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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37 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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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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45 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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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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95 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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25 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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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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32 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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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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66 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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48 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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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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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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583 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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59 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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87 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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58 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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86 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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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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34 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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36 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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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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61 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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87 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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26 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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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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15 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
62 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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2answers
74 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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47 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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57 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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90 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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19 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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Intermittent pilot light furnace giving up before igniting pilot light (Lennox G20 WhisperHeat)

Background: I have a Lennox G20 WhisperHeat furnace (on natural gas) with an intermittent pilot light. The unit is around 25 years old, and has functioned flawlessly until recently. The problem: ...
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54 views

Blower turns 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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26 views

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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139 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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3answers
134 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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55 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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63 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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26 views

Fan in my furnace will not turn on in the manual position [closed]

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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68 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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136 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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27 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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31 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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17 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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60 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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57 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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77 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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