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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8k views

Is it bad to close furnace dampers in order to balance temperatures seasonally?

I have a two story home. As such, it's always hotter on the second floor than the first floor. As advised by many articles and how-to videos out there, I usually close the dampers in the ducts ...
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1answer
179 views

Whole house humidifier when furnace is in unconditioned space

I have 2 furnaces, one in the garage and one in the attic. These are both spaces with unconditioned air, so they get very cold in the winter. The contractor who helped me configure my garage furnace ...
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2answers
70 views

Electric furnace doesn't perform a cool down stage

When my electric furnace shuts down the fan also shuts down at the exact same time. I was told that it should run for a bit afterward to cool off the coils. Doing some research it looks like this is ...
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188 views

Furnace getting power, but heat/AC not kicking on. LED on board is not lighting up. Thinking the transformer is gone

So far I've been successful in maintaining and repairing my own HVAC system in my house. First week we bought the house (we knew going into the purchase) I replaced the main board. It's been golden ...
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1answer
219 views

Furnace won’t stay running and when the blower motor runs it sounds like it is sucking up water

Part red arrow is pointing to keeps filling up with water and when the motor/fan (blue arrow) runs it sounds like it sucks up water and then furnace stops heating.
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179 views

Condensing furnace short cycling

I have a strange problem. I have an IPC/Tempstar T9MPD075F12A3 condensing furnace, roughly 12 years old. It uses a Honeywell SV9541M "SMART VALVE". EDIT: Just found the service manual, checking ...
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1answer
230 views

Connect C wire to Furnace

I have a Lenox Merit system in the house. I am trying to install Nest E thermostats and want to do it with a C wire. I noticed an unused Blue Wire (pic attached) at the thermostat location and then in ...
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0answers
286 views

Furnace not igniting with error E228

My furnace is Armstrong Air, A97USMV, today when turn on, the induce fan keep running but not ignition, then stopped with error code E228 (Unable to perform successful pressure switch calibration). ...
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67 views

How can I extend the length of my furnace run time after burner shutdown?

My new furnace has a control board with preset blower run times after thermostat satisfies. Max setting is 180 seconds. This is not enough to purge the latent heat in the heat exchanger. I need ...
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1answer
29 views

Electric Furnace, no AC, blower motor starts then slows after 1 second

I have an electric furnace 240V. The blower motor starts then slows and sounds like it is laboring after about one second. It does start at full speed, however. Does the same thing when in constant on ...
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1k views

How can I fix this furnace filter slot to prevent filters bending?

I noticed a problem with my furnace filter. In the vertical slot where it gets installed, there is a channel along the bottom but not along the top. As a result, the top corner of the filter ...
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1answer
85 views

Payne gas furnace, model # PY3GNAA36090AATP. [closed]

Indoor fan blows continually, with 4 flashes on control board
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Can a pilot on a furnace be on but the thermocouple still be bad?

Heat just stopped working after working 3 days ago. All circuit breakers are looking good, gas is flowing, and furnace seems to be operating fine. Pilot is on and thermocouple is holding the flame, ...
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156 views

How long should electric furnace element last

I've been having elements go out in my electric furnace every year. Along with that, there's generally a burnt wire or two. Every about 2-3 years a sequencer goes out. Is this normal? I've been using ...
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1answer
59 views

Wall furnace burner not starting

My wall heater is not functioning. I had a similar post last year, and this year the problem evolved. Attached is the kind of wall furnace that I have. https://drive.google.com/open?id=...
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2answers
2k 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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39 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
65 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
307 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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630 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
621 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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19 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
2k 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
48 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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951 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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179 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
8k 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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2answers
345 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
951 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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78 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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64 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
5k 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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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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72 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
69 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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69 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
2k 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
460 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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103 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
186 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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2k 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
4k 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
227 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
54 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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624 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
313 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
74 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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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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