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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60 views

Aquatherm - thermostat is dead. What to check?

(Thermostat: White-Rodgers 1F80-51 Heating Unit is aquatherm, XUAQ22-2, this is a heat exchanger hanging off a hot water heater, and giving us forced air heat for a 500 sqft space. Unit and ...
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23 views

Why doesn't my Goodman furnace make heat sometimes?

I have a 2.5 ton 2 stage Goodman furnace. It's about 5 years old. Problem is sometimes when I start it I can hear the blower start up but no heat just cold air. This is a intermittent problem ...
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56 views

How do I stop the ticking noise coming from my furnace duct? [duplicate]

I've had some HVAC people here to look at the ticking noise coming from our furnace duct. One of them installed a brace on the piece in question. This seemed to make the ticking less frequent, ...
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315 views

Connect two thermostats in parallel

I saw a thread about connecting two thermostats in parallel. I could not add comment to that thread , so I put question here again. My tenants always shut off thermostat or reduce temp when they are ...
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409 views

Where to attach the c-wire inside Goodman GMP100-4 Furnace

As a relatively new home-owner, I recently came across the whole C-wire issue for the first time, having had to recently replace an old thermostat, and there is no C-wire connected inside the furnace. ...
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55 views

Goodman furnace not lighting

After a few power outages and some very cold weather, the Goodman (GMSS960803BNAA) propane furnace at our cabin is not heating. The thermostat is new/replaced (Nest) and I've checked voltages for the ...
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106 views

need to connect a c wire to my furnace/air conditioner

I installed a nest with 5 wires, but the blue wire is not connected to anything on the 25-30 year old furnace. We tried connecting the blue wire to what we thought was a common terminal, but the ...
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2answers
241 views

Are black marks on the wall over a radiator cause for concern?

I'm looking to purchase a home that has a hot water system. This home shows black marks above the radiators on the painted walls. What does this mean and should I be concerned? The previous owner ...
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39 views

Why isn't my furnace igniting?

I noticed cold air from my Carrier 58SS furnace. The main burners were not lighting. The pilot flame was strong, but yellow. When I tapped on the gas valve, the pilot shut off. I removed the pilot ...
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1answer
30 views

How can I control my furnace fan from a secondary thermostat?

I have a WaterFurnace geothermal system with upper and lower level zones. I recently added an outdoor wood burner and my issue is that I want to use a secondary stat to run the furnace fan during the ...
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40 views

What's wrong with my heater?

My heater only turns on if the temperature inside the home is 68 degrees or above. If the temperature inside the home is below 68 degrees, I can hear the thermostat click when I turn on the heater but ...
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1answer
66 views

Where is my furnace air filter?

We moved in to a house a few months ago and for the life of me I cannot find the air filter for the furnace anywhere. The furnace is a Payne brand. It's kind of old. In our hallway ceiling, we have ...
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197 views

Furnace blower motor starts but then starts clicking and eventually stops with a loud buzz

I have a Bryant furnace with a multi-speed blower. Yesterday I just replaced the capacitor and confirmed it is still working. The furnace turns on fine and the blower motor starts up when expected. ...
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52 views

Half of furnace turned off?

I moved into this house about 10 years ago, I noticed on the furnace that one of the breakers for the electric coils is off with a note saying "Leave breaker off". After cleaning out the blower for ...
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48 views

Furnace not heating after changing thermostat

I have an ancient furnace/AC combo that came with my apartment that originally came with a very simple battery powered thermostat, which I replaced with a modern Honeywell programmable wifi thermostat....
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71 views

Furnace continously shutting down due to lost or low flame sense (Rheem)

My furnace will run great for most of its cycle, but when it has almost reached the thermostat setting, I will hear it shut off, run the blower, then re-light. It will sometimes finally reach ...
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3answers
239 views

Why won't my furnace complete the startup sequence when powered by a portable generator?

We recently had a power outage that lasted several days and the house was down to 41 degrees and expected power restore was several days in the future. I purchased a 3500 watt (5250 starting watts) ...
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43 views

Where on the board do you hook up a humidifier

I have a RUUD Ultra series furnace. I also have a generalair humidifier. Where on the furnace board do you hook up the humidifier leads? I see HUM STAT and HUM OUT Let me know. Cheers, KW
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Replacement draft inducer motor stopped working after 3 months

My Goodman GMNT060-3 furnace stopped turning on in October. The tech diagnosed a bad draft inducer motor, because the fan wouldn't spin freely and made a grinding noise when turned by hand. I replaced ...
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48 views

Do I need a fan in my furnace room?

