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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How do I wire an old furnace motor so I can use it as a garage exhaust fan?
Since last I posted, I moved WAY south (lil warm down here) and the house I moved into was a foreclosure so a few things needed done, namely the AC and furnace. When the guy did the job he said he ...
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2answers
134 views
Can I move my furnace room ventilation intake closer to my furnace?
I live in a 3 story townhouse with a garage in the basement. Off the side of the garage is our furnace room. The ventilation and exhaust for the furnace goes to the roof. For ventilation (air coming ...
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1answer
110 views
Is there a standard length on the PVC furnace pipes coming outside the exterior?
We have a high-efficiency furnace. Two pipes are coming outside the house as expected. However, right now, there is at least 2 feet or more of extra PVC on the exterior showing.
Is there any ...
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1answer
203 views
Will I see any performance gains if I reconfigure my thermostat to control the second stage of my 2 stage furnace?
Our furnace is a two stage one that was installed last year (a Bryant 80t). When it was installed, it was installed with a thermostat for a one stage furnace. This appears to be because this model ...
2
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1answer
6k views
Why does my pilot light keep going out?
My furnace pilot light keeps going out so I changed the thermalcoupler now the furnace will come on and heat up to the degree set on my thermostat, then the pilot goes out and the furnace will not ...
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1answer
923 views
What would cause a furnace to shut off prematurely?
I've got a Carrier Weathermaker 8000 furnace that shuts off about 90 seconds or so after ignition, started doing this recently. I get flashing code "33" which indicates:
The code indicates:
33 ...
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2answers
2k views
How can I tell what kind of heating system I have?
Seems like a simple question, but I've had a very hard time finding a definitive answer to this.
I went to the hardware store to buy a replacement for a faulty thermostat and when I arrived and ...
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2answers
859 views
Is it OK to turn off power to a fuel furnace?
Is it OK to turn off the power to a fuel furnace to replace the thermostat? Will the furnace start back up once power is restored? This is on a new furnace with an old thermostat and fuse panel.
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1answer
281 views
Are High End Furnace Filters worth the cost?
There are many levels of furnace filters. I can get cheap ones at walmart of a few bucks. Then there are ones that cost upwards of $30. I realize that if you have allergies or low immune systems, ...
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1answer
1k views
Why won't my Heil 7000 natural gas furnace ignite?
I have a Heil 7000 gas furnace
Model: NUGK100DH12
Serial: L933050100
When we turn it on at the thermostat, the exhaust blower will kick on. We checked to be sure the gas is reaching the unit and ...
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1answer
823 views
How do I fix a condensate drain line that froze in my split electric system with heat pump?
I have a split electric system with a heat pump. It looks like my condensate drain line is frozen. I switched to supplemental heat which does not use the heat pump. Is this enough for now? Our ...
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1answer
525 views
Why does my gravity vented wall Furnace keep turning off/
We have an Empire gravity vented wall furnace:
That turns off. According to the instructions, this is because the vent safety switch. But when I open up the furnace, it appears to be vented just ...
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1answer
31 views
Can a non-expandable filter be used in place of an EZ flex furnace filter?
My Carrier furnace has the EZ flex filters (16x25x5). These come with the plastic end caps that fit on the expandable filters. Can a regular filter, non expandable, of the same dimensions be used as ...
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0answers
93 views
Are w1 and w2 both energized during a second stage heat call from the thermostat?
Short version: does two-stage thermostat always close W1 circuit when it closes W2 circuit, or they might be closed independently?
Long version:
I have two-stage furnace, currently connected to older ...
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1answer
190 views
Furnace Draft Inducer Repair: is previously installed back plate necessary?
I'm replacing a non-functioning draft inducer on the Goodman furnace in my house (GMP075-3). The previous inducer was mounted with a sheet metal back plate between it and the wall of the furnace. ...
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0answers
184 views
Why won't my condenser turn on when I run my heat pump?
