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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Hot surface ignitor does not glow occasionally

Can one of you experts please help with this unusual issue? The hot surface ignitor does not go on occasionally. So far, I had this issue 3 time in the past week. My furnace: York gas furnace with ...
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192 views

Ecobee3 Setup and furnace only has W G R

My existing thermostat has 4 wires (missing C) so I'm attempting to use the Power Extender Kit (PEK) at the furnace control board. Only problem is, I only have 3 wires that are obviously labelled at ...
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Rapid on/off cycling of furnace

My 50-year old wall furnace keeps cycling on and off as it gets near the set temperature. Can I fix this by changing to a new thermostat? It's a 2-conductor cable (no blower).
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Furnace motor not kicking on

I have a goodman furnace who's fan motor will keep running. it's like it is trying to kick on, but it can't will run fast then slow down then fast again. the only way it will kick on is to turn ...
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1k views

Blower motor turns on before furnace heats up all the way

I have a Honeywell furnace and when it starts the exhaust fan kicks on then the flame starts (it's a propane furnace) it warms up between 30 seconds to a minute then the main blower kicks on but it ...
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Goodman gas furnace won't light

I am trying to resurrect a Goodman gas furnace that hasn't run in a few years. I have gas to the unit, but no ignition. Vent blower starts up initially, but soon goes to intermittent operation, I ...
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140 views

how to deal with oversized furnace

I recently got a new furnace for our 1200 sqft house in Denver CO. We are planning on adding a second story in a year and I was going to wait until we did that to replace the furnace. Then the furnace ...
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167 views

Inside HVAC furnace, zero ohm between R wire and W wire, is that normal?

I have a Lennox system (G27M series). The transformer has a 3amp breaker. It trips time when the R wire and W wire are connected (heat is on). To find out where the circuit is short, I attempted to ...
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936 views

Furnace keeps cycling on and off until it's up to set Temp

I have a Philco 80,000 btu two stage with variable speed blower, high efficiency furnace with a two wire thermostat, on/off. The furnace 6.5 years old and when the thermostat calls for heat the ...
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1answer
63 views

Why is a furnace blower not running?

On a brand new oil furnace the burner works fine but the what seems to be a 2speed blower will not start. The limit switch shuts the furnace down after heat rises. It resets after it cools down. ...
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263 views

Furnace sometimes fails to ignite, despite extensive replacement of parts

I posted a questions months ago, that it randomly decides to not start. Random as in work for a few hours, a few days, a few weeks....whenever it feels like not working, random. I went and replaced ...
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4k views

Wiring Humidifier using W and C Terminals vs using Humidifier Terminals

I found info at this thread, and would have placed this question there, but I can't comment since I'm too new. I have HUM terminals on my control board, but they're line voltage (120VAC). I don't ...
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1k views

Furnace ignition intermittent?

Well, here is another question related to my OLD carrier furnace. Again, it is a 58DXA060-101GG (or 100GG.) The issue is that during the day it seems to do pretty ok as far is starting a heating cycle....
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86 views

Blown Refrigerator & Furnace fuse?

I live in the Midwest. My home was built in the early 70s. I recently blew the fuse in my living room (SL 15 amp I believe), but I was able to buy a new fuse and replace it. However, now the furnace ...
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23 views

Hot air gas furnace

My hot air gas furnace comes on and cycles through. But sometimes the gas lights the burners and then they go out after 10 seconds and the blower is just blowing room temp air. The furnace is only 1 ...
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Why does my non-vented gas fireplace turn off after a few minutes?

I have a non vented gas fireplace, brand new, it has a screen on the front and logs. The pilot light is strong and stays lit, however the main flames turn off after a few minutes even when the ...
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1k views

Old oil furnace with 2 wire thermostat, installing new wifi and need C wire. How can I wire with my current stack switch?

I'm trying to wire a new wifi thermostat and only have two wires, R and W. The stack switch (transformer - pictured) only has two wire slots as well. What is the easiest way to add a common C wire? ...
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39 views

gas furnace pilot

my gas furnace pilot goes out randomly. I have replaced the thermocouple, added a "drip'' pipe at the incoming line to eliminate any particles blocking the gas orifice, replaced the main gas valve, ...
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61 views

Why Does My Heil Furnace Start When It Should Be Off?

