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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Could my furnace be looking due condensation neutralizer?
I posted this and the main suspect was condensation pump but after troubleshooting, the pump is working fine (tested standalone). Now I wonder if the leak could be due condensation neutralizer if that ...
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2answers
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Chronic Flame Sensor Failure - Furnace and Water Heater
My house is 9 years old. About 5 years ago the Lennox gas furnace began to go into lockout. The problem was diagnosed as a dirty flame sensor. Shortly after, the same problem occurred with the Rheem ...
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82 views
Is my furnace leaking water?
I have water accumulated in my basement, that I squeezed out using towel. It was about 8 gallons of water in all. The only source I can see is the furnace whose surrounding is wet but I have never ...
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Possible to have more than one wire connected to “G” terminal in furnace?
I have a 25 year old gas furnace without A/C. I had a 2 wire basic thermostat that I have replaced the wiring with 5 wires and also a new Nest 3rd generation thermostat. On the wall beside the ...
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35 views
Thermostat wire does not go to Furnace
My thermostat wires go to a control panel heat pump system which go to the furnance , i need to wire a c wire but not sure how to go about this with the york control panel
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Furnace blower cutting in and out during A/C use
Backstory:
I fired up my air condition for the first time this season (single family house) and felt lukewarm air coming out of my ducts. When i went outside i saw that the condenser was not turning ...
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39 views
Fuel gas CSST line allowed in plenum in Texas?
I recently visited a house. The host pointed out something interesting.
The furnace AC combo is in an indoor closet and is vertical upflow and sits on top of a filter base that sits on top of the ...
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1answer
28 views
Goodman furnace - C Wire connection
I'm trying to connect the C wire in my Goodman furnace in order to install a new thermostat. I've read all the posts on this forum about this specific issue so my question is whether i'm in the right ...
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1answer
43 views
Furnace's contacts getting dirty
The two copper wires inside our furnace, that are supposed to ignite the gas, get too dirty to do the job about twice a year... We then have to go there -- always at inopportune times -- remove two ...
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26 views
Can the wire from the y terminal on thermostat be connected to the c terminal on heater board as pictures show?
My nest was installed with no c wire and it lost power. At this point the tech looked at the wiring diagram in a/c unit outside but I do not know what he did. A/c worked but later nest had no power. I ...
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2answers
51 views
Frozen drain line into septic from furnace
Last winter the condensation from our high efficiency furnace caused our line to freeze from the floor drain where the water was running into, all the way to the septic. No one was there to flush ...
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Lennox Furnace Blower not working on AC In On or Auto
Please Help!
I have a Lennox Furnace Model G60uhv(X)
after years of working fine I switched the thermostat to AC and it failed to start the cooling cycle. I suspect some sort of problem with the ...
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1answer
51 views
Line to AC dripping at the furnace
My line from my exterior AC unit is dripping at the furnace. The dripping over time has caused rusting and we've had to replace the control board under it. It appears the root cause of the problem ...
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1answer
46 views
Furnace Connect G Wire
I have a dual energy electric/oil furnace that is wired to a thermostat with 2 wires R and W. I don't have any AC. Inside the furnace there is a switch relay to control the fan but it is not connected ...
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2answers
66 views
I have an unused C wire hooked up to thermostat and have no idea where to connect it to the furnace for power
I know this question gets asked all the time but I've spent hours staring at forums as well as my furnace and at this point I'm desperate. I just bought a nest thermostat that needs a C wire ...
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1answer
44 views
HVAC blower fan won't stop
FINAL UPDATE: I have found the culprit - the Nest thermostat itself. First, I disconnected the t'stat at the control panel and found out that the fan would no longer start upon powering the system. ...
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1answer
45 views
Need to identify wires coming from external AC Unit
idiot DIY'er here :P. I recently installed a smart thermostat and long story short; I removed the two wires from my furnace's board for the external air conditioning unit in the process. I was going ...
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1answer
79 views
Exhaust Fan Runs With No Power at All!
