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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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22 views

Furnace, heating when thermostat is at much lower

I have an oil furnace that heats the house with water pipes, and heats the hot water used personally. There are two thermostats used, one for the house and second for the back porch. The issue is ...
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145 views

Fan only mode not turning on blower - 2 wire blower

Our manufactured home has a colman furnace and for heating it works fine. I would like to use the fan only mode when we have the fire place going but it is not hooked up, and I just want to make sure ...
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69 views

How do I add a Venstar Add-A-Wire to my Lenox G12D2-82 furnace?

So I have a Nest Gen 3 thermostat and I am in need of a C wire. I have a Lenox G12D2-82 furnace. I have 4 wire set up. The Venstar makes 4 into 5 wires. I have a fan heat cool and power wires. There ...
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200 views

Can I just extend this blue wire in furnace for Nest thermostat?

First time doing this, don't want to burn house down. The brown bundle is coming from thermostat, the white bundle I suspect is coming from A/C unit. Do I follow these steps? Find a scrap piece of 18 ...
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25 views

Replacing Flame Sensor on Ruud Silhouette Furnace

I'm quite new when it comes to looking at furnaces. The furnace in my house recently started shutting off before getting to the temperature the thermostat is set to. Eventually we'd reset the whole ...
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52 views

Heating System Premature CutOff / DIY Options?

I've collected all of the facts about my system and the problem we are seeing. We have two external air pump units outside the house and a Rheem furnace (GH36S, 36000 BTU) that appears to be working. ...
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1answer
17 views

Draft Inducer replacement motor part number

The draft inducer motor in my Payne furnace started making a whining sound the other night, so I ordered a replacement from Ebay. My part number is HC21ZE121A, and the motor I got is missing the 'A' ...
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1answer
46 views

Carrier Furnace 58STX110-14122 fan starts the first time, but fails to start at subsequent calls for heat

On a Carrier Furnace model #58STX110-14122, when the initial call for heat comes on, everything works just fine in the following order: Thermostat sends a call for heat Draft Inducer motor kicks on ...
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32 views

AC Common wire disappears

On my furnace there is a wire that is labeled C/Common. But at my thermostat there is no common wire. Wires on furnace control panel: W - White Y - Yellow G - Green C - Common Wires at my thermostat: ...
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728 views

Old furnace with no “C” terminal for wifi thermostat

I'm new to this forum and was wondering if I could get some help regarding installing a Honeywell WiFi thermostat that requires a "C" terminal. I currently have an older thermostat that has only 4 ...
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80 views

What is this pipe?

I discovered a 12" diameter concrete pipe traveling vertically from the basement to the attic of a one story house. The pipe is lined both internally and externally with metal. I would like to know if ...
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2answers
64 views

Why is this airduct twitching and making a noise?

I have an air duct in my basement. It leads from my furnace (I think?) to the outside world. However, as you can see from this video, it is "twitching". Every second or so it jerks slightly and ...
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22 views

I have replaced the fan motor and the heating unit in a goodman electric furnace

I need an easy wiring diagram for the motor and control board. where do the wires go from the board to the heating unit? I know the heat strip has a plug in but the old strip has a brown wire and the ...
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44 views

Can a Nest work in my setup (or am I stuck with Lyric, as they claim)?

Before crucifying me for the subjective question let me clarify that my question is quite specific if you read on. I bought an old home with bad insulation and a 55-year-old furnace 3 months ago. I ...
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2answers
184 views

Water dripping from outdoor HE furnace vent

Newly purchased home (December, northeast U.S.) has a high-efficiency furnace that vents to exterior of the house. When the furnace is on, the vent drips every few seconds, creating a puddle in the ...
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1answer
2k views

Why does my furnace only work after power reset?

I’m having issues with my furnace sometimes not kicking on. I hear the furnace start, But then it will not fire. However, If I go down to the basement and flip the power switch off and on the ...
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1answer
241 views

What kind of tubing should I use for draining condensate from a furnace / boiler?

