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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How to prevent furnace fresh air intake pipe from disconnecting

I discovered my furnace’s fresh air intake pipe had disconnected where it enters the furnace. How screwed am I? How do I prevent from happening again? The pipe just sits snugly in furnace hole, ...
user216096's user avatar
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Intermittent delayed ignition, gas furnace

I have a more than 22 year old gas furnace that appears to be having a delayed ignition problem but the loud bang only happens once every few days and the HVAC tech that came over to look at it found ...
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What's wrong with my furnace blower wiring (only works on AUTO)?

Problem: Furnace blower runs fine when heating is on (no AC system installed), but does not activate independently on demand when switched ON from thermostat (i.e., running fan by itself is currently ...
Unknown's user avatar
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Extending the exhaust pipe of my furnace

I am seeking advice on a potential modification to my furnace setup. Currently, the exhaust PVC pipe outside my house is situated too close to my windows and AC, prompting me to consider extending it ...
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HVAC furnace making weird noise

when the HVAC heat running it making this high frequency noise: https://youtube.com/shorts/HCObFKIxOJ8?feature=share but the heat is working fine, should I call somebody to check?
Ming's user avatar
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Can a 1950s floor furnace be removed from below (crawl space)? [closed]

Recently demo-ed hallway desk revealed abandoned 1950s floor heater. Living room side had been patched over, hallway side has floor heater exposed. Is it possible to remove the furnace from below in ...
homeownerwithhubris's user avatar
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1 answer
92 views

How can I keep a coupling nut aligned with its bolt?

F25\F20 Westwood oil furnace filter housing. This should come from the factory with that nut very tight on the lower bolt. To replace the filter element you remove upper bolt, remove the can, change ...
Paul Mars's user avatar
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1 answer
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Gas furnace limit switch

My gas furnace limit switch had to put in manual to get heat so I bought and installed a new one after a tech came and checked everything out so I installed the new resideo and it worked fine for two ...
Phil's user avatar
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4 votes
2 answers
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Bryant furnace under water. Doesn't run now

I have a Bryant gas furnace. We got heavy rain and power out and had more than 10 inches of water in the basement before I could get a pump going. The unit is unhappy. No response to heat call. ...
BowlOfRed's user avatar
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Gas Furnace and Water Softener Drain Lines Configuration

Just wondering if anyone can explain why the drain lines out of the furnace has a loop before entering the sewer drain. As well as the drain line for the water softener being elevated above the ...
ThunderBuddies's user avatar
2 votes
2 answers
213 views

Troubleshooting Lennox furnace error code E228 -- failed to calibrate pressure switch

I have a 90% efficient Lennox furnace, pictured below. Last night the heat stopped working. It actually had stopped working maybe a couple days ago too, but it fixed itself after a few minutes--I ...
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Lennox 96% Furnace Pressure Switch Fault and Schematic Diagram

Furnace: Lennox EL296UH090XV48C - 06 Installed: August 2015 We see E227, E229 and E271 for sometime. Overall, the codes mean that low pressure switch failed to close (hence inducer stopped and furnace ...
blackroses's user avatar
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Heat Pump GE Blower Motor Rotating In The Opposite Direction

I bought a used GE 5KCP39GG R359S 1/3hp Motor, 200/230V, 1080rpm, Trane PN: D800349P01 Blower Motor that is exactly the same model as the one I’m replacing. The problem is that the newer (used) motor ...
Allen's user avatar
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Why does my gas furnace sometimes fail to start, but thermostat believes it is on?

I have a Bryant 394CAZ036100 natural gas furnace that operates normally part of the time. But at other times, though the thermostat thinks the heat is on, the furnace has failed to turn on and the ...
Brian B's user avatar
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What could cause my furnace and Outlets to go out at the same time circuit breaker not tripped

My furnace will lose power and I will lose power in the bathroom that shares the wall with the furnace but I will also lose power to the outlet in my kitchen next to my sink in my laundry room that's ...
Nicole's user avatar
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1 answer
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Can these vents be covered or removed? [duplicate]

This vent in our laundry/mudroom has two huge openings and vents directly outside (pictures linked at the end). When we bought the house, both openings were covered with a plastic film. During our ...
carolizine's user avatar
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1 answer
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Is it acceptable to wire a humidifier to my gas furnace using just the W & C wires in the control board?