I have a York Affinity condenser. When I run my heat pump, I expect it to turn on somewhere in the cycle but it doesn't. It generally does this once a year. The usual fix is to cycle the power of the ...
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2answers
2k views
How do I build a firewall around my furnace/water heater?
I'm in the planning stage of finishing my basement. I'd like to section off the furnace and water heater, and am assuming that I should fireproof that section of the build.
What's the best way to go ...
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2answers
348 views
Is there a filter-reminder thermostat that uses run-time instead of total time?
My HVAC filter is in my crawlspace and is a hassle to change. I don't want to change it more than needed. "Change it every month" is bogus advice because in some months (like May) we don't have to run ...
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2answers
337 views
What could be wrong with my furnace?
The furnace started blowing cold air so I checked the furnace and the burners weren't lit only the pilot was on. This happened last year and repairman said that if it got too hot would trip a sensor ...
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1answer
192 views
How can I stop my house from waking my wife up every day in the winter?
I'd like to preface this post with the fact that I'm a complete diy amateur. I may say stupid things, or things that make no sense. Please feel free to correct me as I'm always open to learn.
So, ...
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2answers
146 views
How do I choose a furnace airfilter?
I have a furnace/air-conditioner that can support filters of various thicknesses: 1", 2", or 4". Filters are available in various MERV ratings. How should I decide which filter to use?
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2answers
99 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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1answer
182 views
Is it safe to put a gas furnace in the same room as an electric clothes dryer? [duplicate]
Possible Duplicate:
Can an electric dryer be next to the gas furnace?
We are currently remodeling our house. Is it safe to put a gas furnace in the same room with an electric clothes dryer? ...
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3answers
3k views
Why is my Lennox g40uh series furnace not turning on?
I have a Lennox g40uh series furnace and it just stopped working today. I can reset the furnace and can see that on the control board both LEDs (green and red) are blinking together which indicates ...
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1answer
51 views
What is a quieter alternative to gas forced air heating?
My small 1BR apartment has an old gas furnace that works great, but costs my landlord too much to insure. He plans to install gas forced air, an in-unit upright furnace. I'd love to suggest a ...
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2answers
52 views
How do I interpret my furnace clearance diagram?
My brother-in-law and I are going to be finishing my basement. We just got the permit from the building inspector. When they returned my plans there was a note that told me to make sure furnace and ...
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1answer
403 views
Why does my pilot light go out continuously?
My furnace pilot light keeps going out. The furnace will come on and heat up to the degree set on my thermostat, then the pilot goes out and the furnace will not come back on. Could the thermostat be ...
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1answer
123 views
Can I reduce the size of my hot water heater vent or direct the vent out the exterior (house has high efficiency furnace)?
The shower in my master bath is tiny. When I removed some dry wall to see if I could widen it, I found a large ~10" round vent running through the space(must be the furnace). Now that I have a high ...
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3answers
252 views
Are 5" thick filters for furnace/Central AC still available?
My furnace/AC was installed about three years ago. It uses 16" X 25" X 5" filters. The problem is when I try to find a replacement at my local home center: at Lowe's, Home Depot, (you name it), I ...
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1answer
272 views
Furnace Airflow
I have central air. When the furnace comes on, we can feel air coming out of the registers for a few minutes, then the airflow stops. If we turn it off for a few hours, we can turn it on again and get ...
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1answer
204 views
Massive reduction in air flow in furnance with air filters
After I put in a 3M filter into my furnace the air flow was massively reduced.
So, does that mean the filter is wrong or something is wrong with my furnace.
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1answer
322 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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2answers
392 views
furnace creating a ground?
our gas furnace has a junction box on the side of it for the 110 feed for the blower, the feed has no ground wire , if i put a meter on the hot wire and metal box i get 110/120 , without a ground wire ...
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1answer
5k views
How do I test a furnace limit switch?
When my thermostat reaches the desired temperature, the furnace fan shuts off briefly, then cycles on and off a few times. Several internet posts pointed me to the limit switch, which seems to make ...
