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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23 views

28V at furnace, 0V at previously working thermostat

This is a followup to an earlier question I posted where it appeared that the previously unused Common wire on my HVAC system was damaged. All of the other wires read 28V between them and R, and the ...
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1answer
53 views

Low voltage over C wire at thermostat

Similarly to this question of the same name, I am reading low voltage over the R,C wires at the thermostat. Unlike that question, however, the voltage is unusably low. I am only reading 2V over R,C ...
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Identify HW aquastat and add common wire to Honeywell aquastat

This has been asked before, but I can't find any info on my Honeywell aquastat. The model number, normally on the inside paper on inside of cover, is missing so I do not have any model number. There ...
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1answer
32 views

Can I put steam humidifier nozzle above the AC coils

I'm trying to understand how the AC coils drain the condensation. I have installed a steam humidifier and connected to the top plenum above the furnace and AC coils. My worries are if the steam will ...
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37 views

If I build walls surrounding sump pump, water heater, furnace, A/C, will it work stopping flood water from spreading to entire basement?

In the past, my basement was flooded twice. Both of which where lower than 8". I'm wondering if the following works to prevent future flooding of my basement or stop water from spreading to the ...
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78 views

What is this opening in the ceiling above my furnace, and can I plug it?

I recently installed a whole house fan in my attic. For those unfamiliar with whole house fans, they work by creating negative pressure in the living area and positive pressure in the attic. This ...
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71 views

How to determine the right MERV rating for Carrier furnace?

I have a Carrier 59SC2B. My research so far suggests that I need to measure the air pressure with a manometer at the return and supply side and add them up. Then use the table supplied with the ...
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1answer
39 views

How do I wire a furnace fan that has an electronic control module to run at full speed?

It is very useful to have an old furnace blower hanging around. Attach a plug a move lots of air. (Don't do this at home because it's much to useful and fun). The motor is a GE ECM Motors Model ...
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84 views

Attic HVAC BTU considerations

I live in central New York and will be installing a furnace and coil in my unfinished attic with an A/C unit outside to condition 800 sq/ft of upstairs living space. The attic a standard overhang (no ...
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57 views

Blower fan comes on once a week

I have basic two wire thermostat, one for power on for neutral. I only have central heat, not air. My blower fan kicked on the last two sundays, but itself, but not today which is sunday. It only ...
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81 views

Black sticky goo coming from furnace

Can anyone tell me what this is coming out of the furnace....
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2answers
139 views

Is there a reason to replace 50 year old metal ducting in the crawlspace with modern insulated flexible ducting?

My concern is heat loss in the chilly crawlspace. No AC here, only forced air gas furnace. The existing metal ducting in the crawl space is over 50 years but is intact. There is a very thin layer of ...
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51 views

Installing c wire in older furnace

I just installed a nest thermostat and need to hookup the c wire inside the furnace. I read where you need to connect the c wire to the secondary wire on the 24v side of the transformer. There are 2 ...
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3answers
52 views

Gas fired Forced-air furnace has a outlet grill in the mechanical room - can I remove it?

I just moved into a house with a gas fired forced-air furnace. Whenever I'm in the basement and the furnace is running I can hear a whistling noise coming from the mechanical room. I traced this sound ...
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58 views

For a smart thermostat, where do I attach the C wire to my furnace?

I know I've seen several questions out there about getting a C wire for a smart thermostat, however after all the research I've done and people who have given me guidance so far I have still had no ...
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4answers
134 views

Practical ways to reduce rattling noise in furnace?

Our bedroom is right above where the furnace is in our rented apartment. The furnace below makes a lot of noise, especially a rattling noise. Landlord is refusing to take any actions on it saying it ...
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93 views

Hooking up AC compressor to an old Lennox furnace

I'm trying to connect an ac compressor to an old Lennox G12Q3-110-3 furnace. Tried it a couple of ways and can either get the compressor to turn on or the furnace fan. Not both. Any ideas on how to ...
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22 views

Attic Fan for Carrier 58STX110--14122

I have a Carrier furnace in my attic (Model 58STX110--14122). Does this unit include an attic fan? There is a fan that used to turn on during the day when it's hot and turns off when temperatures ...
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56 views

I need a C wire connection for my new Glas thermostat

I have 3 wires(red,white,and green) going to my thermostat. I’m replacing my old thermostat with a new one the requires a C wire connection. The 3 wires goes to my Honeywell aquastat. The white goes ...
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2k views

What is this electrical fixture above a natural gas fired forced air furnace?

