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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3answers
183 views
Should the fill line be removed when decommissioning an old oil tank?
So, I have a contractor decommissioning my old 650-gallon oil tank. There is a 3" metal tube coming out of the ground from the tank that is what I believe to be the receptacle used to fill the tank ...
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2answers
338 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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2answers
353 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 ...
3
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1answer
381 views
How can I prevent water from entering through water heater/furnace exhaust vent?
I have an exhaust vent in my basement (Amerivent Type B) which takes the exhaust from my gas furnace and water heater goes out the basement wall, and up my chimney. A little bit water is coming in to ...
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1answer
324 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
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 ...
3
votes
1answer
245 views
How well would a hydronic furnace work with a gas tankless water heater?
My current heating system (in Ontario) is an oil hot water tank in a closed loop with a hydronic forced-air furnace (Enerzone XAH 68). The water circulates through what is basically a heat exchanger ...
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4answers
845 views
Why do I have two parallel gas pipes?
I've got a water heater and a hot water radiator furnace sitting next to each other, both on gas. The strange thing is that there are two parallel gas lines feeding each one of these which come from ...
2
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1answer
111 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 ...
3
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2answers
1k views
How do I troubleshoot an electric furnace?
I have a Coleman 3300-9051 electric furnace w/AC. The blower continually runs.
Where do I find a repair manual and/or what could be the problem.
How do I test it.
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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? ...
4
votes
1answer
778 views
What would cause my furnace to only work with the filter removed?
My Carrier furnace works fine without the air filter in place on the return. With the filter in place it works for a while and then stops with a complaint about "limit, or flame rollout is open" ...
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2answers
314 views
Is there a way to find out how often your furnace is running?
With winter finally setting in, and being the first year in our new house I would like to put some sort of measurement on how often the furnace is working, before I get the bill. Are there any known ...
2
votes
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 ...
6
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2answers
382 views
Can an electric dryer be next to the gas furnace?
I intend to relocate my washing machine and electric dryer within the basement. The dryer will then be about 2 feet from the furnace. Is that OK?
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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 ...
3
votes
4answers
2k views
Can I connect an outdoor wood stove to my current HVAC system?
How to install a wood stove as an auxiliary heat source? (Main is electric furnace with forced air)
I've read this question, it doesn't really answer what I need to know. What I would like to do is ...
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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.
...
3
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2answers
3k views
Why won't my furnace turn off?
My furnace is running OK and heating the house. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. I can turn it off manually at the ...
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votes
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 ...
2
votes
1answer
2k views
Is my furnace operating normally?
I just moved into my house and I am wondering if this is normal for a furnace.
So I have my furnace set to 68 degrees. The temperature on the thermostat says 66 degrees. The furnace is on, but does ...
3
votes
2answers
810 views
Can I piggyback a thermostat with a C Wire hookup on a furnace?
I'm trying to install a new thermostat that needs a C wire hookup. There are currently 4 wires running from the thermostat to the furnace, none of them are a c wire. When I look at my furnace itself ...
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0answers
185 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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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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3answers
255 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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5answers
5k views
Where should my furnace filter go in a Lennox G40UHX series furnace?
I have a Lennox G40UH(X) series furnace, which is installed in our attic (We have a single-story house on a slab). Because the furnace is installed in the attic, it is "laying down" on its side, and ...
2
votes
2answers
874 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.
3
votes
2answers
3k views
Why does the gas furnace blow cold air at the start of the heating cycle?
What does this problem sound like?
There is a 25 year old gas furnace in the house we rent.
(The guy that owns the place claims there is NO problem at all. He said the igniter is brand new and ...
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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 ...
4
votes
1answer
158 views
Are discount furnaces safe to use?
More newbie questions ;-)
The house we're looking to buy has an older furnace that "may be manufactured by the Permier/Consolidated furnace company" according to general inspections. We're in the ...
3
votes
1answer
158 views
Where can I find resources on Gas Furnace manufacturers
We are going to replace a 30 year old residential gas furnace. We have estimates for furnaces from Rheem, Trane and Bryant. This is a rental, so we aren't going for the 95% with tax rebate but ...
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1answer
280 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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5answers
899 views
How do I prevent ice stalagmites from building up on the furnace exhaust?
I have a high efficiency furnace that exhausts via a pvc pipe out the side of the house, the trouble is the moisture from the exhaust forms an ice stalagmite in my driveway in the cold weather.
Are ...
3
votes
2answers
143 views
What to do about furnace that's drawing gas odors into the room instead of heat?
I have a gas furnace. It was heating up the place fine and worked for years until the other day.
All of a sudden it started drawing air that smelled like strong gas odors into the room rather than ...
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vote
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 ...
5
votes
1answer
344 views
Insulating ducts in a crawlspace
Consider a source duct from the furnace/AC. The ducts run in a vented crawlspace. The floors atop the crawlspace are a mix of hardwood and kitchen vinyl.
The symptoms are:
the longer run vents ...
2
votes
1answer
830 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 ...
2
votes
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 ...
4
votes
5answers
906 views
How often should the air filter in the furnace be changed?
Does the period of change of this air filter have an affect on the longevity of the heating and a/c system? What is a good rule of thumb to require replacement?
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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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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.
3
votes
3answers
1k views
Why would a furnace overheat with a standard density filter?
Some time ago I found my furnace (gas, forced air, downdraft) was getting stuck on, blowing cold air. I could reset it, but it would happen again after a while.
After calling out a service man, I ...
3
votes
3answers
12k views
Why is my furnace blowing cold air?
My HEIL 7000 natural gas furnace has stopped working what are the most likely causes, and how to verify faulty parts?
Normal operation routine
Thermostat sends "need heat" signal.
Exhaust blower ...
4
votes
3answers
7k views
Why do our baseboard heating pipes make a loud banging noise after a new furnace was installed?
We had a new furnace installed about a month ago. The heating in our house is hot water baseboards. Ever since the new furnace was installed, when the heat comes on or turns off, there is a loud ...
2
votes
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 ...
3
votes
5answers
4k views
Why does my furnace need frequent power resets?
I have a NOMA Programmable thermostat attached to my furnace.
The set point is usually around 21 degrees, and the room temperature is reading around 17 degrees. The furnace is not coming on.
...
2
votes
2answers
550 views
Does it matter where my furnace condensate pump gets power from?
The existing condensate pump for my furnace recently died. It was hard-wired directly into the electrical panel of the furnace but I was able to disconnect it. However, when looking for a new pump, ...
5
votes
3answers
790 views
Can I close the garage vent on my furnace?
My furnace duct system has a vent in the garage, right over the furnace. Is it necessary for the proper operation of the furnace to keep that open? I'd hate to waste the money heating up my garage, ...
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vote
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?
2
votes
1answer
283 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, ...
