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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Can you use a 2 terminal furnace gas valve on a 4 terminal furnace gas valve?
How can I hook up a 2 wire terminal furnace gas valve to a 4 wire terminal furnace gas valve? Why are there 2 wire and 4 wire terminal furnace gas valves
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Nest thermostat and no C wire at my boiler
so I bought a nest thermostat and it keeps running through the AAA batteries, recommending that I use a C wire, though there's just 2 coming out of the wall (red and white). I got C wire/power adapter ...
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Energy efficient home improvement tax credit
I have been doing some reading for the tax credits available for furnace and heat pump installations.
https://www.irs.gov/credits-deductions/home-energy-tax-credits
and
https://www.energystar.gov/...
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Trying to replace old thermostat
I'm replacing my folks old thermostat.I'm trying to make sure I have all the information before proceeding. There are 3 wires but only 2 are connected. The 3rd wire is just bent around the opening. So ...
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Can heat pump completely replace natural gas furnace
My current home heating is through a natural gas forced air furnace.
I have tried to get quotes from multiple contractors.. all of them basically keep saying that I need a backup natural gas furnace ...
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How to measure gas usage by appliance
I have 3 appliances that use natural gas: Water heater, gas furnace and gas stove. How can I tell how much gas each is using so that when I make energy efficient improvements I have a way to tell how ...
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What keeps rain out of a Vertical PVC Concentric Vent?
All pics show are the Vent Cap, which is the exhaust and the inlet air cap. What is used for a RAINCAP?
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Lennox G20 Furnace Not Working
I've got a 1997 Lennox G20 furnace. A few weeks ago the blower stopped coming on after the burners turned on. The burners would come on for about a minute and then the furnace would shut down ...
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Trane XR95 No power (2 volts) to Thermostat
Trane XR95 ~2.2V at Thermostat
Woke up this morning to a cold house and a thermostat message saying “no power to the Red wire.” Measured R and C using a multimeter and it reads ~2.2 Volts. Took the ...
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Carrier Furnace Blower Motor Won't Run
Troubleshooting 25-yr old Carrier Furnace. Blower motor will not start. 24V at terminal strip (R and COM) on board. Checked all (4) limit switches; cleaned flame sensor and replaced igniter. Finally ...
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Old trane furnace won't stay lit
I have a very old trane blu080f924b2 furnace that won't stay lit. It has a spark ignitor, that clicks, and lights the gas but it burns for a few seconds and then shuts off and the ignitor starts ...
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Furnace wont stay lit
My furnace is short cycling very quickly after ignition. I put in a new flame sensor after cleaning the old one.
Then I checked each limit switch and all are closed and have continuity.
I checked the ...
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Should I replace an old furnace with a mini split unit? [closed]
I have a very small house that is close to being 700 ft.². I live in the middle of Illinois some winters it gets really cold , many degrees below zero. Last winter I noticed my furnace having a bad ...
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Furnace will not stay running
I have a Colman DGAA090BDTB, it won't run unless I cut the power for 10 seconds and turn it back on, then it will go to temp. and will not restart when temp. get low.
The furnace is 15yrs old
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Furnace wiring diagram: HUM 120 VAC or 24 VAC can be used
On my furnace wiring diagram located on the inner cover, it states that the HUM dry contact terminals can use either 120v or 24v. How is this possible? There is no reference to how to switch this.
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Why won't my furnace filter go in?
This is the first time I am replacing the filter for my furnace. The old filter is 20"x20"x1" and I got a new one that's 20"x20"x4" since there's a 4" slot. However, ...
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Where to connect a common wire to a Burnham alpine Furnace
Like many on this site I am trying to install a smart thermostat. I have 3 wires, 24V Red, white, and blue at the thermostat, but only 2 down at the boiler. My boiler is a Burnham Alpine model number ...
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Black box on chimney near ceiling in cabin
What is the purpose of the black box on the chimney near the ceiling in this cabin?
Location: Nova Scotia, Canada
I'm not sure what kind of stove it is.
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Underground propane supply line
I have a 500gal propane tank for my house that sits off the house a little. It appears that the original supply line from the tank to the house is 3/8”ID copper that I need to replace. From regulator ...
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Connecting Amana Furnace Pressure Switch
Hello fellow DIY'ers,
I had to turn on the heating for the first time this season, our Amana gas furnace didn't stay lit for more than ~7 seconds. I did some research online, ended up cleaning the ...
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Goodman MEC961 furnace glowing but not fully igniting. Suspected pressure issues
I have a a Goodman GMEC961004CN. Propane 100,000 BTU two stage furnace. I went to fire it up, and we got lots of air and no heat coming out of it. I checked the board and we had 7 red blinks. The ...
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Find furnace filter
I am a first time home owner, I tried to find and replace the filters because my Nest popped up reminding me. I have been searching everywhere around my furnace in the attic but can't find it.
It's a ...
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Adding a Fresh Air Input for Furnace
We recently purchased our first home and realized this input needs to be taking in air from outside versus the basement. Is this a project we can DIY or do we need to hire an HVAC specialist? We’re ...
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American Standard Freedom 80 Furnace Pilot Ignition Won't Light
I have an American Standard Freedom 80 Furnace (Model AUD100R936H2) that won't light. I turn on the thermostat, which works as expected, and the fan kicks on in the unit. After about a minute I can ...
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Furnace Return in basement
I have a duplex and one furnace crapped out likely because it had the return in the basement. It’s upstate NY, so it gets cold.
If I want it done 100% right. I need ducts run all the way to the top ...
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Can an occasionally squealing draft inducer motor be repaired instead of replaced?
