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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positive pressure in a furnace room

I am planning to install an insulated exterior grade door on a finished furnace room in my basement. The room will have a hot air supply register but i read that I cannot put in a return because i ...
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Furnace heat satisfied but inducer starts and ingnition tries over and over

I have a Heil furnace 90 plus mfg 1989, Heat cycle is satisfied and thermostat is not calling for heat. Induced draft motor starts, spark igniter starts, blower starts and runs like this for 3-4 ...
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I have a bryant air handler where the power to thermostat is lost

I have replaced thermostat with a new one, changed the circuit board out twice due to wasn't getting power to thermostat. when I power up after wiring in connections. fan comes on for a moment along ...
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Rheem 45,000 BTU gas furnace wiring- 1991 year

What are Rheem 45,000 BTU gas furnace wiring connections for the older hot surface control board? 1991 year model: rgde-04nhacr
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38 views

Trane Furnace Fan Works, But Heater Won't Run

As stated, my heat isn't coming on. When this started: Everything has been all fine and dandy all winter. The other day I ran the fan only for a few hours without the heat. After this, my heat ...
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35 views

Furnace control board wiring - swapped on adaptor?

I am trying to replace my Goodman control panel (see this question), and have a wiring question. The new control panel (50M56U-843) that I acquired came with a large variety of wire adaptors. I ...
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26 views

Why doesn't my Goodman furnace make heat sometimes?

I have a 2.5 ton 2 stage Goodman furnace. It's about 5 years old. Problem is sometimes when I start it I can hear the blower start up but no heat just cold air. This is a intermittent problem ...
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66 views

Where is my furnace air filter?

We moved in to a house a few months ago and for the life of me I cannot find the air filter for the furnace anywhere. The furnace is a Payne brand. It's kind of old. In our hallway ceiling, we have ...
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210 views

Furnace blower motor starts but then starts clicking and eventually stops with a loud buzz

I have a Bryant furnace with a multi-speed blower. Yesterday I just replaced the capacitor and confirmed it is still working. The furnace turns on fine and the blower motor starts up when expected. ...
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52 views

Half of furnace turned off?

I moved into this house about 10 years ago, I noticed on the furnace that one of the breakers for the electric coils is off with a note saying "Leave breaker off". After cleaning out the blower for ...
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55 views

Furnace not heating after changing thermostat

I have an ancient furnace/AC combo that came with my apartment that originally came with a very simple battery powered thermostat, which I replaced with a modern Honeywell programmable wifi thermostat....
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46 views

Where on the board do you hook up a humidifier

I have a RUUD Ultra series furnace. I also have a generalair humidifier. Where on the furnace board do you hook up the humidifier leads? I see HUM STAT and HUM OUT Let me know. Cheers, KW
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HVAC York diamond 80 furnace A/C

So I have a York diamond 80 furnace and the motherboard burned out so Lowe’s came and replaced it. I’ve been using the heater because it’s winter right now but the other day I accidentally hit the ...
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my high efficiency furnace shuts off during sub-zero weather

My high efficiency furnace shuts off only during sub zero weather. I've ruled out intake and exhaust clogging, and water pump problems. Do you have any other ideas about what could be causing this ...
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Ruud Furnace Problem

About 10 year old High Efficiency Gas Furnace. In Basement of private home. Slow flashing green light (minimal flame detection). Main burner will light after second try by ignitor. Unit will run for ...
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26 views

Gas Furnace Creaks When The Wind Blows

I have a Williams Forsaire Top Vent‎ gas furnace that creaks when a strong gust of wind blows. Could the venting be loose or not fitting right? Any ideas?
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40 views

Help adding C wire to furnace - Heat only system

Looking to add C wire into my furnace. Heat is currently running on two wires with older thermostats. Luckily the in wall wiring has three wires. Any help to point out the C wire for my setup? Or ...
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54 views

turn on furnace blower with temp sensor

I have a wood stove in my finished basement. I am looking for a way to turn on the blower fan of my furnace once the temperature in the basement reaches a certain setting like 75 degrees, that is ...
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71 views

Bad gas furnace install?

