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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475 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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72 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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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
124 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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55 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
43 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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44 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
970 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
37 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
317 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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89 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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97 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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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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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
176 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
37 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
922 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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547 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
203 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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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
7k 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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45 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
54 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
526 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
62 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
49 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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1answer
78 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
258 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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773 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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51 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
931 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. ...
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51 views

Is it safe to replace a Furnace pressure switch with one of a different rating? [duplicate]

So I had some problem with my gas furnace and a technician came by to install a new one but it doesn't have the same rating and only has one tube instead of two. He assures me it's fine but I thought ...
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2answers
2k views

Is it safe to replace a Furnace pressure switch with a different one?

So I had some problem with my gas furnace and a technician came by to install a new one but it doesn't have the same rating and only has one tube instead of two. He assures me it's fine but I thought ...
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1answer
50 views

TV, Monitor reset periodically

Recently moved into this house, built in 1994: Computer monitor resets: This happens periodically (possibly when large electrical appliances kick on like the fridge), but it also happens almost every ...
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2answers
2k views

Can I install a modern furnace without ductwork?

I removed an old coal furnace from my basement. The furnace did not have any duct work to speak of. There was an exhaust pipe which fed into the chimney and a duct that went into the next room, but ...
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1answer
30 views

Why does my oil furnace cycle quickly?

I have a Rheem ROBF-067LBEA949 oil furnace as part of a forced-air Rheem UPNL-036JAZ heat-pump heating-and-cooling system, controlled by a Honeywell TH5220D1029 thermostat in its 2H1C w/ AUX ...
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1answer
60 views

What is causing intermittent furnace ignition failure? How to Diagnosis?

I have been researching how to diagnose this intermittent lighting issue with my furnace but the common issues do not seem to apply. Blower turns on Ignition coil turns cherry red Sound of gas blower ...
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2answers
1k views

Thermostat set at 65 - Furnace went to 90 - possible causes?

Oil furnace. Honeywell programmable thermostat (not WiFi-battery operated). Heat set as always at 65 degrees F with auto fan. No changes to settings whatsoever. Had been working fine all winter. ...
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1answer
2k views

Why is there a vent on the ductwork coming right from the furnace?

Why is there a vent on the ductwork coming right from the furnace? I have a typical furnace for a 1400sqft house in Michigan. I also have central air which runs through the same duct work. There is a ...
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1answer
374 views

Furnace failing intermittently, is it a faulty furnace pressure switch?

Furnace info Type: York Stellar Plus (HE down-flow condensing) Model number: P2UDD12N09501C Problem My furnace is intermittently failing, i.e. it stops producing heat. When it fails, the induction ...
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3answers
193 views

Wiring for humidifier to Goodman gmpn080-4 furnace

I have a Goodman gmpn080-4 furnace and am installing a Skuttle 190-1 humidifier. Where do I wire the two wires from the humidistat to the furnace? I see a 24v HUM screw on the board, but not sure ...
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2answers
124 views

Coleman furnace flame quits after 20 minutes

Coleman DGAA090BDTA furnace flame quits after 20 minutes, below thermostat temperature. Fails after 3 auto attempts to reignite. I power cycle unit, still does not ignite. Wait 15 minutes, ...
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4answers
200 views

Is this stuff in my furnace toxic?

I am in the process of removing an old coal furnace. after removing the natural gas conversion kit I now see some type of loose filler or insulation which was present around the conversion kit pipe. ...
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1answer
1k views

Gas fireplace is connected to the thermostat. Is there a way to disconnect?

New home has a gas fireplace that that we believe is connected to our thermostat. The fire will turn on/off continuously. Is there a way to disconnect it so we can just have the fireplace ON ...