My furnace room is small and has a new gas furnace and water heater. I usually leave the door open to the laundry room. My garage is adjacent to a wall in the furnace room. I'm thinking of putting a 4 ...
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1answer
74 views

HVAC York diamond 80 furnace A/C

So I have a York diamond 80 furnace and the motherboard burned out so Lowe’s came and replaced it. I’ve been using the heater because it’s winter right now but the other day I accidentally hit the ...
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28 views

my high efficiency furnace shuts off during sub-zero weather

My high efficiency furnace shuts off only during sub zero weather. I've ruled out intake and exhaust clogging, and water pump problems. Do you have any other ideas about what could be causing this ...
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1answer
41 views

Why doesn't my furnace start? Pilot Light ignites and continuous clicking

Why doesn't my furnace start? Pilot Light ignites up and continuous clicking. Video: https://streamable.com/i0av0 I was reading this question: gas furnace pilot light is lit,,won't produce ...
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1answer
21 views

Ruud Furnace Problem

About 10 year old High Efficiency Gas Furnace. In Basement of private home. Slow flashing green light (minimal flame detection). Main burner will light after second try by ignitor. Unit will run for ...
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25 views

Gas Furnace Creaks When The Wind Blows

I have a Williams Forsaire Top Vent‎ gas furnace that creaks when a strong gust of wind blows. Could the venting be loose or not fitting right? Any ideas?
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38 views

Help adding C wire to furnace - Heat only system

Looking to add C wire into my furnace. Heat is currently running on two wires with older thermostats. Luckily the in wall wiring has three wires. Any help to point out the C wire for my setup? Or ...
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47 views

turn on furnace blower with temp sensor

I have a wood stove in my finished basement. I am looking for a way to turn on the blower fan of my furnace once the temperature in the basement reaches a certain setting like 75 degrees, that is ...
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1answer
70 views

Bad gas furnace install?

I just got a high efficiency condensing gas furnace installed. I feel like it was done poorly, but I'm not sure. Some questions I'm wondering about are: Do furnaces need to be level? It is visibly ...
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1answer
37 views

Propane wall furnace not firing

I have a propane wall furnance that is'nt firing, the thermostat is not appearing to trigger the unit. The pilot is fine and the thermostat is a simple unpowered one with mercury that appears to be in ...
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1answer
17 views

How to electrically hook up my humidifier to my furnace and have it run when furnace is running and not A/C in summer

How do I hook up my humidifier to my furnace so it only runs when furnace heats my house. Just want to make sure it does not turn on when A/C in summer goes on. The person who installed my furnace ...
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26 views

Do I need the “flow control” component on my furnace

Context: My furnace supplies tank-less domestic hot water to my small house. The cold water pipe going into the furnace has a "flow control" component that limits the flow to 3gpm. I understand that ...
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26 views

Garage Furnace Runs Only 45 seconds at a time

I have an older Janitrol Moffat furnace in my garage. It was converted sometime in the past from propane to natural gas. It takes quite awhile for it to heat up enough for the fan to kick in and once ...
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47 views

Furnace Short Cycling

My furnace is short-cycling. I've tried the following: replaced the flame sensor Shorted the thermostat heat demand signal Checked the blower capacitor Checked the air intake filter Checked the ...
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103 views

Is the gray insulance material asbestos? [closed]

This is a furnace room. Is the gray insulation material (on the wall and above the pipes) asbestos?
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53 views

Furnace only blows 55 degree air! Pipes freezing, please help

My brother's cabin has a heil horizontal mount attic furnace model # NTC 5100 BFE2 that runs on propane. It's about 14 years old. Only 3 of the 4 burners work, but the heat only comes out at 55 ...
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303 views

How to wire humidifier to furnace

I have a Goodman high efficient furnace with a carrier humidifier attached to the back. The humidifier wasn't working because the solenoid coil was burned, so I replaced it with a new solenoid. The ...
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95 views

My furnace blower will not turn on when on when in E-heat mode with auto fan

I have an electric furnace Carrier model FB4ANF030. I enclosed the wiring diagram. Issue: The blower fan will not turn on automatically when the thermostat is set to "Emergency heat" and "Fan Auto". ...
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61 views

Can I provide low-voltage power for an HVAC humidifier from a standard outlet?

I recently bought an Aprilaire humidifier to replace an old one that came with the house, which I thought was broken. After connecting the water (which does work and isn't clogged) and the wiring to ...
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44 views

Furnace Repair Gone Wrong?

My furnace stopped working last Saturday so I started troubleshooting to find the problem. I found that the board was not providing 110V to my inducer motor. So I determined that I needed a new board. ...
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222 views

How to stop the humming noise coming from my gas furnace when on Auto Heat?

My gas furnace makes a humming noise when on Auto Heat, like as if the blower motor or capacitor was bad. However, the blower turns on and sounds fine when thermostat is set to fan ON rather than ...
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1answer
126 views

What amperage fuse for Trane XL-80 gas furnace?

I would think this would be something that could easily be Googled, but I've tried and can't find it. We have a Trane XL-80 gas furnance and when we had an insulation guy checking out the furnace, he ...
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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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139 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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1answer
61 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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1answer
180 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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22 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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51 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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15 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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43 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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31 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: ...