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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Blower Fans Turn 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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2answers
22k views

Why is my furnace blower coming on so early in the ignition process?

Alright, I installed a new furnace a few months ago and have begun to notice an issue with the blowers. When the furnace first starts up, the exhaust blower should turn on to expel gas, then the ...
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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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1answer
84 views

burners out of sequence with blower motor

I have a Bryant furnace plus 90 model #398AAW036060D. I just changed the blower motor. In the last five years I've changed the main board, inducer board, pressure switch, and cleaned the igniter the ...
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1answer
55 views

Any pros and cons on relocating register on the ceiling?

I need to relocate a Heat/AC register (Labeled 2) I am planning to move it to new location (Labeled 3), kind of in the middle of the room on the ceiling. At the same time I think I need to move the ...
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1answer
78 views

I live in the Northeast area of the US, and my emergency heat on my furnace/ac is broken. Can I get thru the winter months without fixing it? [closed]

I live in the Northeast area of the US, and my emergency heat on my furnace/ac is broken. Can I get thru the winter months without fixing it?
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1answer
158 views

My blower fan won't turn on unless AC is running

So first of all, I've changed nothing: same thermostat and same everything. I typically run my blower fan 24/7, but a few days ago it stopped working unless the AC is on. Which tells me that the ...
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1answer
5k views

Thermostat won't always start heater on its own

I have a gas furnace that seems to work fine; it keeps the house warm when things are running as expected. Sometimes, however, we'll notice the house is getting cold. The temperature on the ...
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27 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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1answer
46 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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1answer
94 views

1999 Goodman furnace modeld GSMS060-3

Furnace goes through the normal start up process but after 5 minutes the flames go out and I hear a click in the induction motor not the main fan. What could I check. I have taken out the flame ...
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1answer
53 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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45 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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2answers
89 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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1answer
48 views

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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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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1answer
40 views

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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1answer
81 views

Fan comes on but the air conditioner does not

During hot days when the air conditioner is on a lot it comes to a point in the evening when the air conditioner shuts down and the fan (from furnace) stays on. This will go on all night as the house ...
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2k views

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
24 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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1answer
112 views

York furnace not firing up correctly

I have a York TG9S080B12MP11A up-flow configured natural gas furnace. We have had the furnace since 2007. I am having an issue where the furnace is not starting correctly. When I power up the blower ...
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1answer
54 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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2answers
162 views

Thermostat wiring for fan only

I have a White Rogers 1E78-144. My house has heating only and no AC. https://climate.emerson.com/documents/ie78-non-programmable-thermostat-instructions-en-us-4209010.pdf The current wiring only ...
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1answer
3k views

Blower motor turns on before furnace heats up all the way

I have a Honeywell furnace and when it starts the exhaust fan kicks on then the flame starts (it's a propane furnace) it warms up between 30 seconds to a minute then the main blower kicks on but it ...
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2answers
40 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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3answers
5k views

Why won't the heat shut off in one zone?

we have a three zone baseboard hotwater furnace. a few months ago one zone would randomly stay on, we did change the thermostat we have not noticed the problem again, but in another zone we have the ...
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1answer
37 views

Furnace Not Running After First Cycle

My Trane XB90 model TUC060C936BA natural gas furnace will run without any apparent problems for its first cycle after being off for a while (several hours/overnight). From my non-expert understanding, ...
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1answer
19 views

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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1answer
49 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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2answers
24 views

Fan in my furnace will not turn on in the manual position

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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2answers
4k views

Furnace keeps going out during cold periods, needs procedure to reset

I have had a reoccurring problem with my Rheem gas hot air furnace. Model# RGVC 07EA ER and SER #KN5D1041F47889671. This is a 28 year old furnace that is a horizontal attic mounted furnace. I have had ...
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1answer
109 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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1answer
10k views

Goodman gas furnace limit switch opening, blower only runs with a/c

I apologize in advance for some of my incorrect terminology. My father has a 2004 Goodman GMH80904BN gas furnace with a/c. The a/c has functioned properly all summer here in Ohio, we have recently had ...
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26 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
26 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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1answer
16 views

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
24 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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4answers
41k views

How do I wire a humidifier without a 24 VAC IN terminal?

The instructions for the humidifier I'm installing says to connect the humidistat wiring to the two terminals "marked 24 VAC IN". My furnace doesn't have terminals marked that. I have R,C,W,Y.G. Am ...
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1answer
26 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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1answer
21 views

Furnace won’t kick off once the desired temp is met

I had a Honeywell thermostat (older model), I replaced it with a new Honeywell basic model. Reason for replacing is because once I set the temp, and the temp was reached the furnace won’t kick off. ...
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2answers
112 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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1answer
66 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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1answer
36 views

Adjusting ECM motor air flow

I recently had the following Rheem ROCB furnance installed. https://www.rheem.com/product/ROCB-118P05-M It's paired with a Rheem 5 ton condenser for cooling. However, I feel the air flow is set way ...
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1answer
32 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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2answers
71 views

Venting a 96% furnace

I would like to use the existing exhaust ducting from a previous furnace to run the two pvc pipes for 96% furnace up through. I would cut the existing ducting in the attic to run the pvc out the roof. ...
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2answers
114 views

Should burners be removed when fixing an overheating furnace?

UPDATE - INDUCER MOTOR DIED! Apologies for the long post again but would appreciate anyone's thoughts on my current furnace developments...at a minimum it would make for a good troubleshooting ...
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0answers
16 views

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
1k views

No power in r line after changed thermostat

I have a carrier furnace 2008, just changed my old thermostat to new nest thermostat, forgot to turn off the power. Now I have no power on my r line, checked short fuse still good, red light in front ...
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1answer
277 views

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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1answer
297 views

Ecobee3 Setup and furnace only has W G R

My existing thermostat has 4 wires (missing C) so I'm attempting to use the Power Extender Kit (PEK) at the furnace control board. Only problem is, I only have 3 wires that are obviously labelled at ...

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