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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Old Steam Furnace

I have a old steam furnace that is running fine now but it’s not hooked up to the switch or the transformer. I have a brown wire (cable with brown insulation) containing a red and a white wire coming ...
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Thermostat turned off and furnace no longer works after doing some electrical work to a switch outlet

I was trying to install a smart switch to a double gang electrical box and unplugged wires. As I was working on the smart switch I had to disconnect everything. Much to my dismay, the switch was not ...
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My Goodman furnace shuts off

My Goodman furnace with purchase in 2015 and every year I have to clean the sensor this year it shuts off and I go in the basement and flip the switch and it comes back on it does it every 3 or 4 days
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How can we connect a smart thermostat to our heating system, which is a gas furnace and wood fireplace?

We have a KozyHeat wood fireplace connected to our older gas furnace. The idea is that the furnace serves as a fan when the fireplace is hot, or will use gas to heat the house if the fireplace is cold....
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Why is my furnace causing my electric bill to skyrocket?

I know it's the heat causing my electric bill to jump from $200ish to over $600 monthly. It runs almost constantly. It produces heat(astounding amounts) and blows it adequately. I don't think it's ...
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Intermittent Furnace Issue

So I have been having a bit of an issue with my furnace since installing the nest thermostat. The first day after I installed it was perfect. Everything was working. The second day I kept getting the ...
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15 views

Heating, and furnace making noise

Why does my Goodman gas furnace sound like a jet plane when the burner kicks on.My fan kicks on first,then the heat comes on,but sounds like a jet firing up.
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26 views

How do I purge the air from a hot water furnace with zones

I want to try and bleed the air from my hydronic ( baseboard ) heating system. It's a natural gas system, I think I understand the basic functionality but my system seems to be a bit unusual and I'm ...
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Furnace not staying on

When my heater starts up it will light and run for approximately 5 minutes and then it trips a limit switch, will not relight until I reset switch. What's causing switch to trip?
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Furnace/thermostat require constant power reset/“reboot”

I have an AprilaireProgrammable thermostat attached to York furnace?Ac unit. The set point is usually around 22 degrees, and the room temperature is reading around 20 degrees. The furnace is not ...
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58 views

How should I know if my humidifier work?

I have a Aprilaire 600 Humidifier installed in my basement, as per the manual it should automatically kick off when the lack of humidity is detected. It didn't seem happening. After I adjusted the ...
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48 views

Furnace Troubleshooting- Inconsistent Error Codes

My American Standard furnace ("Standard" Model, year 2003, 12 or 13 SEER) gave an Error Code 2 when first turned on- "External lockout, retries or recycles exceeded." (4 fail to ignite cycles ...
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Trane XL1200 furnace not heating

I have an older Trane XL1200 gas pack furnace/AC. I just tried to turn on the furnace and nothing happened. Looking at the control board the led code told me it was a pressure switch problem. The ...
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AC being turned on when calling for humidity

My newly installed Skuttle HSP2000 steam humidifier, controlled by a Generalaire GFX3 humidistat and wired to a Lennox G40UH-48B-090-14 is turning on the AC when being called for humidity. I've ...
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Ruud furnace keeps blowing 24 VAC 2 Amp fuse within 12 hours

Help! 20 year old Ruud 90 Plus condensing gas furnace with JCI G961DAJ-2401 controller keeps blowing its 24V AC 2 Amp fuse. I tightened the wires, nothing looks wrong. I measured the current for each ...
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intertherm nordyne furnace pilot light keep blowing off

I have a thermordyne standard gas valve furnace model number M1GB 090A AW. I had this problem for almost 4 years, the pilot light will get blown out after one or two runs, and I have to relight it. ...
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103 views

How to newly wire furnace condensate pump that contains a safety switch?

I would like to replace my current Little Giant furnace condensate pump that has no safety switch with the Little Giant VCMA-15ULS, 65 GPH Automatic Condensate Removal Pump w/ Safety Switch - SKU ...
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87 views

Which professional should I call for leak coming down the furnace exhaust flue?

During heavy downpours, especially ones when windy, water would begin to trickle and drip from the outside surface of the exhaust flue in the basement. Not sure how long this has been going on since ...
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The burner on my Lennox G40uh furnace will not ignite

I have a Lennox G40 series furnace and the gas valve will not open. After it does the preliminary start up I get 27V to the gas valve, but only for about half a second. Periodically the LEDs will ...
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68 views

My blower fan won't turn on unless AC is running

So first of all, I've changed nothing: same thermostat and same everything. I typically run my blower fan 24/7, but a few days ago it stopped working unless the AC is on. Which tells me that the ...
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179 views

Wiring AC condenser to Furnace

Hello So this is what I was left with I am trying to tie in fan on/off and a AC condenser I have 2 wires for my limit switch, 2 wires from my 24ac transformer, 2 wires from my AC condenser and 2 from ...
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65 views

Ecobee installation with two Rh wires, occupied G wire and HRV

I just moved to North America from Europe (hence why furnaces, HRV systems etc are totally alien to me) and I'm having trouble understanding how to wire up an ecobee3 lite to replace my Honeywell ...
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46 views

Thermostat wire does not go to Furnace

My thermostat wires go to a control panel heat pump system which go to the furnance , i need to wire a c wire but not sure how to go about this with the york control panel
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48 views

Fuel gas CSST line allowed in plenum in Texas?

I recently visited a house. The host pointed out something interesting. The furnace AC combo is in an indoor closet and is vertical upflow and sits on top of a filter base that sits on top of the ...
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65 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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53 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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32 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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307 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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69 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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203 views

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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30 views

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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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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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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88 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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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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372 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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111 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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68 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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90 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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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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47 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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70 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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1k 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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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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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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368 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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81 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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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 ...