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0answers
84 views
Why is my furnace blowing hot air outside?
So I have been having trouble heating my home. I noticed today that there is a vent blowing hot air outside. It is not the return, chimney or venting. Any ideas other that the builder thought we ...
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0answers
151 views
What's causing my draft inducer to stay on?
I have a new, 3-year old, high-efficiency, gas furnace in my home. I recently realized that my draft inducer, which normally kicks on before the burners and before the main blower, is not stopping.
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0answers
122 views
How can I clean out the pressure switch port at the inducer housing on a Lennox G40UH furnace?
I have a Lennox G40UH(x) furnace, but the gas does not ignite, because water may have entered the system while raining, or the the pressure switch port at the inducer housing has just to be cleaned.
...
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0answers
158 views
How do I know if my high limit and low limit are set correctly on my aquastat?
I have a boiler that is only providing heat for my forced hot water baseboard system (4 zones). I've always thought that the high limit on the aquastat was too low (the temperature on the boiler ...
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2answers
153 views
Oil-fired furnace sight window repair
I have an 20+ year old oil burner and a tankless boiler/furnace. There is a small round (2-3" diameter) window above the burner that lets you see the flame, I assume as an aid to tuning the burner.
...
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2answers
4k views
How can I test whether my furnace issue is the limit switch or the thermostat?
I suspected this issue during the winter and confirmed it now in the summer. Regardless of the temp in my home, the blower motor runs non-stop.
In the winter this must have been causing my home to got ...
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2answers
196 views
Furnace control board - interchangeable?
A few months ago, I had someone working on my outdoor a/c unit, and he accidentally shorted out the control board in the furnace (it's a Goodman gas furnace GKS91155DX). He replaced the board, and the ...
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1answer
87 views
What to look for in a new furnace
I've recently been told that my furnace, which is about 20 years old, is on it's last stretch and that I should consider replacing it now rather than waiting for it to fail - potentially at a very ...
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1answer
149 views
Why is my gas furnace blowing out cold air?
I had my heat set to 70°F all day and it was blowing out warm then out of nowhere, it started blowing out cold air for the past 3 hours. I tried turning off the furnace and turning it back on but ...
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0answers
65 views
How can I provide my furnace with outside combustion makeup air?
I cut a 6" opening in an insulated door into the utility room then installed a 6" metal duct with a plastic exterior vent cover. I put 6" insulated flexible duct on the interior stub and let it hang ...
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1answer
272 views
Why is my furnace running every 7 minutes, but not heating anything?
My furnace has been running every 7 minutes for the past couple days and there has been no heating coming from our baseboard heaters. all of our thermostats are on at about 60 - 65 degrees and it is ...
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0answers
12 views
trying to find an online retailer that sells peerless burner logs? [closed]
Had an HVAC technician come in today who told me i need need burner logs (aka burner tubes) - those things with holes in them that the flames shoot out of in your furnace.
Googling doesnt turn up ...
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0answers
163 views
Can I manually run the blower on my Lennox G12Q3 furnace?
I have a Lennox G12Q3-120-6 model furnace. Does anyone know if there's a way to manually run just the blower without heat?
There are no switches on the outside that I can see (other than the power ...
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0answers
217 views
new furnace installed - few questions
So, Sunday the fan on our 18 year old furnace died; instead of paying the $600 to get it repaired, i opted to buy a new one.
Lennox SPV98UV (i think) 98% efficient / variable speed fan. they ...
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1answer
61 views
why does my thermopump furnace keep throwing the circuit breaker [closed]
Lately the thermo pump breaking shot down and the furnace work on the auxilary . This is very expensive in electricity. But what can cause the breaker to keep throwing the circuit?
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1answer
344 views
why won't my furnace turn off once it reaches the desired temperature
I have a moncrief furnace and replaced the thermostat but the furnace will not cut off once it reaches the desired temperature. What could be wrong?
