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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76 views

Does my utility room need fresh air? If so, possible solutions?

Our home has a ~ 13' x 12' utility room that houses our HVAC system and gas hot water heater. Adjacent to this room is another room that we would like to use for an office. Currently those two rooms ...
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25 views

Furnace keeps triggering pressure switch

I have a York (Coleman) TM9X060B12MP11B furnace that is about 7 years old now. For years I have had the issue that if it's cold outside, and often when it has been snowing, in the morning it kicks ...
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What is this noise coming from my furnace?

There is a noise that emanates from my furnace before the heat starts to blow into the house. What is it? Should I be concerned? Video: https://youtu.be/A3F7afbI_a0
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Doorbell Transformer

Trying to install a nest doorbell but need to change the transformer. I believe I found it here but it is attached to a switch next to the furnace. When I unhooked the wires the doorbell stopped ...
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WiringTrouble With replacing blower motor in my furnace

When replacing the blower motor in my furnace I notice the old blower motor had a Brown and a Brown and white wire going to the furnace off of the motor the new motor however does not Instead it has ...
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Why is one of my four baseboard heat zones not working?

No heat in baseboard. How to bleed just one zone. Thanks! Please see picture. ? I have a 4 zone valves. 1) water heater (works) 2) 1st floor air handler (works) 3) 2nd floor air handler (works) ...
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32 views

What amp rating fuse should be used for the low-voltage side of the control board in my Goodman furnace?

I have a Goodman furnace (model GMH80803BNBC) (with separate Goodman AC condenser). The specs (PDF) are located online. The control board has stamped on it, next to the fuse (for the low-voltage (24V) ...
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1answer
54 views

No power coming from c terminal on furnace

I am trying to set up a nest. My system was a simple heat only R/W wire set up. I attached the green wire to the c terminal on my furnace, but no power is being fed from it, or at least the Nest is ...
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Part on furnace making scratching noise

This spinning part on my furnace (not sure what the part is called) is making this scratching noise. When one section of the part hits the area behind it, it makes that noise. Any idea how I can ...
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Old Steam Furnace

I have a old steam furnace that is running fine now but it’s not hooked up to the switch or the transformer. I have a brown wire (cable with brown insulation) containing a red and a white wire coming ...
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19 views

Thermo Pride OL5-85 oil furnace and Aprilaire 60 humidistat

I have a Thermopride OL5-85 furnace. I've recently added an Aprilaire 600 humidifier, which comes with the Aprilaire 60 humidistat. Wiring diagrams for both are attached below. The humidistat is ...
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38 views

Thermostat turned off and furnace no longer works after doing some electrical work to a switch outlet

I was trying to install a smart switch to a double gang electrical box and unplugged wires. As I was working on the smart switch I had to disconnect everything. Much to my dismay, the switch was not ...
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My Goodman furnace shuts off

My Goodman furnace with purchase in 2015 and every year I have to clean the sensor this year it shuts off and I go in the basement and flip the switch and it comes back on it does it every 3 or 4 days
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How can we connect a smart thermostat to our heating system, which is a gas furnace and wood fireplace?

We have a KozyHeat wood fireplace connected to our older gas furnace. The idea is that the furnace serves as a fan when the fireplace is hot, or will use gas to heat the house if the fireplace is cold....
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Why is my furnace causing my electric bill to skyrocket?

I know it's the heat causing my electric bill to jump from $200ish to over $600 monthly. It runs almost constantly. It produces heat(astounding amounts) and blows it adequately. I don't think it's ...
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27 views

Intermittent Furnace Issue

So I have been having a bit of an issue with my furnace since installing the nest thermostat. The first day after I installed it was perfect. Everything was working. The second day I kept getting the ...
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Goodman furnace - intermittantly works (80% of time works, then one blink (ignition failure)

Goodman furnace - works most of the time. Then, it will give the one-blink indicator of ignition failure. We either wait for it to cycle (which can take 30m-1hr) or turn off the power to the furnace ...
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50 views

Can 2 stage furnace be forced to stay in low?