"High efficiency" & condensing boilers or furnaces produce an acidic water byproduct called condensate that has to be drained away. My boiler has an outlet fitting for this condensate water but ...
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1answer
144 views

Finding the c-terminal on my furnace

I have a two wire furnace. I’ve been doing a lot of research but haven’t found anything super similar to what I have at my house. I’m trying to find where to connect the c-wire. I have a couple of ...
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26 views

Furnace won't light when fan commanded on

House and furnace are 5 years old. Furnace is an Allied A95UH2V090C16S-07 and is interlocked to a Lifebreath HRV. Functioned fine up until a couple days ago. My wife calls me and tells me that ...
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3answers
81 views

Do HVAC technicians need to be registered or licensed? [closed]

We had several HVAC companies come out on a Sunday to look at our furnace. Unfortunately, it could not be fixed. Each contractor offered their solution and did not charge us for their time- but if ...
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158 views

Do I need a sealant between inducer motor and flue transition on furnace?

I just replaced my inducer motor for my furnace, and have noticed there is hot gas that leaks between the flue transition and inducer motor. I can't remember what it did before the switch, but it ...
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1answer
63 views

How should I repair a soot-covered cad cell on my oil furnace?

Earlier I posted about my furnace not staying on. I had my question answered fully, but seeing as it just snowed about 18 inches here I'm not in the position to call anyone to diagnose, so I decided ...
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1answer
80 views

York furnace not firing up correctly

I have a York TG9S080B12MP11A up-flow configured natural gas furnace. We have had the furnace since 2007. I am having an issue where the furnace is not starting correctly. When I power up the blower ...
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1answer
38 views

New primary control switch problems

About a week ago , I had someone to come in and replace my old RA116 stack switch with a Honeywell R8184G oil primary , for the first day it was fine, next thing I know the furnace turned off and ...
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118 views

Aprilaire 600 unit is mkaing an very loud noise when starting up

My Aprilaire 600 unit is making a very loud noise when starting up injunction with the furnace starting up. After taking the water pad off and watching the start of the furnace, the water came rushing ...
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69 views

Do I need to replace my pressure switch in my Goodman furnace?

We have a Goodman GKS9 Gas-Fired Warm Air Furnace. I've changed the air filter, cleaned the flame sensor, and checked the condensation pipes for clogs. They're clear. The behavior seems strange to me. ...
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1answer
59 views

What causes popping in new wood floor when furnace turns on?

I just had new solid wood floors installed and i hear popping where the floor meets my kitchen wall each time the furnace turns on (lasts for about 3 minutes). what causes the popping and how do I ...
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1answer
61 views

How do I create a C wire? [duplicate]

My furnace is old and only has 4 wire connections, but I require a C wire. How can I create one based on this diagram? I do have 5 wires running between the furnace and thermostat.
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1answer
113 views

How do you increase humidity with HRV system?

I’m wondering how to increase the humidity in my home. I have a venmar constructo HRV system and have looked at the manual and many videos and can’t find the answer. I’d like my humidity to be 35% for ...
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1answer
46 views

HVAC experts - what do you think about my coils? Furnace showing more than 144 degrees

I have two furnaces - one for each floor. One of the furnaces that were replaced within a year keeps blowing cold air randomly. I would reset it by turning the main power switch off/on and then it ...
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1answer
44 views

burners out of sequence with blower motor

I have a Bryant furnace plus 90 model #398AAW036060D. I just changed the blower motor. In the last five years I've changed the main board, inducer board, pressure switch, and cleaned the igniter the ...
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1answer
53 views

Home furnace not kicking on or staying on

I have a furnace question. Our house has an Amana furnace and it won't seem to kick on. For context, the temperature in the house is around 60 degrees or so. When setting the thermostat higher, a ...
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1answer
39 views

Wall grille that fits one step stair

Between my dining room and living room upstair area, there is one step down and there is a wall grille that is 5.5" tall. What drives me nut is there is no 14x5.5 grille anywhere. There is either ...
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0answers
52 views

Honeywell Thermostat to Nest E Dehumidification

I am trying to replace my Honeywell Prestige IAQ thermostats. I noticed that my downstairs thermostat has a dehumidification option (upstairs shows no such option). I checked the wiring at the ...
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1answer
97 views

Why is my thermostat turning the heat on too soon?