I just got a high efficiency condensing gas furnace installed. I feel like it was done poorly, but I'm not sure. Some questions I'm wondering about are: Do furnaces need to be level? It is visibly ...
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26 views

Do I need the “flow control” component on my furnace

Context: My furnace supplies tank-less domestic hot water to my small house. The cold water pipe going into the furnace has a "flow control" component that limits the flow to 3gpm. I understand that ...
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98 views

My furnace blower will not turn on when on when in E-heat mode with auto fan

I have an electric furnace Carrier model FB4ANF030. I enclosed the wiring diagram. Issue: The blower fan will not turn on automatically when the thermostat is set to "Emergency heat" and "Fan Auto". ...
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22 views

Furnace, heating when thermostat is at much lower

I have an oil furnace that heats the house with water pipes, and heats the hot water used personally. There are two thermostats used, one for the house and second for the back porch. The issue is ...
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142 views

Fan only mode not turning on blower - 2 wire blower

Our manufactured home has a colman furnace and for heating it works fine. I would like to use the fan only mode when we have the fire place going but it is not hooked up, and I just want to make sure ...
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69 views

How do I add a Venstar Add-A-Wire to my Lenox G12D2-82 furnace?

So I have a Nest Gen 3 thermostat and I am in need of a C wire. I have a Lenox G12D2-82 furnace. I have 4 wire set up. The Venstar makes 4 into 5 wires. I have a fan heat cool and power wires. There ...
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25 views

Replacing Flame Sensor on Ruud Silhouette Furnace

I'm quite new when it comes to looking at furnaces. The furnace in my house recently started shutting off before getting to the temperature the thermostat is set to. Eventually we'd reset the whole ...
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52 views

Heating System Premature CutOff / DIY Options?

I've collected all of the facts about my system and the problem we are seeing. We have two external air pump units outside the house and a Rheem furnace (GH36S, 36000 BTU) that appears to be working. ...
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32 views

AC Common wire disappears

On my furnace there is a wire that is labeled C/Common. But at my thermostat there is no common wire. Wires on furnace control panel: W - White Y - Yellow G - Green C - Common Wires at my thermostat: ...
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80 views

What is this pipe?

I discovered a 12" diameter concrete pipe traveling vertically from the basement to the attic of a one story house. The pipe is lined both internally and externally with metal. I would like to know if ...
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22 views

I have replaced the fan motor and the heating unit in a goodman electric furnace

I need an easy wiring diagram for the motor and control board. where do the wires go from the board to the heating unit? I know the heat strip has a plug in but the old strip has a brown wire and the ...
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44 views

Can a Nest work in my setup (or am I stuck with Lyric, as they claim)?

Before crucifying me for the subjective question let me clarify that my question is quite specific if you read on. I bought an old home with bad insulation and a 55-year-old furnace 3 months ago. I ...
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151 views

Do I need a sealant between inducer motor and flue transition on furnace?

I just replaced my inducer motor for my furnace, and have noticed there is hot gas that leaks between the flue transition and inducer motor. I can't remember what it did before the switch, but it ...
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63 views

How should I repair a soot-covered cad cell on my oil furnace?

Earlier I posted about my furnace not staying on. I had my question answered fully, but seeing as it just snowed about 18 inches here I'm not in the position to call anyone to diagnose, so I decided ...
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118 views

Aprilaire 600 unit is mkaing an very loud noise when starting up

My Aprilaire 600 unit is making a very loud noise when starting up injunction with the furnace starting up. After taking the water pad off and watching the start of the furnace, the water came rushing ...
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HVAC experts - what do you think about my coils? Furnace showing more than 144 degrees

I have two furnaces - one for each floor. One of the furnaces that were replaced within a year keeps blowing cold air randomly. I would reset it by turning the main power switch off/on and then it ...
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51 views

Home furnace not kicking on or staying on

I have a furnace question. Our house has an Amana furnace and it won't seem to kick on. For context, the temperature in the house is around 60 degrees or so. When setting the thermostat higher, a ...
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2answers
353 views

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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52 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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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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1answer
203 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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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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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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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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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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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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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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52 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
68 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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1answer
53 views

1999 Goodman furnace modeld GSMS060-3

Furnace goes through the normal start up process but after 5 minutes the flames go out and I hear a click in the induction motor not the main fan. What could I check. I have taken out the flame ...
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36 views

What can cause a furnace to work worse

I have a 10 y/o trane xv80. It’s -3F in Chicago, and the furnace is struggling to keep 64F in the house, while set for 72. I don’t remember it being this bad in years past. I had the furnace taken ...
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802 views

Need Help on Adding a Common Wire for Nest

I recently purchased a Nest thermostat. After couple weeks of usage, the Nest is constantly shut down due to low battery. I search online that adding a common wire is the go solution for this. However,...