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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Installing a Honeywell HZ432 for four zone wireless heating

need help with wiring setup. Current setup Gas furnace (heating, no cooling): standard four zone gas furnace setup with hot water circulator 4 zones (3 wired, 1 wireless) Setup: Honeywell THM5320R (...
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HVAC / Furnace Evaporator unit in attic leaking cold air

We have an A/C (and heat) unit in the attic with force air ducts going to the ceilings in the rooms. I was in the attic today when the A/C turned on. I felt cold air come on my leg when I was near the ...
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Why is my electric furnace warm if it isn't being used?

Our furnace has not been used as the weather has been fairly warm lately. It may have turned on for a minute the previous night, but I do not know. Anyways I was walking past furnace and noticed I ...
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Trane VX99 furnace fan to run

I would like to have the fan turn on and blow non-a/c. I only see 2 wires coming from the thermostat. In
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Furnace Short Cycling - Carrier Code 33

We have a Carrier 58STA/STX Furnace that is only short cycling in Heat and not A/C. When it cuts off it is throwing Code 33 which is pointing to the following issues: Dirty Filter or Restricted Duct ...
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Why is the combustion chamber on my furnace vibrating and humming when the air conditioner is on?

I replaced the blower motor, blower wheel (squirrel cage), and run capacitor in my Goodman GMS80904BNBB furnace (1994 model I believe) because it showed signs of bearing and capacitor failure. First ...
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Is it normal for air to be leaking from this part of the HVAC?

First time living in a house. While I was cleaning (AC was also running) I noticed that somewhat cold air leaks from the circled part of the furnace on either sides. Not sure if this this information ...
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Furnace breaker wont stay on

I tried turning on the AC and it won’t run. Checked the breaker box and the furnace breaker is flipped. The breaker won’t stay in the on position When I flip it bacm. So I must have a short ...
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59 views

Wiring for 2-stage thermostat and 2-stage furnace with single stage cooling

I got my furnace and A/C unit replaced last summer. The new furnace has 2-stage heating, the A/C unit is single stage. The installers put in a single stage thermostat, so as far as I could tell it was ...
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43 views

Run Only The furnace fan

I have an old unit that has no control board. It works with a sequencer. (Coleman 3500A816) is it possible to wire it up to to be able to call only the blower to come on and not the heat as well? !
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Recomendations or information on adding biocides in furnace pan

I have heard that it is recommended to add some amount of biocides to a furnace in order to prevent mold building up in the furnace pan. Is it common in residential buildings, or more common for ...
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79 views

High Efficiency Furnace vented through the roof. How screwed am I?

I'm investigating installing a central air system and in doing so it was brought to my attention that my high efficiency furnace may not be installed properly. I'm in a narrow semi without much ...
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Connect two LP-GAS High-Eff +95% Furnaces to one LP Tank

Connect two LP-GAS High-Eff +95% Furnaces to one LP Tank will reduce supplier refill to one location on House. Furnaces 100K BTU and 60K BTU. To reduce refill to one location (currently two tanks on ...
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Increase fan speed (wiring) on Bryant Legacy Furnace

I have a two story house. The second floor gets hot even with the AC going. Right now, with no AC running and the thermostat set to “fan on”, the blower is set up to run at low speed. Since it’s a 3 ...
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59 views

Side effects of wire mesh inside vent covers

I am considering tacking wire mesh (such as from a window screen) onto the inside of my indoor furnace/AC duct vents as well as the outdoor intake vents, for pest control. I know doing it inside the ...
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Fan Only operation not working - gas forced air furnace

So i followed online guidance to enable "fan only" mode for my forced air gas furnace, Essentially that was to connect the "G" terminals on the t-stat and the furnace board. Seems simple enough, but ...
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25 views

Both reusable and disposable furnace filter?

