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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How to figure out how to wire a 2 wire furnace to 3 wire thermostat
I have a 2 wire furnace and want to wire a 3 wire thermostat. My red wire is connected to the c in the transformer and the white is connected to the load. It works fine 2 wire but I dont want to mess ...
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Water is dripping from the furnace exaust flue
I replaced my hvac and noticed that my flue is dripping water. Wondering what might cause it? I assume some sort of condensation, but I don’t know what should I do to fix it.
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Wired “like” a dual transformer
I'm trying to update to a smart thermostat and my current one is wired like a dual transformer but I only have a single hvac system in the basement. Any idea why?
My plan is to move the blackwire ...
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1answer
16 views
Furnace shutoff switch outlet only hot when furnace is running
I have an old Aprilaire 700 powered by the 110v outlet on the side of my furnace. I recently replaced the old humidistat with a newer Aprilaire 60 Digital. This humidistat comes with the blower ...
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1answer
24 views
Use a 2-wire line voltage thermostat on a 24v / low voltage 2-wire furnace
This is an ancient furnace at my aging mother's. Basic 24v thermostat, two wires only, the original from my childhood used a mercury switch. There are some commercial, line voltage, 2-wire thermostats ...
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1answer
37 views
Where to connect C wire on older furnace
Upgrading to a wifi thermostat and already have extra unused wire from furnace to wall, just not sure where to connect it at the furnace.
I do have central air installed, and assume the blue wire ...
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2answers
40 views
Fan blower motor of Bryant furnace keeps running after flame is off
Fan blower motor keeps running in winder after the room temperature reaches the setting. Occasionally, especially in the case that the outside temperature is very low, the motor stops as expected. But ...
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1answer
53 views
Can I place a cap on my furnace exhaust to keep rainwater out?
I have a Lennox high efficiency furnace the vents out the roof with plastic piping, both fresh air and exhaust. The fresh air pipe terminates above the roof with a U-shaped pipe at the end of it, I ...
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1answer
19 views
Furnace Inducer Whirrs on and off before igniting, works when I tap circuit board
My furnace gets the signal from the thermostat, then about half of the time, the inducer motor whirrs on and off over and over. Sometimes it runs continuously without ever lighting.
When I open it up,...
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1answer
33 views
Small part of filler in furnace is stuck. Can I still insert a new filter?
Bottom of furnace filter stuck can I still put new one in
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1answer
30 views
motor wire pinout
i have an older furnace and i need to change out the blower motor soon the original motor is getting bad. bushing bad. anyway i got another motor the same frame size but it came with 4 wires. white ...
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3answers
90 views
Furnace not turning on, and can anyone identify these sensors?
My home has a gas furnace with electronic ignition (intermittent pilot). Sometimes it doesn't want to start up, even with the thermostat turned up, and it indicating heat should be on. The fan-only ...
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2answers
46 views
How should I know if my humidifier work?
I have a Aprilaire 600 Humidifier installed in my basement, as per the manual it should automatically kick off when the lack of humidity is detected.
It didn't seem happening. After I adjusted the ...
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1answer
31 views
Furnace Troubleshooting- Inconsistent Error Codes
My American Standard furnace ("Standard" Model, year 2003, 12 or 13 SEER) gave an Error Code 2 when first turned on- "External lockout, retries or recycles exceeded." (4 fail to ignite cycles ...
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1answer
51 views
Furnace Blower Motor fan hums but wont start
Furnace Blower Motor fan hums but wont start until I turn it by hand, then it runs fine. What should I check?
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30 views
Trane XL1200 furnace not heating
I have an older Trane XL1200 gas pack furnace/AC. I just tried to turn on the furnace and nothing happened. Looking at the control board the led code told me it was a pressure switch problem. The ...
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27 views
AC being turned on when calling for humidity
My newly installed Skuttle HSP2000 steam humidifier, controlled by a Generalaire GFX3 humidistat and wired to a Lennox G40UH-48B-090-14 is turning on the AC when being called for humidity. I've ...