How can my furnace exhaust fan run with the power off, the thermostat off, and the breaker off?!
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1answer
39 views
Furnace with no “C” connection
I have a mobile home furnace. This furnace only has a 4 wire connection terminal, G,W,R,Y. I also have a condensing unit outside with the 24 volt 2 wires coming to the furnace. I know I connect one to ...
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Furnace Pilot Flame ON constant but Main Burner never kicks in
I own an older furnace (Armstrong EG6F80DC12-6 -- natural gas, forced air, single stage, Honeywell S8600C Continuous Re-Try Module, VR8204A Gas Valve w/ Pilot Burner / Igniter-Sensor). It has been ...
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Lennox Furnace Troubleshoot Assist
I have a Lennox Elite G50UH-24A-070-15. It quit entirely and threw the error "Pressure Switch open or blocked" according to the diagnostics panel on the front. Recent renos so thought it was clogged/...
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1answer
32 views
Why is there a minimum distance to a corner from a direct vent exhaust?
According to the instructions for my direct vent furnace, (item #4) the minimum distance from the center of the vent to the nearest corner is 16 inches. Why is that important?
I understand the ...
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1answer
21 views
Furnace Pressure Switch Testing
I have a ComfortMaker combination furnace/AC for the back part of my house. The furnace kicks in, but never heats up. No errors are reported. Started troubleshooting and took a peek at the pressure ...
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22 views
positive pressure in a furnace room
I am planning to install an insulated exterior grade door on a finished furnace room in my basement. The room will have a hot air supply register but i read that I cannot put in a return because i ...
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1answer
51 views
What is the right way to extend a furnace intake pipe under a brick patio?
Our gas furnace intake (one of them, there are other intakes inside the house) currently comes out the side of the house but under a brick patio. It seems that the previous owner of the house extended ...
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Furnace heat satisfied but inducer starts and ingnition tries over and over
I have a Heil furnace 90 plus mfg 1989, Heat cycle is satisfied and thermostat is not calling for heat. Induced draft motor starts, spark igniter starts, blower starts and runs like this for 3-4 ...
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1answer
47 views
Trane XV80 furnace, two wire setup, wanting continuous fan when no heat is needed
I found the "Why doesn't the “fan on” mode work after I installed a new thermostat?" thread on this site and am wondering if the manual rewire steps would also work for a two wire system. The setup: ...
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2answers
55 views
No C terminal on furnace to connect a wifi thermostat
I have an new Emerson thermostat and would like to connect a c wire so it always has power. I have an extra wire that's not being used, but I don't have a C wire terminal on my furnace. I'm wondering ...
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2answers
39 views
Pilot light keeps going out
I have a Coleman mobile home furnace and my pilot light keeps going out. I have replaced the thermocouple twice, cleaned the orfice, replace the gas regulator with a brand new one, and even crawled ...
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10 views
I have a bryant air handler where the power to thermostat is lost
I have replaced thermostat with a new one, changed the circuit board out twice due to wasn't getting power to thermostat. when I power up after wiring in connections. fan comes on for a moment along ...
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1answer
41 views
Adding split AC to a Dayton oil fired forced hot air furnace
I'm trying to add split central air to my Dayton oil fired forced hot air furnace, mod # 3E268A. The manual clearly says it can accept this but the terminal block in the unit only has (4) lugs. TT and ...
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1answer
53 views
How to troubleshoot gas supply not making it to some appliances
I recently purchased a home and once utilities were turned on I've been having issues with certain gas appliances. Some appliances required a normal amount of time to get the gas flowing after being ...
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2answers
44 views
Using existing exhaust stack for new furnace
I'm about to replace the furnace in our house. The existing furnace uses a 6" stack through the roof. I know most new furnace installations just use PVC and poke out of the wall at about ground level. ...
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1answer
48 views
Unable to locate filter on Gas Furnace
Can not find where the filter for this furnace is. It is a gas Rheem Criterion II. Have watched YouTube videos but none look like mine. Thermostat keeps saying filter needs replacement.
