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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 this small capsule found behind my boiler?

I found this small capsule labeled 0.5560HFDDanfoss behind my boiler after routine service. It appears to be empty. It's pictured here with a Sharpie for scale. What is it?
nuggethead's user avatar
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2 votes
1 answer
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Furnace Intake Clearance

I have a flat Furnace intake grate on the floor and would like to put a piece of furniture over top of it. Whats the height clearance I need overtop? Specifically hoping to put a diy bookcase overtop ...
Hayley Fox's user avatar
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2 answers
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Furnace fan doesn't work in manual mode

I have an older Lennox furnace that was set up with R and W wires to the thermostat only. Very old 2-wire thermostat with no manual fan switch. When the thermostat kicks in to call for heat, the fan ...
Tony Mattheys's user avatar
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41 views

Do I need a new blower fan/motor?

Had the AC running and noticed the furnace started making an unusually loud noise. When I opened the panel it appears the noise is coming from the blower fan. When I spin the fan manually, it spins ...
sanwillo's user avatar
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4 answers
56 views

Furnace Exhaust Flue Behind A/C

My furnace exhaust is sitting directly behind my A/C unit. Doesn;t this pose a risk of bringing exhaust fumes into our home and potentially damaging the A/C unit? I love in the U.S. Is this a code ...
user195952's user avatar
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Propane furnace blowing cold air on a 90 degree day with the thermostat turned off

We have an older Williamson propane furnace. It was installed 26 years ago. Our thermostat is an older White-Rodgers model with just the peg on the side to slide up or down to set the temperature you ...
JOANN's user avatar
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39 views

Water heater, used to be external, and now internal, any concerns?

This question is about an external patio, which contained the water heater and furnace, in a utility closet off to the side. The idea is to close off the patio from the outside, turn it into a hallway,...
mgalpy's user avatar
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1 answer
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Correctly Calculating Air Condition Load for Service Calculation NEC 2014

I am looking to install all new kitchen appliances and wanted to see if my current service would be sufficient. I am trying to calculate the service load using Article 220 of the NEC 2014 and I am ...
GZ704's user avatar
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1 answer
32 views

Flame roll out in gas forced air furnace

I've got a Goodman forced air gas furnace. It's about 17 years old. It recently tripped the flame roll out sensor. About 2 or 3 weeks ago I replaced the ignitor on this unit, and it's been working ...
CoAstroGeek's user avatar
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35 views

Furnace blows cold air, shuts off, then blows warm air

When changing the temperature on my thermostat, the blower kicks on and only blows cold air. This drops the temperature about 2-4°. After running for a few minutes, the blower shuts off. About 30 ...
meatlifter's user avatar
3 votes
3 answers
416 views

Connecting C-wire to 1989 Forced Air Electric Heater

Can anybody figure out where a C-wire would be connected in this old forced air electric furnace? How do you test it with a multimeter to make sure? Big 240V cables are at 1 (pink circle) in picture; ...
Persil Imberbe's user avatar
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Furnace not Shutting Down Properly

I have a York Diamond 80 furnace with a newer main board. The furnace worked great all winter and just started having issues this morning. Here is what happens. I power the unit off for 20 seconds ...
Speeman's user avatar
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2 answers
65 views

Replacing blower on furnace and it’s filled with water

My blower was failing on my old furnace and I am replacing it. It sounded like there was water sloshing around inside it but I assumed it was just the bearings wearing out and that I didn’t know what ...
Charles's user avatar
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2 answers
84 views

Several furnace vent returns, but only one filter?

I have a 1980's construction house. It has a heating furnace in the attic that uses ducts to distribute the hot air to each room in the house. Recently, I bought air purifiers and I noticed that when ...
pkout's user avatar
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3 answers
104 views

Heat pump vs gas furnace return air vent noise

I'm in Seattle and considering to replace my old single stage gas furnace (88k BTU output) with either these two options. Heat pump + gas furnace hybrid AC + gas furnace The primary concern is about ...
Icyfish's user avatar
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1 answer
52 views

Furnace keeps clicking on and off without

I have a Tempstar DC90 furnace connected to a Honeywell thermostat. I’m having an issue where the furnace tries to start and making the normal startup sound, then the thermostat clicks on and off, ...
Zach Smith's user avatar
1 vote
1 answer
84 views

No air coming in through vents - Can't find blower motor to troubleshoot it

I'm a relatively new townhome-owner and I'm troubleshooting a furnace issue. My home isn't heated, and more specifically, air does not flow through the vents despite turning on the fan via thermostat. ...
ShallowBlue's user avatar
9 votes
2 answers
2k views

What kind of drain pipe appears to be clay?

The photo below shows a venting stack that was disconnected. The stack runs from the basement to the attic and out through the roof. Which means it's perfect to pull new water, gas, and vent lines ...
MFMauceri's user avatar
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0 answers
56 views

Furnace pilot light gas line, any concern with leaving extra length?

Is there any danger or issue, in leaving the furnaces pilot assembly gas tubing, with extra length and being coiled under pilot light? I replaced the gas line (1/4") in my old furnace pilot ...
mgalpy's user avatar
  • 155
2 votes
1 answer
107 views

question about neutral/ground bonding when a generator runs a furnace

Looking to power my gas furnace blower with an unbonded inverter generator. Furnace has a hard-wired on/off switch (like a light switch) at the furnace. I don't want to power the circuit at the main ...
jourdin.antonius's user avatar
1 vote
3 answers
106 views

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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0 answers
26 views

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 ...
saminpa's user avatar
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4 votes
1 answer
622 views

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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1 vote
2 answers
146 views

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 ...
Hawk's user avatar
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0 answers
15 views

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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1 answer
154 views

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
0 votes
1 answer
94 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
1 vote
1 answer
39 views

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
  • 11
4 votes
2 answers
421 views

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
868 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 ...
Rodrigo's user avatar
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0 answers
149 views

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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0 answers
14 views

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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0 votes
0 answers
16 views

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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0 votes
0 answers
27 views

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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0 votes
1 answer
64 views

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
0 votes
1 answer
101 views

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
  • 101
1 vote
1 answer
80 views

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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0 votes
2 answers
97 views

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
  • 223
1 vote
1 answer
119 views

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
39 views

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
0 votes
2 answers
184 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
2k 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
102 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
0 votes
1 answer
75 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
0 votes
0 answers
22 views

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
0 votes
0 answers
39 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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0 votes
1 answer
120 views

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
381 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
0 votes
2 answers
139 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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