My 13-year-old Bryant furnace has occasionally made a squealing sound during the past two winters, with the problem gradually getting worse.
I had a repairman look at it, and he said it is the draft ...
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How should I connect a humidifier to a furnace and Ecobee smart thermostat?
I have a Goodman GMVC950704CXAB furnace connected to “humidistat HSA 100 humidity dialer” which then connects to HSA 044 then connects to humidifier water valve.
I would like to replace HSA 100 with ...
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Should there be a roof vent above electric furnace/heat pump?
I have a manufactured home with a heat pump and electric furnace. Above that is a vent to the roof with an insulated duct freely hanging and unattached. Should that be there? Would it be better for ...
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Can anyone help me fix my AC unit
so we were having problems with a stripped wire that runs from the AC outside to the hvac inside so for a few days the ac did not work. We had someone come out and he ran a new wire but now the AC won'...
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Should water be dripping from my furnace condensate line onto the basement floor?
I recently had a Lennox A/C and furnace installed. The condensate line drips water into the basement floor drain, as my old one did. But now there's also a little side vent in the line that is also ...
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Old furnace no C terminal
I’m trying to install a smart thermostat and my furnace does not have a C terminal. The thermostat has an unused blue wire, and I connected it to what I thought was a common, but the unit is not ...
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Thermostat Does Not Control A/C or Heat
We have two thermostats in our house - one upstairs and one in the middle level. We are having issues with the thermostat in the middle level and have noticed the following:
We can turn on the fan ...
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Adding a C wire to an Intertherm system
I am trying to add an Ecobee smart thermostat to an older Intertherm furnace and A/C. I have extra wires running to my thermostat, but can't figure out what to connect to in the furnace wiring. Any ...
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Furnace Fan Only Turns On With Heat
Recently had a mini split installed, and the HVAC tech recommended that I occasionally turn on the fan to circulate cold air throughout the house. Tech changed the thermostat to a Honeywell Prestige ...
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What is causing the pilot light to go out with a loud clunk?
On particularly windy days like today, the pilot light in my furnace likes to go out.
To try to confirm it is the wind blowing out the pilot light through the flue, I set up a camera and recorded this ...
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No indoor blower in AC mode
I need help troubleshooting Tempstar furnace Honeywell ST9162A 1040 Board
Blower: DC motor Variable speed
Speed Control: Emerson X177265620004
Symptom: No Inside blower in Cool mode.
Outside AC is ...
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Can a Trane TWE042C150B1 be connected to a honeywell t9 smart thermostat?
I went to replace my old honeywell thermostat with an updated T9, but the new thermostat wouldn't even start up. Digging in, the 'C' connection was on the 'B' connection at the Trane. There is no 'C' ...
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Why do I have a musty smell when cooling but not heating?
I have central AC and furnace. They're both high efficiency units from Lennox. It's an upflow furnace.
Lately when I turn on the AC I started noticing musty smell. But when I change to heat, it goes ...
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HVAC Ducting - Replace during renovation?
We recently bought a new (to us, built in '52) house that has A/C and a furnace. Great. The air distribution isn't... ideal - much colder in the bedroom than other parts of the house. For the time ...
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Hole in HVAC furnace under filter normal?
I looked under the HVAC furnace today and noticed a hole near the filter installation. It seems like it should have been sealed up because air can be taken in bypassing the filter. Is this typical and ...
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Separate thermostat power source from HVAC unit for home battery backup
Here's my situation. I have two HVAC units connected to Ecobee smart thermostats. Both have C wires and were standard installs.
We are having solar panels and an Enphase backup battery system ...
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What door is recommended when I want to noise dampen my furnace room?
Our basement is being renovated. Aside from the furnace room, it will have a mother-in-law suite, a common area, a bathroom, and another bedroom. Our bedrooms, which are next to the furnace room, are ...
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Why can a common vent configuration be too big if we disconnect the gas furnace?
Our house has an electric AC and natural gas furnace heater setup. The AC is getting old and having issues, so we want to replace it, and are thinking of upgrading to an air source heat pump. We ...
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Can I short R to G in order to manually turn on the fan?
I'm replacing a faulty Aprilaire humidistat with a Arduino driven home automation system. I want to be able to have the Arduino turn the house fan on and off. If I jump the R to the G wire (or use a ...
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I turned my thermostat off on my furnace and my furnace is still blowing cold air [closed]
I turn off my thermostat on my furnace and my furnace is still blowing. And it is blowing cold air.
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Electric furnace install wiring
I just purchased an MBR1200AA1 with 20kw heat strip from goodman to replace an old furnace from the 70s thats recently gone beyond simple repairs.
Want to install it but came across 2 breakers, one ...
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Gas furnace takes like 2-5 minutes from ignition to blower start. flame also burning yellow/orange
It's still heating the house which is why we have never considered it a problem so far this season. However I recently got a smart thermostat and really started noticing how long the startup takes to ...
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How can I control the speed of this AC motor?
I have this old 1/3 HP AC Motor attached to a furnace fan that I want to control the speed of. I want to slow it down. I have done a lot of research, but I am not an electronics engineer so I get ...
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What would cause a furnace to randomly fail to light roughly once a week?
Roughly once a week my furnace will shut off. No error codes are flashing. I turn the switch off and turn it back on and it will relight without an issue or error. There was a single occasion where it ...
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We have a one year old modulating Goodman furnace that vibrates on high fan
We've had it for about one year. The last part of its heat cycle it goes to high fan. When on high the furnace shakes and vibrates the main trunk of ductworks. This has been going on for a month. The ...
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