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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Yellow wire connected to C terminal, blue wire connected to Y terminal at furnace

I'm trying to install a new smart thermostat the requires a C wire. My old thermostat operated on batteries. The pre-existing wiring system of the old thermostat looked normal (ie. red wire to Rc, ...
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71 views

How do I connect a honeywell wifi thermostat with no C wire at the furnace?

I purchased a Trane XV90 furnace in 2001 & I'm upgrading the thermostat to a Wi-Fi model. This thermostat needs a wire labeled C from the furnace & of the 4 wires coming from the furnace none ...
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22 views

Nordyne Furnace Pressure Switch Faulty… Again?

I have a Nordyne KG6RC furnace. Last October the furnace wouldn't turn on. Upon investigation, it was failing due to a 'Pressure Switch Is Open With Inducer On' fault. I casually checked the intake ...
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17 views

Which brand of furnace is more reliable and lasts longer? [closed]

I'm in the market for a gas furnace and was wondering which brand is more reliable and lasts longer. Sort of like which car brands are known to last longer and/or be more reliable. Most of the brands ...
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2answers
61 views

Does this NM cable require protection?

We're selling our home and the buyer's inspector says the white cable in these photos must be protected from damage, by either a conduit or instead using a metallic cable. It's connected to the ...
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55 views

Asbestos? What do you think?

I originally thought so, but now I'm not so sure. Thoughts? It was located around HVAC vents.
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1answer
34 views

What could be causing my Thermostat “R” wire to only be 8 VAC?

I am trying to install a Nest thermostat. It says Rh not powered. I checked with a meter and I get approx 8 VAC reading. What could be causing this? The furnace itself ain't pretty. Update: ...
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1answer
42 views

Heater air intake blows out the flame

The problem I have is the air heater shutting down in windy days and I'd like to figure out how to fix this issue. Here's the setup: The back of the house faces North to an open field which gets very ...
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Nordyne furnace doesn't start at all (model gl1ra 090c-12b 903785GA)

What are the reasons this model furnace won't start at all anymore. No sound when I flip the on switch. I already tried replacing the ignitor and that didn't work. Thank you for any help!
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1answer
46 views

What causes furnaces to break in 16 to 20 years?

Why do furnaces need to be replaced in this regularly-occurring amount of time?(http://www.homeenergycenter.com/8furnace_signs.html) Is there something about the physics of the high heat and ...
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9 views

gmp050-3 goodman furnace 4 blinks cleaned flame sensor , new igniter, runs for 90 secs then shuts off?

I have olm reading on all switches. replaced igniter and the switch inside that measures the temperature when fired up
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3answers
107 views

Will a 2-stage heat pump cool my upstairs on low stage?

I am currently upgrading my furnace from an oil furnace/AC combination to all heat pump. I am considering two stage vs single stage heat pumps. I understand that two-stage will supposedly give me ...
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38 views

Thermostat doesn't control the

I have a 20 years old Weil Mclain furnace that has been working well till lately. All of a sudden, the thermostat has no control on the furnace. I changed the pilot, it worked, but still independent ...
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2answers
33 views

Condensation on cold air intake

Our home is relatively new (built in 2014), but something I noticed is that the PVC pipe going into our furnace (which connects to the outside of the home) is developing some condensation (which can ...
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35 views

Installing Honeywell wifi thermostat - weird wiring

I bought a Honeywell 7 day programmable wifi thermostat (non touch screen model). My old thermostat was wired as: Red - rh & rc Blue - b Green - g White - w I also have an unused blue wire (not ...
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2answers
44 views

Can I replace my furnace's high limit switch with a comparable third-party part?

I have an older Lennox furnace. The high limit switch (#60T15,130F) has gone bad. I haven't been able to find on-line this part number with the exact temp limit specs, and Lennox no longer carries ...
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2answers
74 views

What pipe is this?

