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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Should I close crawl space foundation vents in winter with a furnace present?

I am living in a house for the first time that needs proper winterization in the winter. However, the house that I am renting was built in 1941 and is rather convoluted in a lot of ways. I was looking ...
Nick P's user avatar
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Goodman gas furnace runs for ~15 minutes then shuts off for an hour before igniting again

I have a Goodman MEC96 (GMEC960603ANAB specifically) that is having a shutoff problem. It will run once for ~15 minutes, after which it shuts off for ~1 hour before coming back on again. The status ...
ChickenOverlord's user avatar
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Whole house humidifier not operating

I have a two part question focused to get my Aprilaire 560 humidifier operating. First, I've deduced that the solenoid valve is not getting power. During furnace operation (carrier heat pump and gas ...
Patrick's user avatar
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Rust developing on gas pipes inside furnace under the intake pipe. Need help figuiring out why it is happening and how to fix it. Thanks

The rust that has developed on the gas pipes from condensation coming from air intake above the furnace.
Kanwar Arora's user avatar
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BRAND NEW high eff furnace condensate pump is leaking water. I cannot figure out why [closed]

I just got a new high eff installed. Water is dripping off the bottom of the condensate pump daily. I know this sounds crazy, but I cannot recreate the leak. When I observe it, I cannot find the ...
Yamsyoms's user avatar
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Why won't my furnace pilot light say lit? [closed]

My old Gaffers & Salters furnace pilot won’t stay lit after releasing the knob. I’ve replaced thermal coupling.im thinking of replacing the gas valve with a universal gas valve but my furnace has ...
Manny's user avatar
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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
Curtis Epp's user avatar
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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 ...
Brian Battenfeld's user avatar
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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/...
Ayusman's user avatar
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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 ...
Brian's user avatar
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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 ...
Ayusman's user avatar
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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 ...
Ayusman's user avatar
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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?
Donald's user avatar
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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 ...
Alex03's user avatar
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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 ...
Gruden's user avatar
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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 ...
lerry trail's user avatar
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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 ...
Tim Everhart's user avatar
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1 answer
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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 ...
Brock Neill's user avatar
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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
Craig's user avatar
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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. ...
Robert Kearns's user avatar
5 votes
1 answer
1k views

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, ...
Ray Cheng's user avatar
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2 votes
1 answer
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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.
User1974's user avatar
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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 ...
Pete L's user avatar
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1 answer
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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 ...
Lukas D's user avatar
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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 ...
Joe Symonds's user avatar
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0 answers
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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 ...
An Nguyen's user avatar
0 votes
1 answer
42 views

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 ...
Trixie_23's user avatar
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1 answer
398 views

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 ...
risingTide's user avatar
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32 views

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 ...
The Landlord's user avatar
3 votes
2 answers
548 views

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 ...
Daanii's user avatar
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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 ...
Glabella's user avatar
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0 answers
83 views

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 ...
Anthony Massie's user avatar
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0 answers
36 views

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'...
Erica C.'s user avatar
3 votes
2 answers
321 views

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 ...
jewbix.cube's user avatar
1 vote
3 answers
80 views

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 ...
bperham's user avatar
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-1 votes
2 answers
155 views

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 ...
user170282's user avatar
1 vote
1 answer
184 views

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 ...
oldKickstart's user avatar
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25 views

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 ...
Andrew's user avatar
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14 votes
5 answers
4k views

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 ...
Resorath's user avatar
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0 votes
1 answer
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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 ...
Victor's user avatar
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0 votes
1 answer
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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' ...
Brian Andrus's user avatar
2 votes
1 answer
263 views

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 ...
basement_diy's user avatar
0 votes
1 answer
60 views

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 ...
user112697's user avatar
1 vote
1 answer
116 views

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 ...
jpQuick's user avatar
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1 vote
0 answers
108 views

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 ...
kenyons's user avatar
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2 votes
1 answer
61 views

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 ...
Lara Bernadine's user avatar
3 votes
0 answers
96 views

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 ...
Boatmarker's user avatar
1 vote
1 answer
135 views

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 ...
nickvans's user avatar
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