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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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What is the right way to extend a furnace intake pipe under a brick patio?

Our gas furnace intake (one of them, there are other intakes inside the house) currently comes out the side of the house but under a brick patio. It seems that the previous owner of the house extended ...
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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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Trane XV80 furnace, two wire setup, wanting continuous fan when no heat is needed

I found the "Why doesn't the “fan on” mode work after I installed a new thermostat?" thread on this site and am wondering if the manual rewire steps would also work for a two wire system. The setup: ...
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No C terminal on furnace to connect a wifi thermostat

I have an new Emerson thermostat and would like to connect a c wire so it always has power. I have an extra wire that's not being used, but I don't have a C wire terminal on my furnace. I'm wondering ...
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Pilot light keeps going out

I have a Coleman mobile home furnace and my pilot light keeps going out. I have replaced the thermocouple twice, cleaned the orfice, replace the gas regulator with a brand new one, and even crawled ...
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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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Adding split AC to a Dayton oil fired forced hot air furnace

I'm trying to add split central air to my Dayton oil fired forced hot air furnace, mod # 3E268A. The manual clearly says it can accept this but the terminal block in the unit only has (4) lugs. TT and ...
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How to troubleshoot gas supply not making it to some appliances

I recently purchased a home and once utilities were turned on I've been having issues with certain gas appliances. Some appliances required a normal amount of time to get the gas flowing after being ...
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Using existing exhaust stack for new furnace

I'm about to replace the furnace in our house. The existing furnace uses a 6" stack through the roof. I know most new furnace installations just use PVC and poke out of the wall at about ground level. ...
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1answer
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Unable to locate filter on Gas Furnace

Can not find where the filter for this furnace is. It is a gas Rheem Criterion II. Have watched YouTube videos but none look like mine. Thermostat keeps saying filter needs replacement.
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What's the right size pipe to buy for gas supply for this furnace?

I'm trying to figure out the right pipe to buy for a direct vent wall furnace. The instructions show 3/8 inch npt, and also say that the gas inlet is 1/2 inch. When I measure the gas inlet it appears ...
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Does anyone know what this type of furnace/heater is called?

I have this old style of heating but I cannot find any information on it. Can anyone help? It's gas and just sorta gets hot heating the house. No blower, no ducts, just the exhaust. The brand on the ...
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Furnace blower comes on full time when the thermostat is set to Auto

I have a Maytag furnace and the blower motor comes on right away when the thermostat is placed in auto and stays on when reaching the temperature set point and the heat goes off. I have replaced the ...
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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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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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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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1answer
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Dropped item in furnace duct

While trying to stop the ticking noise coning from my furnace ducts, I accidentally dropped a small piece of fire retardant foam (as you can see in the below photos) in one of the vertical furnace ...
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Aquatherm - thermostat is dead. What to check?

(Thermostat: White-Rodgers 1F80-51 Heating Unit is aquatherm, XUAQ22-2, this is a heat exchanger hanging off a hot water heater, and giving us forced air heat for a 500 sqft space. Unit and ...
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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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How do I stop the ticking noise coming from my furnace duct? [duplicate]

I've had some HVAC people here to look at the ticking noise coming from our furnace duct. One of them installed a brace on the piece in question. This seemed to make the ticking less frequent, ...
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4answers
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Connect two thermostats in parallel

I saw a thread about connecting two thermostats in parallel. I could not add comment to that thread , so I put question here again. My tenants always shut off thermostat or reduce temp when they are ...
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1answer
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Where to attach the c-wire inside Goodman GMP100-4 Furnace

As a relatively new home-owner, I recently came across the whole C-wire issue for the first time, having had to recently replace an old thermostat, and there is no C-wire connected inside the furnace. ...
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Goodman furnace not lighting

After a few power outages and some very cold weather, the Goodman (GMSS960803BNAA) propane furnace at our cabin is not heating. The thermostat is new/replaced (Nest) and I've checked voltages for the ...
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need to connect a c wire to my furnace/air conditioner

I installed a nest with 5 wires, but the blue wire is not connected to anything on the 25-30 year old furnace. We tried connecting the blue wire to what we thought was a common terminal, but the ...
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Are black marks on the wall over a radiator cause for concern?

I'm looking to purchase a home that has a hot water system. This home shows black marks above the radiators on the painted walls. What does this mean and should I be concerned? The previous owner ...
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Why isn't my furnace igniting?

I noticed cold air from my Carrier 58SS furnace. The main burners were not lighting. The pilot flame was strong, but yellow. When I tapped on the gas valve, the pilot shut off. I removed the pilot ...
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How can I control my furnace fan from a secondary thermostat?

I have a WaterFurnace geothermal system with upper and lower level zones. I recently added an outdoor wood burner and my issue is that I want to use a secondary stat to run the furnace fan during the ...
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What's wrong with my heater?

My heater only turns on if the temperature inside the home is 68 degrees or above. If the temperature inside the home is below 68 degrees, I can hear the thermostat click when I turn on the heater but ...
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1answer
53 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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1answer
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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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1answer
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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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1answer
37 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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Furnace continously shutting down due to lost or low flame sense (Rheem)

My furnace will run great for most of its cycle, but when it has almost reached the thermostat setting, I will hear it shut off, run the blower, then re-light. It will sometimes finally reach ...
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Why won't my furnace complete the startup sequence when powered by a portable generator?

We recently had a power outage that lasted several days and the house was down to 41 degrees and expected power restore was several days in the future. I purchased a 3500 watt (5250 starting watts) ...
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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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Replacement draft inducer motor stopped working after 3 months

My Goodman GMNT060-3 furnace stopped turning on in October. The tech diagnosed a bad draft inducer motor, because the fan wouldn't spin freely and made a grinding noise when turned by hand. I replaced ...
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Do I need a fan in my furnace room?

My furnace room is small and has a new gas furnace and water heater. I usually leave the door open to the laundry room. My garage is adjacent to a wall in the furnace room. I'm thinking of putting a 4 ...
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1answer
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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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Why doesn't my furnace start? Pilot Light ignites and continuous clicking

Why doesn't my furnace start? Pilot Light ignites up and continuous clicking. Video: https://streamable.com/i0av0 I was reading this question: gas furnace pilot light is lit,,won't produce ...
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1answer
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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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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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1answer
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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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1answer
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Propane wall furnace not firing

I have a propane wall furnance that is'nt firing, the thermostat is not appearing to trigger the unit. The pilot is fine and the thermostat is a simple unpowered one with mercury that appears to be in ...
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1answer
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How to electrically hook up my humidifier to my furnace and have it run when furnace is running and not A/C in summer

How do I hook up my humidifier to my furnace so it only runs when furnace heats my house. Just want to make sure it does not turn on when A/C in summer goes on. The person who installed my furnace ...
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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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Garage Furnace Runs Only 45 seconds at a time

I have an older Janitrol Moffat furnace in my garage. It was converted sometime in the past from propane to natural gas. It takes quite awhile for it to heat up enough for the fan to kick in and once ...
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Furnace Short Cycling

My furnace is short-cycling. I've tried the following: replaced the flame sensor Shorted the thermostat heat demand signal Checked the blower capacitor Checked the air intake filter Checked the ...