Hello and please bear with me. I'm no expert when it comes to plumbing but I will try to be as detailed as possible. I'm trying to understand what a pipe does in my basement. The pipe seems to be ...
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1answer
38 views

Oil furnace fan won't shut off when “heat” plug is connected to control board

I was changing my thermostat and I attempted to make the swap live without turning power off. When I connected new thermostat, the fan kept running. Ruled out bad thermostat and wire short by ...
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why does my new yorker boiler start after I turn power off and back on when thermostat is asking for heat?

I have a New Yorker gas boiler for heat and tankless hot water. At times when asking for heat or hot water the boiler does not start, but if I turn power off and back on the furnace will start. Once ...
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1answer
70 views

dissolved brass fitting

this week i had to go check a problem for a long term customer that she was having with her furnace. she had had some company come in and do a furnace service, and a few days after they left, she was ...
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17 views

Furnace blowing cold air

Furnace wont produce heat. Thermostat is brand new. It Will work fine for a minute then heat come on go right back off. Can't find where filter goes house is old and vents are dirty I thought it's the ...
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3answers
134 views

Was this furnace installed properly?

I am looking to answer the following: Was this job done properly, and if not, then how really bad it is? And should I hire this contractor again ? Product: Ruud RGTM10ERBJS 100K BTU 95% ...
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22 views

My furnace has a vibration for about a second at the end of the heat cycle.

It runs fine for the approximately 15 minute heat cycle. It appears as though it happens as the thermostat is satisfied and the gas valve shuts off. The vibration is heard upstairs and throughout the ...
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3answers
65 views

Will a high efficiency furnace vent etch the brick on my house?

My neighbour just informed me that they had to change the vent on their high efficiency furnace. The furnace vents between our two houses and it used to have an elbow on it directing it along the ...
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2answers
141 views

How to address loud cold air return

The cold air return on my forced air furnace is too loud. While it is is tolerable, there is a noticeable sound of rushing air when the furnace is running (not a whistling sound, just a blowing ...
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2answers
97 views

Is this flue dangerous?

I had access to a ladder the other day, so naturally I was poking around in the attic of our house where we have lived for about a year. Above the closet where the furnace and water heater are ...
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WiFi thermostat won't run. Not sure where to connect C wire [duplicate]

I just replaced a 2 wire thermostat with a wifi one that required a c wire. There was an unused blue wire which I attached to the C connector on the transformer at the furnace. At the thermostat, the ...
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24 views

Luxaire Acclimate 8V Series manual

where can I get/download: 1) USER’S INFORMATION, MAINTENANCE AND SERVICE MANUAL for Luxaire Acclimate 8V Series Furnace, Model Number FL8V080A12UH11, year 2005 and 2) Installation manual Please, ...
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3answers
50 views

Sealing gas duct vents with silicone

Is it okay to use silicone to seal gas furnace heater supply ducts? If so, do you know how long the silicone will need to cure before the system is useable? Some background: I've been trawling around ...
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21 views

Inductor motor doesn't shut off and overheats

I have a Intertherm/NORDYNE 75K BTU furnace. It's installed in a 2200sf home. I believe it's under-powered for a home this size. When there is a filter installed and the cover is on the furnace it ...
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26 views

Gravity furnace won't turn off

Why would a gravity furnace not turn off? Tried disconnecting the thermostat and it still stayed on. Had to turn the gas off for the heat to stop.
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44 views

Constant cold air from vents with new downdraft furnace

Replaced with newer, high efficiency furnace and cold air constantly coming out of vents (except when furnace running). It's like the downdraft is totally free flowing and when windy outside very ...
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Why does my kerosene furnace stop running?