I have recently come across an issue with my thermostat and when and how my heat comes on. My thermostat seems to be an old round Honeywell. I set my temp at 65 typically. As of last night my ...
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3answers
5k views

Is it bad to close furnace dampers in order to balance temperatures seasonally?

I have a two story home. As such, it's always hotter on the second floor than the first floor. As advised by many articles and how-to videos out there, I usually close the dampers in the ducts ...
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1answer
101 views

Whole house humidifier when furnace is in unconditioned space

I have 2 furnaces, one in the garage and one in the attic. These are both spaces with unconditioned air, so they get very cold in the winter. The contractor who helped me configure my garage furnace ...
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2answers
58 views

Electric furnace doesn't perform a cool down stage

When my electric furnace shuts down the fan also shuts down at the exact same time. I was told that it should run for a bit afterward to cool off the coils. Doing some research it looks like this is ...
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1answer
78 views

Furnace getting power, but heat/AC not kicking on. LED on board is not lighting up. Thinking the transformer is gone

So far I've been successful in maintaining and repairing my own HVAC system in my house. First week we bought the house (we knew going into the purchase) I replaced the main board. It's been golden ...
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1answer
186 views

Furnace won’t stay running and when the blower motor runs it sounds like it is sucking up water

Part red arrow is pointing to keeps filling up with water and when the motor/fan (blue arrow) runs it sounds like it sucks up water and then furnace stops heating.
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2answers
129 views

Condensing furnace short cycling

I have a strange problem. I have an IPC/Tempstar T9MPD075F12A3 condensing furnace, roughly 12 years old. It uses a Honeywell SV9541M "SMART VALVE". EDIT: Just found the service manual, checking ...
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1answer
157 views

Connect C wire to Furnace

I have a Lenox Merit system in the house. I am trying to install Nest E thermostats and want to do it with a C wire. I noticed an unused Blue Wire (pic attached) at the thermostat location and then in ...
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0answers
133 views

Furnace not igniting with error E228

My furnace is Armstrong Air, A97USMV, today when turn on, the induce fan keep running but not ignition, then stopped with error code E228 (Unable to perform successful pressure switch calibration). ...
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2answers
59 views

How can I extend the length of my furnace run time after burner shutdown?

My new furnace has a control board with preset blower run times after thermostat satisfies. Max setting is 180 seconds. This is not enough to purge the latent heat in the heat exchanger. I need ...
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1answer
26 views

Electric Furnace, no AC, blower motor starts then slows after 1 second

I have an electric furnace 240V. The blower motor starts then slows and sounds like it is laboring after about one second. It does start at full speed, however. Does the same thing when in constant on ...
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2answers
658 views

How can I fix this furnace filter slot to prevent filters bending?

I noticed a problem with my furnace filter. In the vertical slot where it gets installed, there is a channel along the bottom but not along the top. As a result, the top corner of the filter ...
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1answer
52 views

Payne gas furnace, model # PY3GNAA36090AATP. [closed]

Indoor fan blows continually, with 4 flashes on control board
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2answers
361 views

Can a pilot on a furnace be on but the thermocouple still be bad?

Heat just stopped working after working 3 days ago. All circuit breakers are looking good, gas is flowing, and furnace seems to be operating fine. Pilot is on and thermocouple is holding the flame, ...
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1answer
76 views

How long should electric furnace element last

I've been having elements go out in my electric furnace every year. Along with that, there's generally a burnt wire or two. Every about 2-3 years a sequencer goes out. Is this normal? I've been using ...
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1answer
52 views

Wall furnace burner not starting

My wall heater is not functioning. I had a similar post last year, and this year the problem evolved. Attached is the kind of wall furnace that I have. https://drive.google.com/open?id=...