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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Overheating/airflow issue with gas furnace: 3 different HVAC techs, 3 different diagnoses

I'm a new homeowner (1.5 years), and there was a new gas furnace installed just before we moved in. A month or so ago, the furnace started making a whistling noise for a second or two just at the ...
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What is the small thermostat on my oil furnace for?

We have three thermostats: one controlling the heat on the ground floor, one other controlling the heat on the 2nd floor, and one tiny one located at the front of the furnace itself. It has a dial ...
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49 views

how to meter natural gas usage in a part of the home

I rent my basement out. It's currently heated via electricity. It's cold where I live, and my renter's electric bills are high. I'm thinking of installing a natural gas wall furnace in the basement. ...
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Water dripping from a gas vent thats connected to my furnace

I just noticed when I opened the closet where my furnace is located there was water in the middle. It appears to be leaking from 2 spots on a vent that's labeled the (gas vent connector) its sunday ...
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Would it be dangerous to tap an existing flame sensor circuit to create a common connection for my thermostat?

I'm considering using this answer to connect a common wire to my thermostat. I have the exact same setup, and have verified with my multimiter that the red T terminal outside F terminal beeps, while ...
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Pilot light goes off when depressing button ; new thermopile / vent switch

I have a Empire GWT-35-2 wall heater, when the thermostat would kick it on, it would turn off before reaching target temp. Would light and this would repeat until recently I can't get the pilot light ...
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Bryant 355 furnace not heating

My furnace runs and trips roll out without blowing warm air, I suspect the inducer isn't running fast enough. I watch it kick on and the inducer runs fast but right when it lights the inducer slows ...
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4answers
74 views

Is DIYing a replacement of Electric Furnace and Air conditioner worth it?

My Air conditioner does not produce cold air, however heater part in Furnace works just fine. Air conditoner Unit is at least 20 years old and have no coolent left in the system. I am looking to ...
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Replacing 1-Stage Furnace & A/C for Comfort & Efficiency

Need opinions on imminent HVAC work in a Massachusetts home. House and HVAC system descriptions below: House: ~45yrs, 1850 sqft, 2 floors + unfinished basement (furnace located in basement). Each ...
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1answer
48 views

Possible to "soundproof"/reduce noise from First Floor Furnace/AC?

We have a 1080 sq. ft., 1-floor (no basement) house. Our furnace and cold air/AC returns/registers are literally almost in the living room/main sitting area and it's very loud year round, making for a ...
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How to route/replace HVAC plenum/trunk lines through a poorly designed foundation wall hole with a gas pipe in the way on the other side

New homeowner of a 1959 constructed house. Surprisingly, only 4 owners (including myself), with the last 2 each having it for about 20 yrs and each seemed to be DIYers - not necessarily choices I ...
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52 views

Is it possible to add a C-wire to a Honeywell R7284 Oil Primary Control (current two-wire system)?

I currently have a two-wire system (R/W) going to my thermostat. The furnace is an oil heat system with a blower to force air. There is currently a Honeywell R7284 Oil Primary Control where the ...
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22 views

How should I troubleshoot a furnace with a possible control board issue?

I have 3 units of furnace in my house (brand: Lennox model: c33-36A-2-6), each cover a floor of my 3-story-house (basement included). The unit covering the 1st floor stopped working a couple days ago, ...
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27 views

Furnace won't turn back on after leaking collector box diagnosed

We had water leaking from under our furnace, so we called our an HVAC repair company. Their tech opened up the furnace and determined that we have a leaky collector box. He ordered he replacement ...
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3answers
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How to size inducer motor capacitor?

I have an ICP gas furnace which won't start and I've diagnosed the problem to a bad capacitor on the inducer motor. The motor spins freely and measures good resistance, so I'm going to try replacing ...
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25 views

Where to replace heat return vent

I live in a 12,00 sqare foot ranch. The furnace is in the basement but both return registers are on the main floor right opposite each other in the main hallway. I'm remodeling my main bathroom. The ...
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Aprilaire 600 to Fedders furnace

Wiring issue. I have installed the unit, an Aprilaire 600. When the humidifier is OFF, the heat and fan operate normally. However, when the humidifier is ON, the heat and fan come on normally but ...
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1answer
61 views

How important to replace Furnace pressure switch with the one from the same manufacturer?