Can 2 stage furnace be forced to stay in low? My airflow noise (and duct pops) is loud enough to wake me up, so I want to test if low reduces this problem enough before I rip into the finished spaces ...
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85 views

Sticky black liquid coming from Furnace / AC Unit

I have this sticky black liquid slowly leaking from my gas furnace / ac unit. I called an HVAC repairman and he wasn’t sure what it was. He said he thinks it’s an old drip pan made of tar (not sure ...
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38 views

No C terminal on furnace. Workarounds? Possible the AC?

I'm Trying to connect my C wire to install a new thermostat but the furnace doesn't have a C terminal. In my readings on this I found that because I have an AC,I can connect my C to one of the wires ...
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1answer
26 views

Furnace Fan (Heat Pump) having issues when starting sometimes with a buzzing noise

We have a Central Electric Furnace model # EB12B. It is paired with a heat pump. We noticed the issue when we were running the A/C this year and is has continued while running the heater. When the ...
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15 views

Heating, and furnace making noise

Why does my Goodman gas furnace sound like a jet plane when the burner kicks on.My fan kicks on first,then the heat comes on,but sounds like a jet firing up.
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Gas furnace ignites but then makes large knocking sound

My gas furnace will ignite, but after the pilot goes on for a moment it creates a large periodic knocking sound over and over again instead of the fan starting. I have my suspicions, but I wanted to ...
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121 views

(SOLVED) What is a whining, high pitch sound coming from my furnace when heat kicks in

EDIT: SOLVED. IT WAS THE FLEX CONNECTOR. THANKS EVERYONE. My gas furnace makes a high-pitched whining sound when the burners turn on (when I can see fire). A repair man came and told me it may be that ...
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4answers
183 views

Considerations for installing a high efficiency furnace in my attic?

I live in Upstate NY and in the winter it gets below 0° F. I currently have baseboard water heating throughout my home. Prior to this I believe there was a gravity furnace which supplied the house ...
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27 views

Tempstar 2 stage furnace restarting every 7 minutes - not going into high

I have a tempstar 9MPT model based furnace. Also sold under a number of other brands - comfort air, etc. It is a two stage heating with a PSC motor high efficiency furnace. After about 7 minutes of ...
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31 views

Thermostats with or without variable temperature differential (swing)

I am looking at replacing my thermostat, and don't really need or want one with geosync. I am thinking of the honeywell RTH9585wf. Currently I have a lux that is not wifi but programmable. It ...
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Water Dripping From HVAC Furnace PVC

I have 2 PVC pipes coming out of my TRANE gas furnace. Today I noticed that one is dripping water from the top. Picture attached. Its a slow drip. What could this be?
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Tempstar (ICP) furnace short cycle (runs 10 -15 minutes) then repeats

I have a tempstar (ICP) furnace put in when the house builder built the house. Model is N9MPD075F12A2. Installed late 2009. This problem only happens with the furnace not the AC. When calling for ...
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1answer
21 views

How do I purge the air from a hot water furnace with zones

I want to try and bleed the air from my hydronic ( baseboard ) heating system. It's a natural gas system, I think I understand the basic functionality but my system seems to be a bit unusual and I'm ...
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2answers
36 views

Oil burner runs for at least one cycle then safety locks out

I have an older Slant Fin Liberty oil furnace that safeties out sometime around 4 hours. It seems to be intermittent because I have seen it do more than one cycle. The recent history on it is about a ...
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82 views

Neighbor's furnace exhaust

My neighbor's house sits 20ft from mine. Their furnace exhausts out the side of their house about 3 ft above the ground. The exhaust is blowing onto the side of my house and into the attic vent. ...
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27 views

Furnace not staying on

When my heater starts up it will light and run for approximately 5 minutes and then it trips a limit switch, will not relight until I reset switch. What's causing switch to trip?
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17 views

Furnace/thermostat require constant power reset/“reboot”

I have an AprilaireProgrammable thermostat attached to York furnace?Ac unit. The set point is usually around 22 degrees, and the room temperature is reading around 20 degrees. The furnace is not ...
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1answer
216 views

No C Wire Nest Thermostat

I just installed a nest thermostat. The previous thermostat did not have a C wire attached. It G, RC, (RH Jumper), Y and W. When I hooked up the nest thermostat it was short cycling the blower fan ...
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15 views

What is the proper replacement igniter for my York furnace?

