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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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Why is my thermostat turning the heat on too soon?

I have recently come across an issue with my thermostat and when and how my heat comes on. My thermostat seems to be an old round Honeywell. I set my temp at 65 typically. As of last night my ...
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Is it bad to close furnace dampers in order to balance temperatures seasonally?

I have a two story home. As such, it's always hotter on the second floor than the first floor. As advised by many articles and how-to videos out there, I usually close the dampers in the ducts ...
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Whole house humidifier when furnace is in unconditioned space

I have 2 furnaces, one in the garage and one in the attic. These are both spaces with unconditioned air, so they get very cold in the winter. The contractor who helped me configure my garage furnace ...
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Run two switchable heat sources from 1 Nest Thermostat

I have a forced air furnace/AC running off a Nest thermostat. It is currently working properly. I also have a hot water heat exchanger plumbed into the ductwork which runs off a coal boiler. I want to ...
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Carrier Weathermaker 8000: in heat mode, no flame and fan only turns on in fan on mode and not auto mode

model #: 58DLX090 ---- 10114 series: 100 My furnace worked until a couple days ago. Last night when I turned to heat mode and increased the temperature, nothing happened. So I took off the furnace ...
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33 views

Pilot light won't stay on after ignited

I have a gas furnace that is malfunctioning. This unit does not have a pilot position on the regulator. Just On & Off. When the thermostat sends its signal to the furnace, I hear the igniter ...
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38 views

Electric furnace doesn't perform a cool down stage

When my electric furnace shuts down the fan also shuts down at the exact same time. I was told that it should run for a bit afterward to cool off the coils. Doing some research it looks like this is ...
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1answer
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Furnace getting power, but heat/AC not kicking on. LED on board is not lighting up. Thinking the transformer is gone

So far I've been successful in maintaining and repairing my own HVAC system in my house. First week we bought the house (we knew going into the purchase) I replaced the main board. It's been golden ...
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1answer
41 views

Furnace won’t stay running and when the blower motor runs it sounds like it is sucking up water

Part red arrow is pointing to keeps filling up with water and when the motor/fan (blue arrow) runs it sounds like it sucks up water and then furnace stops heating.
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Condensing furnace short cycling

I have a strange problem. I have an IPC/Tempstar T9MPD075F12A3 condensing furnace, roughly 12 years old. It uses a Honeywell SV9541M "SMART VALVE". EDIT: Just found the service manual, checking ...
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fan on empire direct vent wall furnace hits the motor what can I do? [closed]

my fan on my direct vent wall heater hits the motor, what should I do?
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1answer
34 views

Connect C wire to Furnace

I have a Lenox Merit system in the house. I am trying to install Nest E thermostats and want to do it with a C wire. I noticed an unused Blue Wire (pic attached) at the thermostat location and then in ...
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Furnace not igniting with error E228

My furnace is Armstrong Air, A97USMV, today when turn on, the induce fan keep running but not ignition, then stopped with error code E228 (Unable to perform successful pressure switch calibration). ...
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47 views

How can I extend the length of my furnace run time after burner shutdown?

My new furnace has a control board with preset blower run times after thermostat satisfies. Max setting is 180 seconds. This is not enough to purge the latent heat in the heat exchanger. I need ...
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1answer
16 views

Electric Furnace, no AC, blower motor starts then slows after 1 second

I have an electric furnace 240V. The blower motor starts then slows and sounds like it is laboring after about one second. It does start at full speed, however. Does the same thing when in constant on ...
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How can I fix this furnace filter slot to prevent filters bending?

I noticed a problem with my furnace filter. In the vertical slot where it gets installed, there is a channel along the bottom but not along the top. As a result, the top corner of the filter ...
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Old oil furnace not getting enough power

Replaced the limit control thinking it was that, hooked everything up correctly and I still get nothing, no noise whatsoever, tested the limit control and theres no power going to it and also tested ...
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1answer
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Payne gas furnace, model # PY3GNAA36090AATP.

Indoor fan blows continually, with 4 flashes on control board
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Can a pilot on a furnace be on but the thermocouple still be bad?

Heat just stopped working after working 3 days ago. All circuit breakers are looking good, gas is flowing, and furnace seems to be operating fine. Pilot is on and thermocouple is holding the flame, ...
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1answer
53 views

How long should electric furnace element last

I've been having elements go out in my electric furnace every year. Along with that, there's generally a burnt wire or two. Every about 2-3 years a sequencer goes out. Is this normal? I've been using ...
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1answer
39 views

Wall furnace burner not starting

My wall heater is not functioning. I had a similar post last year, and this year the problem evolved. Attached is the kind of wall furnace that I have. https://drive.google.com/open?id=...
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How should I connect AprilAir 600M humidifier to Goodman AMV9/ACV9_XA furnace?

How should I connect AprilAir 600M humidifier with Goodman AMV9/ACV9_XA furnace, so it turns on the call for heat only? I do understand that it is possible that if some portion of the fan fails and ...
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1answer
28 views

What type of replacement door?

Our home is on a slab foundation, our furnace and hot water tank are in a closet. Currently we have vented steel bi-folding doors, I'm looking to replace the doors. Do they need to be steel and vented?...
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How to Run Fan Only with Thermostar Furnace With G Wire

I have a Thermostar Furnace that works great for Heating our home. We do not have AC and do not want that. But, we do want to be able to just run the fan without heat. The W and RH wires were ...
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1answer
35 views

Placement of evaporator unit on top of furnace (residential)

I am installing an updraft 3 ton system with the evaporator on top of the furnace. They fit nicely, but I'm not sure which front-or-back orientation the top unit should be in. In the attached ...
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1answer
58 views

How should the thermostat wires be connected to my furnace?

