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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94 views

Groundwater cooled heat exchanger - forced air

I have kind of a crazy idea I have been scheming - I live in Alaska, and have a private well - the groundwater here is very cold(40-45F) or so. The last couple of summers have been miserable hot up ...
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Weak airflow after replacing furnace and add new A/C

I had Furnace HVAC before and I made a mistake not knowing what I had. We never had A/C. Recently I purchased this package from Costco: LENNOX ELITE SERIES AIR CONDITIONER SYSTEM XC13 LENNOX 80% 2-...
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50 views

Pilot light continually burning

The pilot light on my gas fire usually goes out once the fire is lit and I have released the switch. Now for some reason the pilot lite remains lit and doesn't go out until I turn the fire off. This ...
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37 views

Why does my furnace have a yellow termainal?

I don't have the manual for my furnace, and the terminals are labeled C W R G and Y. The internet generally refers to Y as Cooling or Compressor. So what does Y do on my furnace?
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54 views

replacing toggle switch on furnace red-green with thermostat

currently my furnace is connected to a two wire red-white thermostat. the furnace has comon, red, green, white, and yellow terminals. red and green are connected to a toggle switch on the side of the ...
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21 views

Leaky expansion tank overflow

I have a gas fired furnace with forced hot water. Off of the expansion tank there is a drain pipe. Recently it started leaking, roughly a mason jar a day. Why is this happening and can I solve the ...
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14 views

Variable vs Single or 2-Stage Furnace — Noise Issue

Will a much costlier variable speed be significantly quieter than a single or 2-stage furnace in a TV room where I'm adding a cold air return-- also adding central air to entire house.
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1answer
40 views

Why is my thermostat reading falsely high temperatures?

Thermostat is reading crazy high temps when it is really 67. Furnace won't deliver heat. Fan works. Is it the thermostat (batteries replaced already) or the furnace?
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30 views

Vibrating PVC exhaust pipe from high efficiency furnace

We have a two year old house that has this heating season developed a vibration in the exhaust pipe that can be heard on the first floor of the house. It seems to have decreased as the season has ...
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1answer
415 views

Why is Thermostat Y wire connected to C terminal on furnace?

I have a Nest E thermostat, and like many others have lost wifi and getting low battery because I have no common wire connected. After looking at my old Lennnox 78ugf3-75-1 furnace, I noticed that my ...
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1answer
119 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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29 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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65 views

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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31 views

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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43 views

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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1answer
47 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
132 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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52 views

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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53 views

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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1answer
34 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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1answer
48 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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25 views

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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43 views

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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86 views

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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36 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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1answer
31 views

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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2answers
52 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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1answer
339 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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1answer
55 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
43 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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16 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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23 views

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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3answers
610 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
421 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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28 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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95 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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35 views

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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2answers
87 views

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
27 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
38 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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1answer
87 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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28 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
335 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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1answer
17 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
98 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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90 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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61 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
49 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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106 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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