While visiting my mother-in-law, we wanted to get the smoke detector situation in her house up to par (this is in Massachusetts, we're from Europe, though). She has a natural gas fired forced air ...
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1answer
133 views

Help needed on thermostat wiring with Ecobee and Fast-Stat 5000

I'm trying to replace existing Honeywell controller for my furnace with Ecobee 3. The Honeywell controller does not use a C wire, however there are a black wire and blue wire in the wall behind the ...
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26 views

Flame sensor keeps getting dirty?

My father replaced his furnace about a year and half ago. His flame sensor every 2 weeks to month stops igniting and he will have to take it out to clean it. He's brought in furnace guys numerous ...
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117 views

Can I swap my natural gas water heater for an electric model in my hydronic system?

I'm in the market for a new water heater and had some questions. Current unit is an 50g Envirosense Power Direct Vent heater (Model No. 6G50100N full specs). The water heater is part of a hydronic ...
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16 views

Lennox gas forced air furnace intermittently fails to light burners yet continues to run blowing cold air

Lennox ML196UH070XP25B-05 about 8 years old with an intermittent ignition problem. Furnace will start and run properly 98% of the time. Unfortunately every once in a while (2 known times in 3 months) ...
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2answers
34 views

Lennox gas furnace maintenance

I bought brand new Lennox HE natural gas furnace 3 years back. It has been running perfectly. My dealer recommends to do a preventive maintenance because of 3 years time span. I regularly change the ...
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54 views

Is 20' of 2" PVC with 2 45 degree elbows too restrictive for a 92% furnace?

I have a Goodman furnace, 92% efficient, GKS91155DXAF. The exhaust vent flue was previously 2 inch PVC with one 45 degree elbow about 6 feet long overall, and it was routed directly into a piece of 6&...
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73 views

Upsizing Gas Line From Tee

I need to upsize a short 1/2" run to 3/4" (it splits from the main line using a tee). This is about 4-5ft long and goes into an appliance directly. Would it be OK to remove just the pipe and ...
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1answer
56 views

Trying to add a 'C' wire to my thermostat

I recently got a smart thermostat that requires a 'C' wire. My existing thermostat had only W1, W2, R, G. After removing the faceplate, I noticed there was what looked to be an unused yellow wire in ...
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1answer
186 views

Enclosing utility room (furnace / water heater) basement

I have a very old furnace (HVAC) in a utility room (basement) with slatted door that’s very loud and was wondering if I could enclose the utility room (with mineral wool and solid doors) by adding ...
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2answers
60 views

Furnace burner going out

I have a dual stage furnace. most of the time it works fine but 1 or 2 times a day it calls for heat, inducer motor starts, it lights up and the blower starts, after the blower being on 10 seconds the ...
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3answers
584 views

Where is the filter for my furnace located?

In an addition in my house before I moved in, a second furnace was installed way up on crawl space. The furnace is a Carrier Weathermaker 9200 and it was installed sideways (really 90 degrees ...
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63 views

What wires do I need to connect to get Aprilaire 600 working?

I just replaced an old Aprilaire with a new 600 model. I wired up all the previous wires to the corresponding spots on the new controller, but there are still open spots and when I turned power back ...
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2answers
89 views

Would an electric furnace prevent outside air from coming inside my house?