I have an Amana AMV90704CXBB furnace, and regular programmable thermostat. I took the furnace apart because I have to wash the blower motor wheel. It was covered in construction dust. In order to ...
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33 views

Where should I connect my C wire on Goodman GMP075-3 Rev.B

I am trying to install an ecobee4 to replace a digital battery powered thermostat. I removed the existing thermostat and found that there was a spare blue wire that was wrapped around the others that ...
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124 views

error code for limit switch open

I am getting a error code for open limit switch. The exhaust fan will turn on,burners turn on for a short time then kick off. the big fan never kicks on. I checked for continuity on the limit switch ...
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Why does my furnace attempt to reignite at the end of each cycle?

Hi my furnace starts up fine, shuts down when the correct temperature is reached. The blower correctly continues, but then tries to re ignite several ties during the end of the cycle. This morning ...
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2answers
130 views

Is the ventilation in my utility closet a construction mistake?

With colder weather here in Northern Colorado (down to 22° F) my Goodman 90% efficiency furnace (GKS90453BX) came on for the first time in the (ca. 2005) home that I recently moved into. The furnace ...
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Furnace blower not operating correctly after replacement.

My furnace, a Carrier furnace 58sta090-12114, stopped blowing air, no heat or a/c. It would blow for a few minutes and stop. The blower motor felt hot, so I kind of just figured it was overheating ...
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Do I need to replace the thermostat wiring leading to my boiler?

I have a boiler in an old building with four different apartments. There are two thermostats that call for heat from the boiler, and valves that direct the hot water to the respective part of the ...
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Furnace humming

I turned on my furnace, waited 1 minute and nothing, turned on the fan and the outside unit turned on I'm getting 120V in and out on the two 60A breakers at the furnace, I'm also reading 244 on the ...
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1answer
112 views

Pilot Light keeps going out when thermostat is kicking on furnace

So I have had furnace man come out 4 times, plus the Gas company. Here is what has been done: - New thermocoupler - Two new gas valves - New Orface and line blown out - Gas company changed gas valve ...
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Wire Furnace Fan to Control Board to use fan only at thermostat

I am attempting to wire my furnace so I can turn the fan on. There is not a 18/5 wire ran from the thermostat to the furnace yet. But looking at the furnace control board, there is not a wire going to ...
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1answer
28 views

rewiring a furnace for an inside fan

I have a Outdoor AC unit that has an A-coil in it, so it pushes all of the air from outside through huge duct work and into the ventilation, which by the time it gets to the last room its extremely ...
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Bypass humidifier and forced air - no results

I have bypass Honeywell HE100 installed on a return side with 6 inch duct coming from the supply. Without the heat (fan only), I see that air that leaves supply is 90% humid. When the heat is on it ...
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Lennox furnace 3 flashing lights

Have a new construction house, and lived here about 2.5 yrs. Turned on my furnace last night worked fine. This morning, it kept turning on then kicking off with no burners coming on. I noticed the ...
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No pressure on half of furnace vents

The house has an addition and it the whole original house that has no pressure. The original.is a two story but even the vents on either side of the transition have different pressure. There's two run ...
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smartzone or Furnace: c-wire to smart Thermostat

I'm about to add the c-wire to smart Thermostats. However, I'm not sure where to connect it as I have the following options: I have two zones, ( and I have two smart Thermostat) , I can connect the c-...
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Furnace draft inducer switch tripping

I have an older furnace and a brand new natural gas instant water heater that I installed. I only start this way because the furnace had one thing break last year, so I'm not sure if things on it are ...
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Home A/C and heat furnace

My unit heats up to the desired temperature and keeps running only to start blowing out cold air without shutting off for hours.
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2answers
93 views

Where do I connect a C wire in an old Furnace?

I am hoping to be able to upgrade to a smart thermostat but unfortunately my furnace doesn't have the "easy" option with an obvious C terminal. My furnace is OLD but it actually has the full 5 ...
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1answer
39 views

Connect Wifi Thermostat to Goodman GMP050-3?

I'm trying to connect up a wifi thermostat to Goodman furnace, specifically the GMP050-3. I've done some reading on this but I'm still not quite sure how to go about it. Specifically, I'm not sure ...
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1answer
70 views

Hot water heater T&P discharge going into furnace condensate pump?

I recently had some electrical work done at my house, and as part of that, the power was shut off. After a few minutes, we noticed water coming from the closet containing the hot water heater and ...
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Proper way to seal attic space from the living space

I am living in a one-story house with flat roof. There is an 2-feet-high empty space above the ceiling and below the roof, and let me call it my attic space (although my house has a flat roof). The ...
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Are air vents in a house intended to let some air through when they're closed? Would it be bad to completely seal it?

I would like to be able to use the vents in my house in a way that targets specific rooms/areas more than others. Sometimes I want to completely close off a room from being temperature-regulated by ...
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How to Sync Booster Fan with Furnace Fan

I own an old house. Some of the rooms in the house that are too far away from the furnace are not getting enough air, the airflow is too weak. I tried to close as many of the other ones as possible, ...
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123 views

Can I use this piece (see pic) as a replacement?

Hi Guys, I am on my last connection in my new mother board replacement for my Carrier furnace. As I was trying to connect the wire in the top picture to the terminal it wouldn’t fit and the ...
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Replacing a motherboard on a Carrier 8000VS Furnace

Hi guys, I am trying to finalize the wiring of my new carrier motherboard. I have about four more wires to connect and the new motherboard is slightly different than the old one. The pictures I’ve ...