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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New Furnace won't turn on after trying to install thermostat

I had a furnace installed about a year ago in my basement. The installer left the wires sticking out of the wall for me to install a thermostat. He said if you want to turn the furnace on, just ...
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What can cause short life of the igniter in furnace?

what could cause short life of silicon nitride 80v,IGN00145.furnace trane xcm95 2years old put in 3rd igniter.
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Furnace blower intermittently stops working

The blower on my furnace is set to be on constantly. The last two nights in a row I have woken up in the middle of the night to hear that the blower is not running and that the temperature is dropping ...
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What could cause the furnace to not come on after airing out the house?

Turned the furnace system off and manually turned fan on at the thermostat to air out the house after staining woodwork. Now the system is turned back to Heat and Auto Fan but will not cycle on. The ...
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The hot water is working but the radiators will not heat up!

We have a Utica Boiler model number SFH4150WT and we are receiving hot water but the radiators do not heat up!!. We tried bleeding the radiators, they only heated up a little bit but after about 5 min ...
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Closing off heating ducts

We have a natural gas furnace that currently heats our entire 2400 square foot home. We plan on putting in a rental suite in the basement which will require closing up all the duct work into the suite ...
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Main burner will not light, but the pilot is ok

I have an old Heil unit 100,000 BTU, it has been working fine up until Tuesday night. The pilot light is on. I replaced the gas control valve, I know it has limit switches should I replace them all or ...
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53 views

With registers fully open I have unbalanced air flow upstairs vs downstairs

Upstairs the airflow is OK Downstairs I have 4 registers. Three out of four have very weak air flow while the fourth one is blowing like hell Is the problem in the furnace or in the air ducts?
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Asbestos in my furnace closet - should I get rid of it?

I have a home built in 1958 with a closet inside the house that contains the furnace. When the house was constructed this closet was lined with asbestos as a safety measure. How dangerous is it for my ...
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523 views

Where do I connect the C wire in my furnace?

I am upgrading my thermostat to a Nest, and would like to add a common wire. My current furnace controller doesn't have a C terminal, but the current thermostat wire has 2 unused wires (black and ...
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28 views

How do I get the main furnace blower to come on when the wood burner furnace calls for heat?

I need to know how to wire the gas furnace blower to come on when the wood burner's blower kicks on.
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227 views

How can I replace an old dial thermostat on an oil furnace with Hydrostat 3250 Plus?

I recently bought a home with an oil fired Biasi furnace that has a Hydrostat 3250-Plus attached. It uses an old analog round dial thermostat, and I'd like to replace it with a new digital (wifi) ...
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ComfortMaker GUH075 series high-efficiency (93%) furnace isn't making heat

It worked a couple of days ago but today the fan blows but the burner doesn't seem to come on. The status indicator inside the access panel flashes four times but I can't find any reference to tell ...
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61 views

Options for humidifier

Winter is approaching and the cool weather is making the air dry in our home. We're using room humidifiers but want to install a humidifier which can go on our furnace. However, we have very limited ...
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838 views

Wiggle, wiggle, wiggle wires on Furnace Pressure Switch makes it work — should I replace Switch?

My Furnace (a Rheem Criterion II Gas Furnace - model RGLH-07EAMGR) has had a problem for a while that we've just been living with but I can finally afford to do something about it. What happens is ...
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255 views

Furnace not working properly with digital thermostat

I have been attempting to use several different types of digital thermostats to replace my old mercury thermostat, however none of them are able to control the furnace properly. All of them are able ...
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67 views

Steps for annual maintenance on a fuel oil furnace?

We have fuel oil and this year I'd like to try and maintenance the furnace myself: By "maintenance" I mean "clean it up so that it runs well throughout the winter." Just a basic tuneup and ...
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63 views

Which should I do first? replacing furnace or resurfacing concrete floor?

I'm going to get two things done in my basement soon (by hiring professionals), but I'm wondering what the right order of operations is. One task is to replace the gas furnace that sits near the ...
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72 views

What could cause the blower in my furnace to come on?

Ok my blower just turned on, my propane furnace and it's not in operation due it being summer. My thermostat is set at 65 and the room temp is 78. The heater never actually fired it was only the ...
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Would a radiant barrier help stop this heat transfer?

Using my nifty thermal camera, I discovered that my furnace closet's combustion air duct (visible in this question) is getting really hot when the attic heats up, and then (being sheet metal) it ...
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122 views

Why does my furnace make sounds like a tuba when kicking on?

I have a 21 yr old Bryant furnace. Recently it started making a horrible noise when the heat first kicks on. It sounds like someone playing the tuba. It only lasts a few seconds, but it's loud ...
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63 views

Can I use my forced air furnace to heat water for radiant heat too?

I moved from Europe to USA 4 years ago and I was wondering if it's possible to combine forced air heating with the heating that uses radiators. My idea is to use the furnace for forced air to heat up ...
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Why would said gas furnace keep shutting off?

Seems that I have a gas furnace that is having some sort of heat/air sensing issue. Basically it shuts off after running for a minute or two. But if I remove the top plate of the furnace itself it ...
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288 views

How can I provide my furnace with outside combustion makeup air?

I cut a 6" opening in an insulated door into the utility room then installed a 6" metal duct with a plastic exterior vent cover. I put 6" insulated flexible duct on the interior stub and let it hang ...
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421 views

Can I manually run the blower on my Lennox G12Q3 furnace?

I have a Lennox G12Q3-120-6 model furnace. Does anyone know if there's a way to manually run just the blower without heat? There are no switches on the outside that I can see (other than the power ...
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I have a slantfin hot water furnace ,it goes on then shuts off every 2 min until. It reaches the set temp

Slantfin furnace goes on and off every 2 min until it reaches set temp
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56 views

Should I Expect Reimbursement for a 2 Year Old Furnace? [closed]

I'm having an addition put onto my home and it is significant enough to warrant a larger furnace. Unfortunately, I recently had to replace my furnace. It is a two years old Trane brand furnace, two ...
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1k views

why won't my furnace turn off once it reaches the desired temperature

I have a moncrief furnace and replaced the thermostat but the furnace will not cut off once it reaches the desired temperature. What could be wrong?
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how do you manually turn on the gas to your house?

During an account switch our gas got turned off. The account is straight now but national grid goes on coffee break from 12am sat till 7am monday and for us, enough is enough. 3 family 3 story ...