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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C Wire - Williamson Furnace/Honeywell Thermostat

I'm trying to install a new wifi thermostat, but am a little confused. I have 5 wires, but none are connected to the C in the thermostat, as seen below: Additionally, when I trace the thermostat to ...
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Connecting fresh-air damper to Lennox furnace OR replacing timer with new smart thermostat

We replaced a 20-year-old furnace with a new Lennox furnace and added air conditioning. The new system is still controlled by the 20-year-old Honeywell Chronotherm III thermostat. The furnace had (and ...
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Adding central cooling to home with oil furnace but with basement height limitations and basement functionality concerns

My house is 20x30 and 1.5 stories (6' concrete basement). The basement height is just functional at 6' and I'd like to minimize obstructions (e.g. sprawling supply ducts). I'm planning to switch from ...
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Furnace pilot light goes out after burner shuts off

I have a problem with the pilot light on my furnace going out after the furnace has cycled and reached the temp set on thermostat. The problem started a couple of years ago but would only go out maybe ...
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heat is not responding to thermostat set temp but comes on when turned off and back on with the thermostat switch

At times during the day my gas burner doesn't try to come back up to the set temperature on the upstairs or downstairs main thermostat. I'll hit the up button a couple of degrees but no change. Then ...
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24vac transformer inside furnace

I'm adding a humidifier to my furnace. The included 24vac transformer fits nicely on the inner electrical box in the upper furnace compartment. I like that it keeps everything behind the external ...
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44 views

How to estimate the right size furnace for my house

I estimated the BTU for a new furnace for my house to be around 62,000 BTU. My Trane XR 90 furnace is 80,000 BTU. The square footage of my house is 1040 sq ft. Is a furnace over 18,000 BTU overkill ...
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Furnace turns off before temperature is reached, fixed by unplugging and replugging thermostat

As the title suggests, my furnace will sometimes shut off as if it's reached the target temperature, while it is still far below (ex. set to 70F, stops at 63). If I unplug the thermostat, the furnace ...
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Why does my furnace need power resets all the time?

I just installed a smart LUX thermostat and I know it's right but even with my old thermostat it was doing the same thing. My temp will be set at 70 yet its 62 in my house. I have to go to the ...
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Furnace setup switches seem to be in the wrong position

My furnace (Bryant 926TA) has to arrays of setup switches. I am particularly concerned with SW1-3 (off in my picture) and SW1-4 (on in my picture). The manual calls SW1-3 Low Heat Rise Adjustment and ...
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Inducer blower try to starts but immediately stops

I've got a Armstrong Air LP gas furnace with a Honeywell SV9520H 8034 and ST9160 blower control board and the inducer motor tries to start but immediately stop. I've can hook up power to the inducer ...
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C-Wire Williamson gsa-125-n-ip

Looking to install a C-wire for my power stealing nest. I have 5 wires up at the thermostat and same at the boiler. I am using red and white at the thermostat however it looks like blue and white it’s ...
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Does my home's gas pressure need to be checked?

Alright, my main question revolves around not understanding natural gas. Before we shell out a high dollar amount to replace our furnace and pipes and upgrade to Central heating & air, we want to ...
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Air pushing under basement door and kitchen sink cabinets when furnace runs

Whenever the furnace runs I feel a steady draft of air pushing out from under the basement door and kitchen sink cabinets. I have a mostly finished basement with registers but not return vents in ...
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Run humidifier while furnace is not heating but fan is running?