We have 2004 Furnace American Standard and Nest thermostat.When I turn heat on the Nest it starts the furnace but no heat comes from the vents. We called one local company and tech person came, spent ...
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47 views

Furnace starts but Blower doesnt start

I have been having challenges with my furnace starting last winter. Every now and then the furnace doesn't start. When I go down to HVAC and open the panel and force it to restart, I see the filament ...
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68 views

Servicing my furnace

So every year I would have a technician come out and service our furnace. I'm not sure what all it entails to service our furnace, aside from changing the filter, but last year I learned quite a bit ...
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2answers
129 views

Adding a C Wire using a 24V AC Transformer to a 2 Wire Heating System for Nest

Continuation from Can I use any of my existing oil control terminals (TTFFAA) for a C wire? EDIT: Wanted to finally say this is SOLVED with help from @JPhi1618 (see conversation below). If you have a ...
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85 views

Replace Heat Exchanger on 15 year old furnace? [closed]

I've got two Carrier furnaces in my basement; 90% efficiency / 100k BTU and 60k BTU. Both are 15 years old. These Carrier furnaces are known to have fault secondary heat exchangers and Carrier (via a ...
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1answer
55 views

Can I use any of my existing oil control terminals (TTFFAA) for a C wire?

I, like many other, similar users on this site, am trying to install a WiFi-enabled thermostat. Hopefully there isn't a prize for oldest system. My current system setup is: Oil furnace (Heat only / ...
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45 views

Cracked heat exchanger or bad inducer motor causing pressure switch stuck open?

15 year old York GY9S furnace won't fire due to pressure switch stuck open. It has two pressure switches. One switch connects to the collector box & is set to close at -.40 inH20. I got -2.20+/- ...
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28 views

Popping sound coming from duct

Whenever the furnace is turned on or off, there’s a spot right below my bedroom floor where vent is, the duct would make a popping noise for about 5-10 minutes. Unfortunately the duct is not ...
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31 views

What is start up watts or amperage for 1/2 hp 7.1 amp Rheam Furnace?

What is start up watts or amperage for 1/2 hp 7.1 amp blower plus all componets 75,000 BTU Rheam RGPN-07eamer? What is running wattage?
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74 views

Can I slow the formation of cracks in a furnace by running lower temperatures?

Just had a tech out today. Gas pressure was up way higher than it should have been so he reduced it (he said it was a 7 something and it should've been 3.4?). CO detectors not going off but they are ...
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1answer
55 views

Furnace is short cycling after running continuously

My thermostat stopped working, so I tried to hard wire the connection to make it through the night. When I woke up the furnace was off and trying to start it now the inducer seems to turn on for a few ...
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1answer
78 views

Inducer motor turns off immediately after the pressure switch closes

My furnace is not working properly (ICM2805A control board, or Nordyne 624631A). When I turn it on, the inducer motor will start spinning and shut down immediately, the board will reset, and try again ...
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2answers
81 views

Figuring out the furnace filter

Recently moved into a new home and am trying to get new furnace filters. The house has this unit: https://www.ecomfort.com/Goodman-ARUF49C14/p58566.html , which looks like its called an Air Handler. ...
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1k views

furnace condensate - system to collect and then drain periodically

We have a condo in Northern WI that gets used sporadically over the winter, we keep the furnace running at a low temp while we are not there. Last winter the furnace condensate draining into the ...
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62 views

Need I needed AC/Furnace replacement, or I can delay it for a year or two

I'm living in the Northeast of the US, so my ac/heat units are 12 years. My current setup is like this: Heat-pump on unit outside the house, and a furnace unit in the attic. The heat was not able to ...
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1answer
17 views

Criterion 2 electronic ignition 3 rd burner not lighting

On my furnace all sequences run thru fine but occasionally the first burner ignites the second takes off but the third doesn’t what could this be
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164 views

Can a thermostats C-wire be connected to the furnaces R-terminal without issues?