I replaced one of these before on another unit but the part number was printed on the igniter. This one is not so, being ignorant to HVAC I just want to make sure I get the appropriate part. York ...
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2answers
59 views

How to figure out how to wire a 2 wire furnace to 3 wire thermostat

I have a 2 wire furnace and want to wire a 3 wire thermostat. My red wire is connected to the c in the transformer and the white is connected to the load. It works fine 2 wire but I dont want to mess ...
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64 views

Water is dripping from the furnace exaust flue

I replaced my hvac and noticed that my flue is dripping water. Wondering what might cause it? I assume some sort of condensation, but I don’t know what should I do to fix it.
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56 views

Wired “like” a dual transformer

I'm trying to update to a smart thermostat and my current one is wired like a dual transformer but I only have a single hvac system in the basement. Any idea why? My plan is to move the blackwire ...
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1answer
25 views

Furnace shutoff switch outlet only hot when furnace is running

I have an old Aprilaire 700 powered by the 110v outlet on the side of my furnace. I recently replaced the old humidistat with a newer Aprilaire 60 Digital. This humidistat comes with the blower ...
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72 views

Use a 2-wire line voltage thermostat on a 24v / low voltage 2-wire furnace

This is an ancient furnace at my aging mother's. Basic 24v thermostat, two wires only, the original from my childhood used a mercury switch. There are some commercial, line voltage, 2-wire thermostats ...
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42 views

Where to connect C wire on older furnace

Upgrading to a wifi thermostat and already have extra unused wire from furnace to wall, just not sure where to connect it at the furnace. I do have central air installed, and assume the blue wire ...
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2answers
51 views

Fan blower motor of Bryant furnace keeps running after flame is off

Fan blower motor keeps running in winder after the room temperature reaches the setting. Occasionally, especially in the case that the outside temperature is very low, the motor stops as expected. But ...
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60 views

Can I place a cap on my furnace exhaust to keep rainwater out?

I have a Lennox high efficiency furnace the vents out the roof with plastic piping, both fresh air and exhaust. The fresh air pipe terminates above the roof with a U-shaped pipe at the end of it, I ...
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25 views

Furnace Inducer Whirrs on and off before igniting, works when I tap circuit board

My furnace gets the signal from the thermostat, then about half of the time, the inducer motor whirrs on and off over and over. Sometimes it runs continuously without ever lighting. When I open it up,...
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40 views

Small part of filler in furnace is stuck. Can I still insert a new filter?

Bottom of furnace filter stuck can I still put new one in
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32 views

motor wire pinout

i have an older furnace and i need to change out the blower motor soon the original motor is getting bad. bushing bad. anyway i got another motor the same frame size but it came with 4 wires. white ...
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3answers
101 views

Furnace not turning on, and can anyone identify these sensors?

My home has a gas furnace with electronic ignition (intermittent pilot). Sometimes it doesn't want to start up, even with the thermostat turned up, and it indicating heat should be on. The fan-only ...
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53 views

How should I know if my humidifier work?

I have a Aprilaire 600 Humidifier installed in my basement, as per the manual it should automatically kick off when the lack of humidity is detected. It didn't seem happening. After I adjusted the ...
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42 views

Furnace Troubleshooting- Inconsistent Error Codes

My American Standard furnace ("Standard" Model, year 2003, 12 or 13 SEER) gave an Error Code 2 when first turned on- "External lockout, retries or recycles exceeded." (4 fail to ignite cycles ...

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