I've got a bypass humidifier mounted on my gas furnace, and an ecobee 3 thermostat driving both furnace and humidifier. What I like about having the ecobee drive the humidifier, is that it knows the ...
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High pitched whine from either the furnace blower fan or motor

There is a loud whine or scraping sound especially when the 11 year old Furnace Blower Motor/fan starts up. With power off, when I turn the blower motor fan blades by hand they make a scraping high ...
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Reline chimney or “chimney kit” on furnace exhaust

I had my brick chimney inspected, and the inspector found that the cracked clay tiles in the two flues (one for a gas fireplace, one for the furnace and gas water heater) need to be replaced. He ...
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Intermittent pilot light furnace giving up before igniting pilot light (Lennox G20 WhisperHeat)

Background: I have a Lennox G20 WhisperHeat furnace (on natural gas) with an intermittent pilot light. The unit is around 25 years old, and has functioned flawlessly until recently. The problem: ...
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Blower turns on before furnace ignites

I have not relocated/changed the thermostat or had any work done on my furnace. The fans turn on well before the furnace starts giving off warm air, which blows a lot of cold air into my home. I have ...
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Natural Gas Furnace: Lights but shuts off occasionally

Situation: Nest thermostat shows that the furnace is running, but its not and no error codes are displayed on the furnace. This happens about once per day where it seems the furnace doesn't ignite ...
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33 views

How to patch hole in furnace pipes?

I recently bought a house and the heating bill has been unusually high. I discovered there is a big hole leading to the outside that the previous owner hid, but isn't sealed properly. Their patch was ...
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85 views

Why did HVAC company add a heat outlet register venting into my attic?

I recently had a brand new HVAC system installed in my attic. The furnace is natural gas. The furnace kept shutting down after 7 to 12 minutes, due to "too much air" blowing on heat sensor ...
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33 views

Empire Wall Furnace Blower Problem

I have 35,000 BTU wall furnace with a blower motor. When the furnace heats up, the blower starts for about 2 or 3 seconds, turns off for about 5 seconds, then back on for 5 or 6 seconds, then off for ...
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41 views

Does Manometer Tubing Size Affect Measurements?

Does the diameter & length of tubing used with a digital manometer affect gas pressure readings? I'm trying to measure the outlet gas pressure going into my furnace and I had to connect different ...
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Fan in my furnace will not turn on in the manual position [closed]

When I turn my thermostat to the off position and my fan from auto to on the fan does not turn on. I have a Goodman electric furnace. Is this normal? The fan will run if I call for heat or cooling but ...
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58 views

How can I slow the cold air coming in a furnace makeup vent?

I've got an air vent from the outside which discharges right next to the furnace. I know the furnace needs this air, but a glacial breeze comes through all the time. I've found 3 options and I'm not ...
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123 views

Will the hole drilled into the furnace door cause problems? Gases etc. escaping?

I recently had a furnace service. A 3 blink code came up. The flame sensor was dirty,and a curved white pipe outside on the roof had snow inside it. The tech drilled a hole in the furnace door so you ...
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27 views

An unsteady flame when furnace is warming up

When my furnace has warmed up the house and turns off for a bit it struggles to turn back on. While the furnace is cold I can look into the combustion chamber and notice the flame is acting like ...
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1answer
28 views

Advice on Furnace water leak, should I worry?

A week back we noticed our rug in front of the Furnace was soaked. Upon investigation I found that the leak appeared to be coming from a Vent Coupling (Vent Elbow) that leads out to our roof. I ...
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When switch furnace on, ventilation fan turns off

Ventilation fan works fine when heating is off but immediately switches off when heating is turned on. Consequently the furnace runs for a minute and then overheats and turns off. Any idea what could ...
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1answer
43 views

Which limit switch controls the blower motor on my furnace?

My blower motor isn't shutting off after my heat shuts off, causing it to blow cold air into my house. I suspect that the fan limit switch is bad, but the furnace has at least four limit switches. ...
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29 views

How do I add a filter to the return air vent of my retrofitted forced air system?

I have a 1940 home with a basement and a forced air heat pump system that was added some time in the past decade by the previous owner. The ceiling in the basement is open, and the ducts were ...
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34 views

Can't get furnace to run in FAN ONLY mode

I can't figure out why my furnace is not working in FAN ONLY mode. It works fine when calling for heat, but when Fan is set to ON and there is no call for heat (or heat is turned off) the fan does not ...
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Safe to install humidifier above furnace gas vent?