I was looking around at my furnace wiring to see if my C-wire was connected on the furnace side and noticed that the C-wire from the thermostat goes to the R-terminal on the furnace. This doesn't ...
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83 views

New gas furnace...... installer used old non polarized plug from previous furnace

Have a new 60kbtu furnace. Installer used power cord from old dinosaur (non polarized). This was unknown by me until last week, 6 months after install. We lose power up here a lot, and after the last ...
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2answers
49 views

Carrier Comfort 80 Ignition Proving Failure

It's getting chilly here in California and I'm having an issue with keeping my Carrier furnace fired up. I have a Carrier Comfort 80 Deluxe (Model# 58DLX070-08). When reset, the blower runs and fires ...
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1answer
99 views

What fixed my heating system?

My Emerson WiFi thermostat stopped connecting but otherwise seemed to be working fine so I followed troubleshooting steps and replaced the batteries with fresh ones. This failed to solve the problem, ...
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34 views

Goodman furnace flame out

New Goodman furnace. Starts ok, but then the flame blows out when the main blower fan starts. Furnace attempts to restart, but flames out again immediately. I get no error codes. I dont think it’s ...
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2answers
40 views

New Goodman furnace installation won't light

I've installed a new Goodman furnace (96% efficient). I'm trying to test fire it with a 20 lb propane tank. The gas valve has had the propane conversion springs put into both the high and low fire ...
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1answer
45 views

Two filters in furnace

My recently-bought house has a Rheem Criterion II gas furnace (model RGPH-15EARJR). Here is the manual: https://www.questargas.com/ForEmployees/qgcOperationsTraining/Furnaces/Ruud_GPH_GPJ_GLH_GLJ.pdf ...
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1answer
98 views

Why does this pipe on my furnace blow out hot air

When the HVAC works on heating mode, this pipe and the gaps around it are blowing out warm air. What are they and why?
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1answer
93 views

Is my furnace switch wired to code?

I have a goal to replace all the switches in my house and then pass inspection. I'm following NEC 2020, and must meet NEC 2008 for the local code. Everything was going well until I removed the cover ...
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1answer
50 views

No “c” wire terminal on my furnace

My furnace doesn’t seem to have a “c” terminal I can hook up my adapter to for the nest smart thermostat. My terminals are numbered instead of lettered. I tried them both but the thermostat still had ...
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1answer
38 views

attached electrical junction box to furnace, how to protect wire

I'm connecting a handy box to a furnace, it's attached to the side. There is a cutout on both the box and the furnace. What is typically done in this situation to protect wires from the box to ...
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19 views

Furnace error 33. Limit switch tripping

Furnace runs for a few minutes, then limit switch trips when it reaches 32.5 celsius. System worked before. No changes. Same happens without filter Vents are not blocked Cleaned heat exchanger Tested ...
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Does there exist a standard for furnace UV lights?

When you're replacing neon light tubes you don't think twice about compatibility. The distance between the two pairs of pins on opposite sides of the tube is a fixed standard, the voltage (in one ...
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3answers
38 views

Adding a C wire or Google Power Connector to an old Lennox furnace

As the title suggests I am looking for advice on connecting a C wire or hooking up a Google Power Connector (I have it already) to my furnace. I have a Lennox G803, it already has a humidifier ...
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183 views

Can I replace this old mercury thermostat with a digital one for wood/oil furnace?

I recently moved into a house that was built around 1999, and it has an old Newmac wood/oil combo furnace that seems to be the original heating equipment. It has two separate thermostats in the ...
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2answers
141 views

Please help me find the right spot to tap into for C wire at the furnace

I am trying to upgrade our thermostat to a Wifi unit that needs a C-wire. Found the unused C wire at the thermostat end and connected it. AC wouldn't power on, went to furnace end and found it wasn'...
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85 views

Should I run my furnace fan 24/7?

I have a house with four heating zones, three of which are pertinent to this question. A standard summer day might look like this: Top floor - 23c-24c (slightly too warm, AC on most of the time on ...

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