I'm looking to install a AprilAire 500M humidifier on to my furnace with the main goal that the humidifier switches on only when the heating switches on. I'm not looking to have the humidifier work ...
Anton's user avatar
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1 answer
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Furnace can’t keep up [closed]

It’s been at or below zero outside for the last few days. Furnace can’t get the house over 64°. Blower is running fine. Flame looks good color. Furnace has run non-stop for 3 days now. House is ...
Bill's user avatar
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2 answers
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Need help unclogging condensate drain for furnace

https://imgur.com/a/Ov8bRGq Bryant furnace model: 912SC48060S17 We have sever weather here in Portland, OR and my Bryant/Carrier furnace is blowing cold air with status code 31. Replaced filter ...
javanoob's user avatar
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1 answer
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PVC pipe in front of furnace

There is a pvc pipe as part of the installation of my furnace. The red cap (circled) was off and water was overflowing. I pushed the cap in, but I'm concerned that, maybe, that's the wrong thing to do....
Mark Feldstein's user avatar
-1 votes
1 answer
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Common terminal question on old furnace and air conditioner with new smart thermostat

Trying to solve an odd problem with my T5 Lyric smart thermostat and an old furnace/AC. I'll try and be concise. The model of furnace is: Goodman, GMP075-4 Rev B Details, and photos below for help: ...
thegreataus's user avatar
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2 answers
78 views

Any downside to switching to 2" thick air filter?

I've been using 1"-thick Filterbuy pleated MERV 8 filters for one of my furnace air intakes (it has two). I realized recently that a 2"-thick filter would fit in there. I think that using a ...
NeutronStar's user avatar
1 vote
1 answer
114 views

Installing a thermostat with 3 wires only (red/R, white/W, and black/G)

I want to connect an Ecobee to my house, under the constraints imposed at the thermostat (pictured below); you will immediately note that there is no yellow/Y wire (because there is no air-...
Nima Talebi's user avatar
-1 votes
2 answers
93 views

How do I find the source of my furnace's condensate leak?

I bought a house in November that had a brand new high efficiency furnace put in sometime in the summer. There is water coming out of the furnace and not the drain pipe. Is this a clog in the pipe or ...
JGodfrey51's user avatar
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1 answer
49 views

Is there any chance of a problem using C terminal on furnace to wire a new smart thermostat?

Bought a house built in 1995 with I believe original Ruud Silhouette II gas furnace, central A/C, and a Maple Chase 9600 thermostat powered by two AA batteries. Upgrading to an Ecobee smart ...
user1441998's user avatar
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0 answers
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Why does the fan cycle on and off during heating cycle only?

My neighbor has an older model Carrier heat pump with electric strip heat. Here lately after she had maintenance done the fan indoor fan that is Will occasionally cycle on and off. I went over and ...
Rich Schneider's user avatar
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0 answers
37 views

Cold air until I unplug and replug in the thermostat

Why is My Honeywell thermostat reading the temperature as lower than the set temperature and blowing cold air until I unplug it and replug it in. Then it blows warm air? This has happened a few times. ...
Erin's user avatar
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1 answer
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Water dripping inside furnace

We've got a Carrier Infinity, 2 stage, high efficiency furnace. I noticed water on the floor just underneath the furnace, and can hear a metallic dripping sound. When I opened it up, I do see water ...
Brandi Gasser's user avatar
4 votes
1 answer
364 views

Connecting C Wire to Old furnace

I want to replace my existing thermostat with a new one which requires a C wire. Unfortunately I don't see a wiring diagram anywhere. I see that I have a 2 wire setup with the red being connected to ...
shreyasfifa's user avatar
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2 answers
95 views

Furnace rollback orange flame

I recently have noticed that the flames in my Amana HE furnace has went from the sharp blue flame in the burners to a less sharp, blue and orange flame. It is not to the point yet where it has tripped ...
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2 answers
445 views

Is there a way to run my furnace fan intermittently without heating the house more? [closed]

We just moved into our first house in September and it's old but surprisingly well insulated. We don't like it overly warm either so in the winter the thermostat is often set to 18°C/64.4°f The ...
MoistVonLipwig's user avatar
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0 answers
33 views

Is this crack actually on the heat exchanger? I thought the coils were the heat exchanger. Is this crack a cause for concern? Need a new system?

I discovered this crack while checking for any signs of trouble in my furnace. I thought the coils in the photo were the heat exchange system and I don't know if that strip with the crack in it means ...
Ron's user avatar
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0 answers
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I have to put the humidifier higher than normal. my problem is, I cannot place my humidistat higher than the humidifier. Can I do this

my furnace is in a closet. I have to place the humidifier higher up than just above the coils. Because of this, I cannot place my humidistat higher than the humidifier unit. It has to be lower or I ...
Doug Ehrhard's user avatar
1 vote
2 answers
71 views

How to disconnect furnace inducer from flue?

I need to replace the inducer in my ICP furnace model NTC6100GFA1. It is still working, but it has both a rattle and a high-pitched bearing whine that I'm sick of hearing. My only questions regard the ...
ybull's user avatar
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1 vote
2 answers
147 views

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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0 votes
0 answers
201 views

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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0 answers
68 views

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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0 votes
0 answers
32 views

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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0 answers
19 views

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
1 vote
2 answers
96 views

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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0 answers
44 views

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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1 vote
1 answer
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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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0 votes
2 answers
412 views

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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2 votes
3 answers
802 views

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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1 answer
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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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0 votes
2 answers
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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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1 vote
1 answer
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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 ...
J Wills's user avatar
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0 answers
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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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0 votes
1 answer
103 views

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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0 answers
40 views

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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