Tagged Questions
3
votes
2answers
354 views
Why does the pilot light go out when the furnace is running?
Every time the furnace fires up, it blows out the pilot light. Sometimes it will run a full cycle and blow out when it shuts down, and sometimes it will blow out about a minute into the cycle.
We ...
1
vote
2answers
366 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 ...
2
votes
1answer
137 views
Will an electronic air filter harm my furnace?
If I install a furnace-mounted, electronic air filter, like this one,
will it harm my furnace due to reduced air flow? How will I know if it reduces air flow too much?
3
votes
3answers
1k views
Can I sense filter replacement need based on filter pressure drop?
I should first point out that the system I'm referring to will be a self build DIY project. Fan and Filters being the only items purchased complete, And I'm still in the design phase but I'm not a ...
4
votes
1answer
797 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" ...
3
votes
2answers
305 views
Why is my furnace filter alarmingly clean?
I have central air and heat at my appartment I moved into about 6 months ago. Today I decided it was probably long past time to figure out how to change filters in the furnace so I poke around until I ...
1
vote
3answers
273 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 ...
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 ...
1
vote
2answers
147 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?
7
votes
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 ...