My Heil furnace starts with the thermostat set to off. I disconnected the thermostat wires at the thermostat and it still starts randomly. I disconnected the heating wire at the board and it still ...
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192 views

tempstar furnace the inducer motor runs all the time

my inducer motor runs all the time. what can be wrong I have replaced the thermostat and the controll board and it still does it.
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1answer
188 views

Oil furnace fan won't shut off when “heat” plug is connected to control board

I was changing my thermostat and I attempted to make the swap live without turning power off. When I connected new thermostat, the fan kept running. Ruled out bad thermostat and wire short by ...
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975 views

What makes a furnace pilot valve whistle?

I have a furnace that started whistling, recently. I have read that gas pressure changes can cause this. Others have remarked how seasonal gas changes can lead to a properly-adjusted furnace to ...
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150 views

Is this electric furnace likely to be insulated with asbestos?

I inherited this electric furnace and I'd like to identify the material it's made from. I've not managed to find any record online, but the company itself no longer exists. Given its vintage (90s at ...
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769 views

Furnace blower intermittently stops working

The blower on my furnace is set to be on constantly. The last two nights in a row I have woken up in the middle of the night to hear that the blower is not running and that the temperature is dropping ...
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90 views

With registers fully open I have unbalanced air flow upstairs vs downstairs

Upstairs the airflow is OK Downstairs I have 4 registers. Three out of four have very weak air flow while the fourth one is blowing like hell Is the problem in the furnace or in the air ducts?
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456 views

Asbestos in my furnace closet - should I get rid of it?

I have a home built in 1958 with a closet inside the house that contains the furnace. When the house was constructed this closet was lined with asbestos as a safety measure. How dangerous is it for my ...
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231 views

Options for humidifier

Winter is approaching and the cool weather is making the air dry in our home. We're using room humidifiers but want to install a humidifier which can go on our furnace. However, we have very limited ...
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521 views

Steps for annual maintenance on a fuel oil furnace?

We have fuel oil and this year I'd like to try and maintenance the furnace myself: By "maintenance" I mean "clean it up so that it runs well throughout the winter." Just a basic tuneup and cleaning. ...
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354 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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944 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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1answer
1k views

Pilot Light keeps going out when thermostat is kicking on furnace

So I have had furnace man come out 4 times, plus the Gas company. Here is what has been done: - New thermocoupler - Two new gas valves - New Orface and line blown out - Gas company changed gas valve ...
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1answer
447 views

Flame sensor in Trane XV90

I have Trane XV90 that was blowing cold air while it was on heat. I have recently changed the ignitor (which seems to work just fine) and the flame sensor (which seems to be failing already). I just ...
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1answer
358 views

Armstrong S-25 Pump Motor Lubrication?

Recently replaced a leaking bearing assembly on my Armstrong S-25 pump. The previous one required oiling, the new one is the permanently lubricated MF/BF model. I look forward to not having to ...
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1answer
196 views

Furnace came on when it shouldn't have

I happened to be down in the basement a short while ago and heard the furnace turn on and off after just a few seconds. About a minute later it came on and this time it stayed on for about 15 seconds ...
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2k views

Goodman Furnace igniter glows but doesn't ignite

Specs: Goodman Model GDS80703, over 10 years old, Control board replaced 2 years ago 2 months ago, it just started glowing and not igniting, and after doing some basic troubleshooting (Reboot, clean ...
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442 views

Cracked heat exchanger, gas furnace, a scam?

Had gas furnace serviced (routine yearly) and was told the heat exchanger was cracked and might pose a CO problem. System shut off and tagged. Told I needed to replace exchanger or get new furnace. ...
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86 views

What causes furnaces to break in 16 to 20 years?

Why do furnaces need to be replaced in this regularly-occurring amount of time?(http://www.homeenergycenter.com/8furnace_signs.html) Is there something about the physics of the high heat and ...
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289 views

Are black marks on the wall over a radiator cause for concern?

I'm looking to purchase a home that has a hot water system. This home shows black marks above the radiators on the painted walls. What does this mean and should I be concerned? The previous owner ...
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224 views

I have a slantfin hot water furnace ,it goes on then shuts off every 2 min until. It reaches the set temp

Slantfin furnace goes on and off every 2 min until it reaches set temp
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2k views

I want fan ON 24/7, NEVER turn off. How to force fan on even when furnace turns on?

I HATE that EVERY time the furnace toggles on, it turns OFF my fan and no fan for about 3 minutes. EVERY NIGHT this WAKES ME UP throughout the night. It is so bad that I decided to turn the HEAT OFF ...