I'd like to add an AprilAire 600 bypass humidifier. I plan to install the humidifier on the supply plenum, and the bypass duct on the return air. The gas vent coming off the furnace is type B. ...
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1answer
62 views

Connected C-Wire (previously unused) to thermostat, but still no power?

In search of help with hooking up a Nest Thermostat E. I have seen several threads seeking solutions for similar issues and have troubleshooted with their proposed solutions with no luck. I am ...
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Goodman 080-4, propane… inducer fan runs non stop

The unit will go thru heat cycle when turning the power on. After the call to heat is met the inducer fan continues which prevents the ignition process upon the next call from the t- stat. It will ...
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Fixing sub-optimal Tempstar furnace vent installation but can't find part numbers

I have a Tempstar N9MSE0601714A furnace with 2" PCV vent pipes (that mate to 2.5" pipes). Whoever installed it didn't fallow the installation manual and I'm also reducing the number of ...
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1answer
30 views

Zoned Forced Air System Runs 2.5X Upstairs vs. Downstairs

I bought a house built in 2005, ~4100 sq. ft. Reasonably insulated to code, as required in Chicago, IL. I've got an upstairs thermostat and downstairs thermostat. Both are Nest thermostats ...
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45 views

Should furnace blower run when the heat is off?

Our furnace blower is set to auto....it runs when the furnace is and is not calling for heat but the humidifier is on. This is a problem because the forced hot air system is blowing cold air which ...
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56 views

How can I close a gap between ceiling drywall and a furnace flue?

My gas furnace is located in my laundry/utility and is normal(~80%?) efficiency with a Type B Flue. It goes up through the drywall ceiling into my attic(1 story) and out the roof and I verified that ...
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37 views

C-Wire for thermostat

My furnace is a gmp075-3 There is an existing unused Blue wire coming from the thermostat to the furnace area but not attached to anything. (upper blue wire in 2nd image) Can I just connect the upper ...
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Why is my furnace making grinding noises after thermostat replacement?

Replaced Lux (LTX9600) with Emerson Sensi thermostat. New Sensi thermostat will control heat but have unexpected behaviors like: when thermostat turn on and off heat there is a momentary grinding ...
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Furnace keeps going into lockout

My furnace has been going into lockout after several retry cycles. This happens about 30% of the time when we turn on our heat. We had a repair person who came over quite a while ago, and tested all ...
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Connecting blue “C” wire to gas furnace, but furnace already has white wire?

sorry if this is a stupid question but I'm trying to install a smart thermostat (Nest). I realized that while there was an unused blue "C" wire behind my old thermostat, it was not connected ...
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47 views

Gas Vent Pipe - Outside Placement

I Recently adjusted the exterior furnace gas vent pipe as per the picture below. The old placement ended where the first elbow (up/left looking at the pic) is currently. However given that my 2 year ...
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Can a furnace high limit switch be bypassed for testing, and is that dangerous?

A repairman recently found that the actuator and the high limit switches were not working when our 15+ Carrier gas furnace was only blowing cold air. There are separate thermostats for the downstairs ...
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Furnace often hums but not blowing air until resetting thermostat

Having a frequent problem with my furnace where I can hear it humming softly, yet no air is coming out of the registers and the house temperature slowly falls. It seems that this state can continue ...
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51 views

Gas furnace fails to fire up and provide heat

My gas furnace won't turn on when it's set to heat. My girlfriend and I both noticed that it was a little cold today. I went to flip the heat up a notch after dinner, and that's when I noticed that ...
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Does the combustion air inlet for a 95% HE furnace need to be sloped down the same degree as the exhaust?

I'm determining if existing 2.5" PVC furnace vent pipes can be moved inside an existing soffit box in my garage ceiling. To do this the exhaust outlet pipe could keep it's existing grade from ...
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22 views

Can I run my attic HVAC/Furance without an Air Cleaner/Purifier Filter

I have an Aprilaire 1410 air purifier attached to my attic HVAC/furnace. Does the air purifier serve the same purpose as a typical air filter in a HVAC/furnace or is it simply additional filtering? ...

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