...
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1answer
342 views

Adding Unused C-Wire for Nest Thermostat

I'm having an issue with my NEST thermostat short cycling my air handler fan while in running AC. This is a known issue, and the fix seems to be adding a common wire to the NEST. My thermostat is ...
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0answers
95 views

Correct wiring for Nest thermostat with dual HVAC system

Trying to wire up this new-fangled Nest Thermostat E (the cheapy edition) to my home HVAC system, but unsure of what to do. At the thermostat, I have G, W, Y, R, AND Rc wires, but the R and Rc wires ...
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1answer
117 views

furnace exhaust - move for renovation

We are in the US. We have a 95% efficient furnace that exhausts to the house in a straight line from the furnace to the wall. We are building an extension to the house and the exhaust will now be a ...
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0answers
1k views

Furnace Mainboard wiring with AC unit

I went to install a Nest on my upstairs HVAC unit. After installing the Nest I thought it was functioning properly. The next afternoon I came back to the house It was still hot, so looking into this ...
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3answers
2k views

How can I resolve a “vent intake or termination” problem on my furnace?

It's June so my furnace has been off for a while. But it's cold today and I have a sick kid home so I tried to start my furnace but it's not working. I'm getting an LED code with three red flashes ...
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1answer
190 views

My blower motor doesn't have the brown wires for a capacitor

My blower motor only has 3 wires and there's no wires for a capacitor
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1answer
44 views

Where should I attach the blower motor leads on a Payne air handler?

About 8 months ago my daughter's Payne PF1MNB036000AAAAA air handler quit working. The blower would not come on. I decided that it needed a new board so since she needed heat I disconnected the ...
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1answer
1k views

Low voltage wiring of outside condenser & condensate pump

This is my 1st question here, hope someone can help quick since temperatures are rising. This past winter the cage on my furnace was making noise. It was the fan hitting the cage. I took it out and ...
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1answer
560 views

Running furnace fan as cooling

I have a regular furnace without a HVAC setup. When it's summer we usually have the fan running constantly. The furnace fan then runs at about half the speed as it would when the heat is one. ...
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1answer
213 views

Furnace struggles to ignite after new inducer motor

I recently replaced the inducer motor and wheel on my 15 yr old Payne furnace due to very loud and annoying operation. The new motor made a huge difference... runs much smoother and quieter. But the ...
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1answer
72 views

What kind of air conditioner system do I have?

I know this site says 'DIY', but if this question belongs somewhere else, let me know which site is appropriate for this question. Thank you. At the beginning of this month, I had a Coleman air ...
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0answers
22 views

Why won't my furnace turn on?

My furnace will not turn on. Unless: Switch off. Unplug Fresh Air Intake Motor (a MagneTek ). Turn on (hear a click). Plug motor back in. Heat fires. Blower distributes Its a ...
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3answers
8k views

Inducer Motor spins up then shuts down

Upon starting the heat cycle the inducer motor spins up then shuts down it does this sometimes 3 or 4 times before the burners lite. Sometimes even after the burners lite it seems to shut down ...
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0answers
49 views

Lennox G20 furnace

I was reading about using the T terminal for the C wire for internet thermostat. I have different wiring Thermostat Furnace RC R W. W Y Blank Rh T G. G ...
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1answer
58 views

HE gas furnace replaced bad inducer but no ignition

I have an approx 20-year old Tempstar (model # NUGK125DK08, manufactured by 'Inter-City Products') 90% eff gas-fired furnace. Yesterday morning we noticed it was blowing only cold air. I opened it up ...
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4answers
589 views

Inducer Fan Blowing Out Flames and Pilot Light on Carrier Furnace?

I have a Carrier furnace and have recently replaced the inducer fan assembly in it. The old motor assembly had a piece of sheet metal dangling under it; whereas, the new one does not. The unit ...
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2answers
5k views

No C (Common) terminal on Furnace.

I am trying to hook up a new wi-fi thermostat. I currently have 4 wires running, but there are many unsued that are terminated in the jacket of the wire. No issues there. However, when I ...
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1answer
64 views

Furnace and Thermostat Issue

One day my parent's furnace and thermostat stopped working. The thermostat is a smart thermostat that depends on 24volts to the R and C wire. We measured voltage between the R and C wire and was ...
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2answers
46 views

2 thermostats week on week off

I work week on and week of so my house requires completely different heating on these weeks. What I want to do is have 2 thermostats set to the different setting and turn one on and one off depending ...
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1answer
51 views

what is a reasonable amount of condensate water produced by my pump?

I have a Ruud hi-efficiency furnace and also a Ruud tankless hot water system, both with condensate lines running down to the pump. My problem is... the pump runs (intermittently) ALL day long..lol.. ...
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2answers
101 views

how to insulate attic that contains high-efficiency furnace?

We have an older home with a separate high efficiency furnace for the second floor. It sits on a floored area of the attic. We have virtually no insulation and I've gotten various recommendations ...
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1answer
314 views

What are these 3 pipes on the side of my furnace / AC?

I'm trying to install a whole-home humidifier. I'm wondering whether I can use these copper pipes as supply lines for the humidifier. Any guesses as to what pipes A, B, and (just out of curiosity) C ...
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2answers
2k views

Old Carrier Furnace, 3-Wire Pilot Assembly, Electrode Sparks Continually While it Runs

Our 29 year-old Carrier furnace relies on a 3-wire pilot with an intermittent spark igniter. It sparks probably around 30 times before the gas valve opens and the furnace fires up. That's a lot of ...
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0answers
800 views

Low speed furnace fan blower motor will not shut off

I have a carrier furnace that has a low speed fan blower motor that will not shut off no matter how long I leave it running. I checked that removal of the G wire at the control board does not change ...
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0answers
53 views

Gas pilot will not light

I have a very old forced air heater in my house. When I try to light the pilot it will not light. It has gas coming out of it because the pressure of the gas even tries to blow the match out when I ...
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1answer
1k views

Goodman furnace ignites but fan won't run

My Goodman furnace burners ignite fine but fan never starts. Have I got a bad fan motor? LED blinks 4 times for High Limit Switch. I've removed the switch and shaking it softly you can hear the ...
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1answer
1k views

Electric furnace wiring

I am wiring a 240v furnace with 6/3 wire. The furnace has individual breakers as the connection point, one for each phase. My question is- is it ok to jumper the neutral from one breaker to the other. ...