I recently discovered that my furnaces (Rheems) have reusable "permanent" filters, but they also have a disposable filter tray. Are they intended to both be used simultaneously, or are homeowners ...
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Thermostat not getting power (Nest E74)

I replaced an old Honeywell thermostat about a month ago with a Nest thermostat. Friday Nest started displaying an E74 error. I have two furnaces and two outdoor units, one for upstairs and for ...
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Rheem RGDG unit turns on w/thermostat off, blower come on and inducer motor switches off and on

I've having a problem with my rheem model rgdg-10nbrjr The air conditioning works, turning it on at night it blows cold air and the house indeed gets cold. However the furnace unit itself ...
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Furnace Connection Question

I recently plan to install a smart thermostat in my house and I found there is a pair of wires(black and white) were connected to the Y and B/C terminal of my furnace. I tried to track where it goes ...
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Can I Effectively Jump my Furnace Wiring for A Long Time Safely

So I live in an rental with a forced air furnace. The thermostat that controls it is an old honey well that uses ancient analog components. It works well during the winter for heating, but ...
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3answers
35 views

Furnace intake on both floors

I have a furnace located in my basement in a small enclosed room. I also have a large vent upstairs above this room in my kitchen. I always thought that the furnace takes the air from the kitchen ...
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1answer
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Can I have a shared exhaust flue for a high efficiency furnace and tankless water heater?

I recently purchased and am installing a 96% efficiency two-stage gas furnace. The old unit was an 80% efficiency unit using a 4" metal flue. This flue merges the exhaust of both the hot water heater ...
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88 views

Groundwater cooled heat exchanger - forced air

I have kind of a crazy idea I have been scheming - I live in Alaska, and have a private well - the groundwater here is very cold(40-45F) or so. The last couple of summers have been miserable hot up ...
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Weak airflow after replacing furnace and add new A/C

I had Furnace HVAC before and I made a mistake not knowing what I had. We never had A/C. Recently I purchased this package from Costco: LENNOX ELITE SERIES AIR CONDITIONER SYSTEM XC13 LENNOX 80% 2-...
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49 views

Pilot light continually burning

The pilot light on my gas fire usually goes out once the fire is lit and I have released the switch. Now for some reason the pilot lite remains lit and doesn't go out until I turn the fire off. This ...
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37 views

Why does my furnace have a yellow termainal?

I don't have the manual for my furnace, and the terminals are labeled C W R G and Y. The internet generally refers to Y as Cooling or Compressor. So what does Y do on my furnace?
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replacing toggle switch on furnace red-green with thermostat

currently my furnace is connected to a two wire red-white thermostat. the furnace has comon, red, green, white, and yellow terminals. red and green are connected to a toggle switch on the side of the ...
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Leaky expansion tank overflow

I have a gas fired furnace with forced hot water. Off of the expansion tank there is a drain pipe. Recently it started leaking, roughly a mason jar a day. Why is this happening and can I solve the ...
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Variable vs Single or 2-Stage Furnace — Noise Issue

Will a much costlier variable speed be significantly quieter than a single or 2-stage furnace in a TV room where I'm adding a cold air return-- also adding central air to entire house.
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23 views

furnace thermostat problem

Thermostat is reading crazy high temps when it is really 67. Furnace won't deliver heat. Fan works. Is it the thermostat (batteries replaced already) or the furnace?
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25 views

Vibrating PVC exhaust pipe from high efficiency furnace

We have a two year old house that has this heating season developed a vibration in the exhaust pipe that can be heard on the first floor of the house. It seems to have decreased as the season has ...
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187 views

Why is Thermostat Y wire connected to C terminal on furnace?

I have a Nest E thermostat, and like many others have lost wifi and getting low battery because I have no common wire connected. After looking at my old Lennnox 78ugf3-75-1 furnace, I noticed that my ...
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92 views

Does my utility room need fresh air? If so, possible solutions?