I have an old oil furnace that is vented to a chimney flue, with a damper. I live in Maryland in a county where burning yard waste is legal. This can cause me to have an asthma attack when my furnace ...
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68 views

C Wire - Williamson Furnace/Honeywell Thermostat

I'm trying to install a new wifi thermostat, but am a little confused. I have 5 wires, but none are connected to the C in the thermostat, as seen below: Additionally, when I trace the thermostat to ...
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157 views

Connecting fresh-air damper to Lennox furnace OR replacing timer with new smart thermostat

We replaced a 20-year-old furnace with a new Lennox furnace and added air conditioning. The new system is still controlled by the 20-year-old Honeywell Chronotherm III thermostat. The furnace had (and ...
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11 views

Adding central cooling to home with oil furnace but with basement height limitations and basement functionality concerns

My house is 20x30 and 1.5 stories (6' concrete basement). The basement height is just functional at 6' and I'd like to minimize obstructions (e.g. sprawling supply ducts). I'm planning to switch from ...
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37 views

Furnace pilot light goes out after burner shuts off

I have a problem with the pilot light on my furnace going out after the furnace has cycled and reached the temp set on thermostat. The problem started a couple of years ago but would only go out maybe ...
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1answer
44 views

heat is not responding to thermostat set temp but comes on when turned off and back on with the thermostat switch

At times during the day my gas burner doesn't try to come back up to the set temperature on the upstairs or downstairs main thermostat. I'll hit the up button a couple of degrees but no change. Then ...
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2answers
39 views

24vac transformer inside furnace

I'm adding a humidifier to my furnace. The included 24vac transformer fits nicely on the inner electrical box in the upper furnace compartment. I like that it keeps everything behind the external ...
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1answer
69 views

How to estimate the right size furnace for my house

I estimated the BTU for a new furnace for my house to be around 62,000 BTU. My Trane XR 90 furnace is 80,000 BTU. The square footage of my house is 1040 sq ft. Is a furnace over 18,000 BTU overkill ...
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127 views

Furnace turns off before temperature is reached, fixed by unplugging and replugging thermostat

As the title suggests, my furnace will sometimes shut off as if it's reached the target temperature, while it is still far below (ex. set to 70F, stops at 63). If I unplug the thermostat, the furnace ...
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1answer
28 views

Why does my furnace need power resets all the time?

I just installed a smart LUX thermostat and I know it's right but even with my old thermostat it was doing the same thing. My temp will be set at 70 yet its 62 in my house. I have to go to the ...
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41 views

Furnace setup switches seem to be in the wrong position

My furnace (Bryant 926TA) has to arrays of setup switches. I am particularly concerned with SW1-3 (off in my picture) and SW1-4 (on in my picture). The manual calls SW1-3 Low Heat Rise Adjustment and ...
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16 views

Inducer blower try to starts but immediately stops

I've got a Armstrong Air LP gas furnace with a Honeywell SV9520H 8034 and ST9160 blower control board and the inducer motor tries to start but immediately stop. I've can hook up power to the inducer ...
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1answer
81 views

C-Wire Williamson gsa-125-n-ip

Looking to install a C-wire for my power stealing nest. I have 5 wires up at the thermostat and same at the boiler. I am using red and white at the thermostat however it looks like blue and white it’s ...
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88 views

Does my home's gas pressure need to be checked?

Alright, my main question revolves around not understanding natural gas. Before we shell out a high dollar amount to replace our furnace and pipes and upgrade to Central heating & air, we want to ...
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2answers
50 views

Air pushing under basement door and kitchen sink cabinets when furnace runs

Whenever the furnace runs I feel a steady draft of air pushing out from under the basement door and kitchen sink cabinets. I have a mostly finished basement with registers but not return vents in ...
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1answer
66 views

Run humidifier while furnace is not heating but fan is running?

I've got a bypass humidifier mounted on my gas furnace, and an ecobee 3 thermostat driving both furnace and humidifier. What I like about having the ecobee drive the humidifier, is that it knows the ...
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1answer
109 views

High pitched whine from either the furnace blower fan or motor

There is a loud whine or scraping sound especially when the 11 year old Furnace Blower Motor/fan starts up. With power off, when I turn the blower motor fan blades by hand they make a scraping high ...
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24 views

Reline chimney or "chimney kit" on furnace exhaust

I had my brick chimney inspected, and the inspector found that the cracked clay tiles in the two flues (one for a gas fireplace, one for the furnace and gas water heater) need to be replaced. He ...

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