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1answer
45 views
is the 24v transformer output ~27v normal?
i found my carrier 58pha090-016 furnace had no flame with the igniter on, and exhaust fan running, etc. it kept trying 3 times then stop. i reset the power switch of the whole system, the same cycle ...
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46 views
Ruud furnace keeps blowing 24 VAC 2 Amp fuse within 12 hours
Help!
20 year old Ruud 90 Plus condensing gas furnace with JCI G961DAJ-2401 controller keeps blowing its 24V AC 2 Amp fuse. I tightened the wires, nothing looks wrong.
I measured the current for each ...
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27 views
intertherm nordyne furnace pilot light keep blowing off
I have a thermordyne standard gas valve furnace model number M1GB 090A AW.
I had this problem for almost 4 years, the pilot light will get blown out after one or two runs, and I have to relight it.
...
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2answers
78 views
After blowing heat the fan won't stop, continue blowing cold air for prolonged period of time (30+ min)
Not always, but often the furnace continue blowing cold air after blowing heat. It may blow cold air for more than 30 minutes. Under this conditions I also see the error code (8 red flashed) "Ignition ...
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1answer
35 views
Furnace heat duct for basement
I'm trying to install a heat exhaust vent on the side of the drywall in the basement, see pic. The issue is that the the register is too small for the boot. This is normal if the exhaust is in the ...
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1answer
48 views
I need a signal when my furnace fan turns on
I want to install a motorized fresh air damper that opens when my furnace fan comes on. Is there a place where I can pull this signal off of the furnace board? Thanks!
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29 views
How to newly wire furnace condensate pump that contains a safety switch?
I would like to replace my current Little Giant furnace condensate pump that has no safety switch with the Little Giant VCMA-15ULS, 65 GPH Automatic Condensate Removal Pump w/ Safety Switch - SKU ...
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1answer
1k views
How to electrically ground a gas furnace connected with an armoured cable
My gas furnace will not turn on. I verified 120V where the armoured cable enters the furance, so I was going to continue testing for voltage before and after the transformer (with the door safety ...
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1answer
51 views
Position of dryer vent relative to gas meter and furnace intake
As part of renovations to our house (built in the early 70s) we are reconfiguring the laundry room and moving appliances to the opposite wall. The laundry appliances will now be to the left of the ...
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1answer
51 views
Adding a C wire and fixing White vs Red on my Furnace
TLDR: I think I need to flip R and W wires, and to splice the blue (C) wire to the brown wire coming of the transformer. Is this correct?
Long version:
Like many others on here, I'm trying to add a ...
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1answer
42 views
April Aire 600 powers off while furnace is firing
After having a new furnace and AC installed in the summer of 2018, replacing my 20-year old equipment, the existing AprilAire 600 whole-house humidifier behaves differently than before.
During the ...
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1answer
42 views
Secondary C Terminal on Furnace Circuit Board?
I was trying to install an Ecobee thermostat, and there was no C wire installed. When I went to install the power extender kit, I saw the standard C wire terminal was broken out of the black plastic ...
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0answers
19 views
Lennox G51MP shutting down with Primary/secondary switch fault
I have Lennox G51MP-48c-090-06 ~14yrs old, starting up for first time this season. It is throwing error code: Primary or secondary limit switch open.
Unit shows normal operation when powered up and ...
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2answers
39 views
Which professional should I call for leak coming down the furnace exhaust flue?
During heavy downpours, especially ones when windy, water would begin to trickle and drip from the outside surface of the exhaust flue in the basement. Not sure how long this has been going on since ...
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3answers
100 views
Where to add a c-wire on my Goodman furnace?
I'm looking to upgrade my old thermostat and need to run a c-wire. Where would be the best place to tap into?
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34 views
The burner on my Lennox G40uh furnace will not ignite
I have a Lennox G40 series furnace and the gas valve will not open. After it does the preliminary start up I get 27V to the gas valve, but only for about half a second.