Our home has a ~ 13' x 12' utility room that houses our HVAC system and gas hot water heater. Adjacent to this room is another room that we would like to use for an office. Currently those two rooms ...
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29 views

Furnace keeps triggering pressure switch

I have a York (Coleman) TM9X060B12MP11B furnace that is about 7 years old now. For years I have had the issue that if it's cold outside, and often when it has been snowing, in the morning it kicks ...
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63 views

Doorbell Transformer

Trying to install a nest doorbell but need to change the transformer. I believe I found it here but it is attached to a switch next to the furnace. When I unhooked the wires the doorbell stopped ...
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WiringTrouble With replacing blower motor in my furnace

When replacing the blower motor in my furnace I notice the old blower motor had a Brown and a Brown and white wire going to the furnace off of the motor the new motor however does not Instead it has ...
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Why is one of my four baseboard heat zones not working?

No heat in baseboard. How to bleed just one zone. Thanks! Please see picture. ? I have a 4 zone valves. 1) water heater (works) 2) 1st floor air handler (works) 3) 2nd floor air handler (works) ...
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42 views

What amp rating fuse should be used for the low-voltage side of the control board in my Goodman furnace?

I have a Goodman furnace (model GMH80803BNBC) (with separate Goodman AC condenser). The specs (PDF) are located online. The control board has stamped on it, next to the fuse (for the low-voltage (24V) ...
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1answer
81 views

No power coming from c terminal on furnace

I am trying to set up a nest. My system was a simple heat only R/W wire set up. I attached the green wire to the c terminal on my furnace, but no power is being fed from it, or at least the Nest is ...
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51 views

Part on furnace making scratching noise

This spinning part on my furnace (not sure what the part is called) is making this scratching noise. When one section of the part hits the area behind it, it makes that noise. Any idea how I can ...
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53 views

Old Steam Furnace

I have a old steam furnace that is running fine now but it’s not hooked up to the switch or the transformer. I have a brown wire (cable with brown insulation) containing a red and a white wire coming ...
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1answer
27 views

Thermo Pride OL5-85 oil furnace and Aprilaire 60 humidistat

I have a Thermopride OL5-85 furnace. I've recently added an Aprilaire 600 humidifier, which comes with the Aprilaire 60 humidistat. Wiring diagrams for both are attached below. The humidistat is ...
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40 views

Thermostat turned off and furnace no longer works after doing some electrical work to a switch outlet

I was trying to install a smart switch to a double gang electrical box and unplugged wires. As I was working on the smart switch I had to disconnect everything. Much to my dismay, the switch was not ...
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My Goodman furnace shuts off

My Goodman furnace with purchase in 2015 and every year I have to clean the sensor this year it shuts off and I go in the basement and flip the switch and it comes back on it does it every 3 or 4 days
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38 views

How can we connect a smart thermostat to our heating system, which is a gas furnace and wood fireplace?

We have a KozyHeat wood fireplace connected to our older gas furnace. The idea is that the furnace serves as a fan when the fireplace is hot, or will use gas to heat the house if the fireplace is cold....
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Why is my furnace causing my electric bill to skyrocket?

I know it's the heat causing my electric bill to jump from $200ish to over $600 monthly. It runs almost constantly. It produces heat(astounding amounts) and blows it adequately. I don't think it's ...
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Intermittent Furnace Issue

So I have been having a bit of an issue with my furnace since installing the nest thermostat. The first day after I installed it was perfect. Everything was working. The second day I kept getting the ...
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29 views

Goodman furnace - intermittantly works (80% of time works, then one blink (ignition failure)

Goodman furnace - works most of the time. Then, it will give the one-blink indicator of ignition failure. We either wait for it to cycle (which can take 30m-1hr) or turn off the power to the furnace ...
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Can 2 stage furnace be forced to stay in low?

Can 2 stage furnace be forced to stay in low? My airflow noise (and duct pops) is loud enough to wake me up, so I want to test if low reduces this problem enough before I rip into the finished spaces ...

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