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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24 views

Why would outside air come out a furnace intake?

One of my furnace air intakes appears to be letting in fresh outside air. I have three intakes on the main floor and one in the basement. The basement one is the offender as far as I can tell. When ...
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Furnace blower sometimes won't come on

I have a gas-powered forced air furnace. The last time I had a repair man look at it, he said it's 30 years old, so it's getting harder to find replacement parts. It recently developed an intermittent ...
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how to wire humidifier to circuit board

hi I have ganeralaire 1042 humidifier.it connect direct to transformer . my question is can I rewire to furnance control board. model is hk42fz0222105.just want to be active when heat is on. but I don'...
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High efficiency gas furnace part name

I'm looking for the name of the plastic piece that is labeled #2 in the attached picture. The condensate goes into the plastic box and then overflows into a tube that goes to the sump. I'm having the ...
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3answers
61 views

Does a continuously running furnace pilot light need a spark ignitor?

I have a very old gas furnace with a continuously running pilot light. The system has a spark ignitor that has recently gone bad but I'm wondering why the furnace ever had the ignitor installed if ...
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Gas furnance runs blower and signals false flame

My 7yo-ish furnace is running blower excessively. It reports (according to manual) a "false flame sensed" (5-blinks). This is NOT, however, in response to the start of a heating cycle. To ...
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Connecting C-wire in the furnace (C terminal already taken up)

Trying to install an Ecobee. This is the picture I see inside my furnace. As you can see, a redwire has already taken up the terminal marked C (?running to A/C unit). Where should I connect the C-wire ...
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52 views

Troubleshooting Gas Furnace Problems

I turned on heat at the thermostat for the first time in several months. Things worked at first with hot air coming from the vents, until a few moments later when I noticed that the thermostat panel ...
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Goodman motherboard with broken/cut wire

I have 2 Goodman furnaces with the same issue. In the middle of the motherboards there is a plug with a red wire and blue wire, and a white wire loop - pictured. My white looped wire is broken or cut. ...
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25 views

Furnace questions

You set your thermostat temperature to 75 degrees and your furnace cycles on and after sometime it reaches that temperature of 75 degrees. My question is for example, for an hour your house ...
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Is this convex bend in my furnace filter slot OK?

I just bought a house that has a two-year old Carrier central air/ furnace unit. The filter holder slot has a convex bend on the side closer to the furnace which makes little gaps between the filter's ...
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Is it a problem that my furnace filter is loose in its slot?

When I bought my home, my furnace had a 16x20x1 nominal-size filter installed, and that's what I've been buying for replacements. This size doesn't fit the opening very well; there are large gaps ...
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What are the steps to drain and refill zone for zone valve replacement?

I have a hot water baseboard (hydronic) heating system, gas boiler. Please refer to diagram of my system below. Ball valves 1 & 2 are supply. Ball valve 3 is return. Zone valves are on supply, ...
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What are these parts (for an IKEA INGOLF kitchen chair)

I want to replace these plastic widgets in my IKEA INGOLF kitchen chairs with metal ones -- but I don't know what the metal ones are called. This is the chair: https://www.ikea.com/gb/en/p/ingolf-...
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Why can't a swamp cooler and a furnace be active at the same time?

New to living with a swamp cooler. I've been told by several sources (people and internet) that the swamp cooler and the furnace can't be on/active at the same time, and indeed my landlord switches ...
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How often should ducts / furnaces be cleaned?

Asking for a house with a dog located in Canada but any general answers would be welcomed.
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2 wire thermostat wire want to be able to select fan only

I have an older furnace with only 2 wires at the thermostat "white and red". No issues at all with my system works as should. Thermostat is new Honeywell basic model not smart. I want to ...
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Closet installation of gas boiler

We have a gas-fired steam boiler (Williamson Thermoflo GSA-150) that heats our house. We're finishing the basement and would like to close off the boiler and water heater (also gas) in a small room. ...
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Does my furnace suck air from outside?

I've tried Googling this but the stakes are quite high and I don't want to be wrong, so I'm asking here. Wildfires are raging in California where we live, and the Air Quality is nearing the 'hazardous'...
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Gas furnace only lighting two of four burners

Good morning all, Long story short I have had an issue with my furnace (a Payne PG8MA) that no one has been able to resolve for a few years. I can't remember exactly how long it has been happening, ...
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Wildfire smoke : old electronic air cleaner or normal pleated filter better?

The house we live in has an old electronic air cleaner attached to the furnance. It's a Honeywell F50E 1182. We have lots of wildfire smoke in the PNW right now and am wondering if using this system ...
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1answer
22 views

Adding C Wire as simple as C to C?

Short version: I ran a new 2-strand wire from my thermostat to the furnace/air handler unit to provide spare wires since the existing 5 wires are used up and I need a C. Is hooking up the C wire as ...
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1answer
24 views

What vent type and configuration does my furnace use?

I am trying to replace my 33 year old furnace. The brand is Carrier and model is 395BAW048095. I couldn't figure out the correct vent type and configuration (down-flow, multi-position, up-flow). I ...
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39 views

Any pros and cons on relocating register on the ceiling?

I need to relocate a Heat/AC register (Labeled 2) I am planning to move it to new location (Labeled 3), kind of in the middle of the room on the ceiling. At the same time I think I need to move the ...
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64 views

Is my furnace fresh air intake correctly installed at my apartment?

I have a furnace with an uncovered air intake. I cant imagine it is pulling very much fresh air in through the duct because it is uncovered. I am wondering, is this correct? I believe there should be ...
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How to calculate efficiency of old Westinghouse furnace VS new variable speed Furnace

We have an old Westinghouse Forced Air Furnace (model FGUB137EG). It's been working fine, with the occasional pilot lighting issues since we moved in 6 years ago. We've been thinking about adding ...
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1answer
42 views

Is wiring supplying an integrated HVAC breaker a branch circuit or feeder?