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1answer
26 views
What's the right size pipe to buy for gas supply for this furnace?
I'm trying to figure out the right pipe to buy for a direct vent wall furnace. The instructions show 3/8 inch npt, and also say that the gas inlet is 1/2 inch. When I measure the gas inlet it appears ...
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2answers
63 views
Does anyone know what this type of furnace/heater is called?
I have this old style of heating but I cannot find any information on it. Can anyone help? It's gas and just sorta gets hot heating the house. No blower, no ducts, just the exhaust. The brand on the ...
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1answer
29 views
Furnace blower comes on full time when the thermostat is set to Auto
I have a Maytag furnace and the blower motor comes on right away when the thermostat is placed in auto and stays on when reaching the temperature set point and the heat goes off. I have replaced the ...
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Rheem 45,000 BTU gas furnace wiring- 1991 year
What are Rheem 45,000 BTU gas furnace wiring connections for the older hot surface control board? 1991 year model: rgde-04nhacr
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1answer
27 views
Trane Furnace Fan Works, But Heater Won't Run
As stated, my heat isn't coming on.
When this started:
Everything has been all fine and dandy all winter. The other day I ran the fan only for a few hours without the heat.
After this, my heat ...
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1answer
29 views
Furnace control board wiring - swapped on adaptor?
I am trying to replace my Goodman control panel (see this question), and have a wiring question.
The new control panel (50M56U-843) that I acquired came with a large variety of wire adaptors. I ...
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1answer
56 views
Dropped item in furnace duct
While trying to stop the ticking noise coning from my furnace ducts, I accidentally dropped a small piece of fire retardant foam (as you can see in the below photos) in one of the vertical furnace ...
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1answer
40 views
Aquatherm - thermostat is dead. What to check?
(Thermostat: White-Rodgers 1F80-51
Heating Unit is aquatherm, XUAQ22-2, this is a heat exchanger hanging off a hot water heater, and giving us forced air heat for a 500 sqft space. Unit and ...
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23 views
Why doesn't my Goodman furnace make heat sometimes?
I have a 2.5 ton 2 stage Goodman furnace. It's about 5 years old. Problem is sometimes when I start it I can hear the blower start up but no heat just cold air. This is a intermittent problem ...
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54 views
How do I stop the ticking noise coming from my furnace duct? [duplicate]
I've had some HVAC people here to look at the ticking noise coming from our furnace duct. One of them installed a brace on the piece in question. This seemed to make the ticking less frequent, ...
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4answers
209 views
Connect two thermostats in parallel
I saw a thread about connecting two thermostats in parallel.
I could not add comment to that thread , so I put question here again.
My tenants always shut off thermostat or reduce temp when they are ...
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1answer
222 views
Where to attach the c-wire inside Goodman GMP100-4 Furnace
As a relatively new home-owner, I recently came across the whole C-wire issue for the first time, having had to recently replace an old thermostat, and there is no C-wire connected inside the furnace.
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2answers
54 views
Goodman furnace not lighting
After a few power outages and some very cold weather, the Goodman (GMSS960803BNAA) propane furnace at our cabin is not heating.
The thermostat is new/replaced (Nest) and I've checked voltages for the ...
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1answer
85 views
need to connect a c wire to my furnace/air conditioner
I installed a nest with 5 wires, but the blue wire is not connected to anything on the 25-30 year old furnace. We tried connecting the blue wire to what we thought was a common terminal, but the ...
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170 views
Are black marks on the wall over a radiator cause for concern?
I'm looking to purchase a home that has a hot water system. This home shows black marks above the radiators on the painted walls. What does this mean and should I be concerned? The previous owner ...
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Why isn't my furnace igniting?
I noticed cold air from my Carrier 58SS furnace. The main burners were not lighting. The pilot flame was strong, but yellow.
When I tapped on the gas valve, the pilot shut off. I removed the pilot ...