Periodically the LEDs will ...
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1answer
51 views
Furnace/HVAC issues in new build
Just had a couple of questions. I have been in new build townhouse for a month and noticed a couple of things but have been away several weeks so just dealing with it now. Some of this I am sure I am ...
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1answer
41 views
Furnace relay - old one says 18 LRA, replacement says 48 LRA - Does it matter?
forgive me if this is a newbie question. I am replacing a relay inside an electrical furnace/air handler. It is a relay model 90-293Q. The original one I have specifies it as "8 FLA, 18 LRA" but the ...
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79 views
Only getting 15-16 volts from Furnace R and C
I recently purchased a smart thermostat. Because it needed a common wire and I only had a 3 wire setup, I ran a new thermostat wire to my furnace. However, I now get only 15 volts (inconsistently, ...
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1answer
33 views
Water around furnace: culprit?
Problem:
After heavy rain, water pools around our basement furnace. After climbing onto the roof, I found a mysterious (plumbing?) vent.
This post seemed relevant, but 0.5 gallons comes in after a ...
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1answer
38 views
Add common wire to furnace
Trying to add common wire to furnace for smart thermostat. Looking at wiring diagram, it looks like common wire off transformer is blue, switches wire color to white (via wire cap), then back to blue (...
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1answer
40 views
My blower fan won't turn on unless AC is running
So first of all, I've changed nothing: same thermostat and same everything.
I typically run my blower fan 24/7, but a few days ago it stopped working unless the AC is on. Which tells me that the ...
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72 views
Wiring AC condenser to Furnace
Hello
So this is what I was left with
I am trying to tie in fan on/off and a AC condenser
I have 2 wires for my limit switch, 2 wires from my 24ac transformer, 2 wires from my AC condenser and 2 from ...
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28 views
Ecobee installation with two Rh wires, occupied G wire and HRV
I just moved to North America from Europe (hence why furnaces, HRV systems etc are totally alien to me) and I'm having trouble understanding how to wire up an ecobee3 lite to replace my Honeywell ...
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1answer
34 views
Could my furnace be leaking due to condensation neutralizer?
I posted this and the main suspect was condensation pump but after troubleshooting, the pump is working fine (tested standalone). Now I wonder if the leak could be due to the condensation neutralizer; ...
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2answers
41 views
Chronic Flame Sensor Failure - Furnace and Water Heater
My house is 9 years old. About 5 years ago the Lennox gas furnace began to go into lockout. The problem was diagnosed as a dirty flame sensor. Shortly after, the same problem occurred with the Rheem ...
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1answer
102 views
Is my furnace leaking water?
I have water accumulated in my basement, that I squeezed out using towel. It was about 8 gallons of water in all. The only source I can see is the furnace whose surrounding is wet but I have never ...
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1answer
33 views
Possible to have more than one wire connected to “G” terminal in furnace?
I have a 25 year old gas furnace without A/C. I had a 2 wire basic thermostat that I have replaced the wiring with 5 wires and also a new Nest 3rd generation thermostat. On the wall beside the ...
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45 views
Thermostat wire does not go to Furnace
My thermostat wires go to a control panel heat pump system which go to the furnance , i need to wire a c wire but not sure how to go about this with the york control panel
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Furnace blower cutting in and out during A/C use
Backstory:
I fired up my air condition for the first time this season (single family house) and felt lukewarm air coming out of my ducts. When i went outside i saw that the condenser was not turning ...
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46 views
Fuel gas CSST line allowed in plenum in Texas?
I recently visited a house. The host pointed out something interesting.
The furnace AC combo is in an indoor closet and is vertical upflow and sits on top of a filter base that sits on top of the ...
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1answer
64 views
Goodman furnace - C Wire connection
I'm trying to connect the C wire in my Goodman furnace in order to install a new thermostat. I've read all the posts on this forum about this specific issue so my question is whether i'm in the right ...