I am having issues for months now with my kerosene furnace for a mobile home. It is a beckett relay and becket flame box. I have changed electrodes, I changed eye for flame sensor, the nozzle is not ...
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1answer
21 views

Furnace fan starts slow and is getting slower

here is a sound clip, start at about :55 or listen to whole thing! https://clyp.it/3h54oe2q model is tg9s060b12mp11 luxaire, which comes up as York most places. Anyhow, what's the best way to ...
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4answers
89 views

Furnace Tries 2 or 3 times before staying on until reaching set temperature

I have noticed my furnace will cut the exhaust fan before lighting or sometimes start heating for a few minutes then stop. A few minutes later it tries again and will stay on until reaching the ...
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1answer
36 views

RUUD Furnace blowing air but not heat

I have a RUUD furnace that stopped blowing hot air last night. I was thinking that it was the high limit switch gone bad BUT the coil ignites and lights but then goes out again after a minute, so ...
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52 views

Where is this water coming from around my condensate pipe? (super confused)

Okay, so somewhat complicated story. When we bought our house 6 months ago the furnace was brand new but the AC unit was old. AC unit developed a leak that was expensive to repair, so we replaced it. ...
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2answers
208 views

Where do I connect a C wire in a Rheem Furnace REAB 1415J? [duplicate]

I'm upgrading the thermostat with a Honeywell wifi one. I found all cables at the thermostat end, but can't figure out where to connect the C wire to the furnace (Rheem REAB 1415J).
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2answers
26 views

How much difference does hot vs cold air make with regards to an Aprilaire 600 furnace humidifier evaporation rate?

If I run the humidifier only when the heat is on, I get good evaporation. However, I want to consider also running it with just the fan running because our furnace doesn't run all that often. Will I ...
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1answer
96 views

How do I wire my furnace humidifier so it comes on any time the fan is on?

I have an Aprilaire 600a humidifier from a few years ago and currently it's wired into my furnace with two control wires labeled "W/G" and "Cf". The "W/G" is connected to the W terminal on the ...
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2answers
71 views

No water pressure in heating circuit

I have a natural gas hot water furnace and I can't get heat. First I turn up the temperature at the thermostat and I hear the furnace turn on, the supply line gets hot and half way down the line it ...
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2answers
56 views

Furnace keeps kicking off and on

My furnace runs for a few min then flickers and shuts off and then the system recycles and it fires back up and the process repeats over and over and over etc....
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2answers
123 views

Very old, Coleman, through the wall (double sided) mounted gas heater not working

My home was built in 1957, I had a new heat pump system put in (which I now hate) 7 years ago. It works fine in the summer, but in winter it doesn't heat the house very well. At the time, I kept the ...
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2answers
35 views

Furnace fan runs all the time

our furnace fan runs all the time It doesn't switch off when the furnace does and keeps blowing cool air I've replaced the filter and it's still running The thermostat (RTH6400D) isn't set up to ...
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5answers
147 views

How to Lower the Ouptut of Oversized Furnace

Questions I would like to lower the output capacity of my furnace if possible. How can I do this? Is it worth doing, or should I just live with it? Is there an easy way? Some ideas: replace burner ...
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1answer
39 views

Can I replace the permanent filter in my furnace?

In my furnace (ruud ubhc-17j14sfa), there is a permanent, washable filter. It was there when we moved in 2 years ago. The house is about 10 years old now. The filter is pretty simple, more like a ...
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1answer
50 views

Pilot lights, but main burners don't on furnace with no flame sensor

I have a Rheem furnace in my house. It recently stopped working. It is the type where the pilot is not always on. Anyways, the ignition will kick in, and the pilot lights just fine. However, the ...
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2answers
61 views

Are my heat pumps using the right amount of power?

I'm trying to figure out if our two heat pumps are being power hogs and if there is something to do about it, or if they're operating normally. We bought our home recently and haven't been in it but a ...
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1answer
67 views

HVAC Contractor Didn't Install Drip Pan

I recently got the A/C unit and furnace in my basement replaced. When the company came out to do the quote, they stated that they thought I should have a drip pan, and the proposal that they gave me ...
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59 views

Can a furnace safety limit switch with manual reset be changed out with an auto reset switch?

I have a Ruud natural gas furnace from 1987. Overall it works well. I've had my home warranty service send out an HVAC tech a couple times for the high limit switch needing to be reset. It's a manual ...