Since this air handler / furnace has overcurrent protective devices in it, would my wiring from the panel then be a feeder or branch circuit? I kind of think it would be a feeder circuit. And that ...
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47 views

Thermostat wiring for fan only

I have a White Rogers 1E78-144. My house has heating only and no AC. https://climate.emerson.com/documents/ie78-non-programmable-thermostat-instructions-en-us-4209010.pdf The current wiring only ...
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How can I cover my wall furnace to prevent the summer heat coming through from the roof?

I live on the top floor of an older apartment building- I can feel the heat coming from the roof through my wall furnace (pilot light is off).
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HVAC blower comes on by itself. Even after I remove the thermostat wires

I have a rheem classic 90 furnace/AC. From the past one month, I am noticing that my blower fan turns on, runs for 2 mins and then turns off when thermostat is off. Also, when running the air ...
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1answer
30 views

Adjusting ECM motor air flow

I recently had the following Rheem ROCB furnance installed. https://www.rheem.com/product/ROCB-118P05-M It's paired with a Rheem 5 ton condenser for cooling. However, I feel the air flow is set way ...
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56 views

AC leaking into drip pan in the attic

I apologize in advance for this long post. This is the first summer in this home that I bought. I'm a first time homeowner. One day I realized a big stain in my ceiling right under the attic and found ...
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63 views

Can metal mesh furnace filters be replaced by paper filters?

We have a furnace that has wire mesh air filters, will it function/be safe to replace those filters with paper filters?
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connect switch handy box to plenum?

would it be code to attach the 2 x 4 handy box with the switch on the plenum as the old furnace set up would hook up on the new furnace with the bx cable coming off bottom of handy box to furnace ...
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29 views

Furnace fan operates only when heating is on

I don't have AC unit at my house, and summer heat is really bad when I sleep at night in my bedroom upstairs. Since I don't have AC, I think manually setting the fan "on" while I sleep will ...
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vinegar for Trane furnace

I installed a new gas heater with a condensing unit in 2019 winter. Here is the detail. My question is... Every year, I'd better pour some vinegar after opening the cap of the picture? If yes, how ...
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air filter location for Nordyne Furnace Model KG7SL 090D-35C

I'm trying to change and replace the air filter for my furnace. It's Nordyne Furnace Model KG7SL 090D-35C. Picture attached. However I can't figure out where the air filter is located. Can someone ...
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1answer
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Does lengthy refrigerant line between indoor and outdoor unit affect AC performance and result in higher utility bill?

As part of basement renovation, I am moving the HVAC indoor unit for about 30 feet, which means the refrigerant line has to be extended by same length concealed within basement ceiling. Now, I have ...
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87 views

Why is there a musty smell from my HVAC system even after coil cleaning?

I am having trouble getting rid of a smell in my AC (installed 2016), 2 visits by an HVAC professional have resulted in no luck. Problem: There is a musty smell, from all vents, as the AC is turning ...
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92 views

Why is there condensation on a pipe near my furnace?

My AC says it is trying to cool to 73 but is reading 75. I changed the filter, which didn't help. I looked in the closet, and apparently the installers were supposed to install an "auxiliary ...
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Installing a Honeywell HZ432 for four zone wireless heating

need help with wiring setup. Current setup Gas furnace (heating, no cooling): standard four zone gas furnace setup with hot water circulator 4 zones (3 wired, 1 wireless) Setup: Honeywell THM5320R (...
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HVAC / Furnace Evaporator unit in attic leaking cold air

We have an A/C (and heat) unit in the attic with force air ducts going to the ceilings in the rooms. I was in the attic today when the A/C turned on. I felt cold air come on my leg when I was near the ...
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Why is my electric furnace warm if it isn't being used?

Our furnace has not been used as the weather has been fairly warm lately. It may have turned on for a minute the previous night, but I do not know. Anyways I was walking past furnace and noticed I ...
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Trane VX99 furnace fan to run

I would like to have the fan turn on and blow non-a/c. I only see 2 wires coming from the thermostat. In
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Furnace Short Cycling - Carrier Code 33

We have a Carrier 58STA/STX Furnace that is only short cycling in Heat and not A/C. When it cuts off it is throwing Code 33 which is pointing to the following issues: Dirty Filter or Restricted Duct ...
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32 views

Why is the combustion chamber on my furnace vibrating and humming when the air conditioner is on?

I replaced the blower motor, blower wheel (squirrel cage), and run capacitor in my Goodman GMS80904BNBB furnace (1994 model I believe) because it showed signs of bearing and capacitor failure. First ...
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Is it normal for air to be leaking from this part of the HVAC?

First time living in a house. While I was cleaning (AC was also running) I noticed that somewhat cold air leaks from the circled part of the furnace on either sides. Not sure if this this information ...
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Furnace breaker wont stay on

I tried turning on the AC and it won’t run. Checked the breaker box and the furnace breaker is flipped. The breaker won’t stay in the on position When I flip it bacm. So I must have a short ...
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223 views

Wiring for 2-stage thermostat and 2-stage furnace with single stage cooling

I got my furnace and A/C unit replaced last summer. The new furnace has 2-stage heating, the A/C unit is single stage. The installers put in a single stage thermostat, so as far as I could tell it was ...
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72 views

Run Only The furnace fan

I have an old unit that has no control board. It works with a sequencer. (Coleman 3500A816) is it possible to wire it up to to be able to call only the blower to come on and not the heat as well? !

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