All Questions
124 questions
4
votes
3
answers
1k
views
How to balance minisplits and oil furnace for winter heat?
We had a full set of Carrier mini-splits installed (1600 sq. ft, 2 stories, 5 heads), added to a very senior oil furnace.
We're still getting used to them. We opted out of the "smart" ...
- 155
2
votes
0
answers
25
views
Furnace won't stay on only when it previously ran/is hot
I have a bit of a weird problem with my Goodman GKS9 furnace (~15 years old): When the furnace is cold (i.e., was not burning for ~1hr), it starts up without problems and heats. When the furnace is ...
- 21
0
votes
1
answer
226
views
Furnace blows cold air, shuts off, then blows warm air
When changing the temperature on my thermostat, the blower kicks on and only blows cold air. This drops the temperature about 2-4°.
After running for a few minutes, the blower shuts off. About 30 ...
0
votes
3
answers
277
views
Heat pump vs gas furnace return air vent noise
I'm in Seattle and considering to replace my old single stage gas furnace (88k BTU output) with either these two options.
Heat pump + gas furnace hybrid
AC + gas furnace
The primary concern is about ...
- 1
-1
votes
2
answers
126
views
How do I find the source of my furnace's condensate leak?
I bought a house in November that had a brand new high efficiency furnace put in sometime in the summer. There is water coming out of the furnace and not the drain pipe.
Is this a clog in the pipe or ...
0
votes
0
answers
24
views
Why does the fan cycle on and off during heating cycle only?
My neighbor has an older model Carrier heat pump with electric strip heat. Here lately after she had maintenance done the fan indoor fan that is Will occasionally cycle on and off. I went over and ...
0
votes
1
answer
496
views
What keeps rain out of a Vertical PVC Concentric Vent?
All pics show are the Vent Cap, which is the exhaust and the inlet air cap. What is used for a RAINCAP?
- 11
0
votes
0
answers
72
views
Furnace wont stay lit
My furnace is short cycling very quickly after ignition. I put in a new flame sensor after cleaning the old one.
Then I checked each limit switch and all are closed and have continuity.
I checked the ...
-1
votes
1
answer
156
views
Should I replace an old furnace with a mini split unit? [closed]
I have a very small house that is close to being 700 ft.². I live in the middle of Illinois some winters it gets really cold , many degrees below zero. Last winter I noticed my furnace having a bad ...
- 457
0
votes
1
answer
195
views
Connecting Amana Furnace Pressure Switch
Hello fellow DIY'ers,
I had to turn on the heating for the first time this season, our Amana gas furnace didn't stay lit for more than ~7 seconds. I did some research online, ended up cleaning the ...
- 51
1
vote
0
answers
34
views
Furnace Return in basement
I have a duplex and one furnace crapped out likely because it had the return in the basement. It’s upstate NY, so it gets cold.
If I want it done 100% right. I need ducts run all the way to the top ...
- 11
0
votes
1
answer
360
views
Is a Cold Climate Heat Pump The Best Option to Replace Gas Furnace? [closed]
I live in the Canadian prairies (cold winter -30C or below possible, hot summer +30C or above possible). I recently purchased an AC unit and have had it installed. Recently, my circuit board on my gas ...
- 29
2
votes
1
answer
488
views
Help with replacement for inducer motor in Furnace
My furnace (Ducane cmpe05ou3) started to make loud noises. When I inspected the propeller of the inducer motor, is was cracked.
The motor is a Fasco No 702111361, P/N 20538701, 115V, 60Hz, 1.9A, RPM ...
- 145
2
votes
0
answers
3k
views
Older Coleman Electric Furnace Not Used
My wife's family has this older Coleman electric furnace in their mobile home that is not being used, instead they use electric space heaters. We're not sure how long the furnace has been unused or ...
- 95
4
votes
1
answer
1k
views
home heater furnace blower doesn't turn on [SOLVED]
FOR SOLUTION LOOK TO END OF POST
My furnace's exact model is MMHB-077ABHR-06
,Controller is UT-1018
I have a nordyne 7076700 gas furnace for a mobile home, and the blower never starts up when heater ...
2
votes
0
answers
835
views
Furnace ignites sometimes but not other times
When my York gas furnace turns on, the ignitor heats up and glows red, then the gas valve turns on and I can hear gas flowing. About 50% of the time the burners ignite and the furnace runs great after ...
0
votes
1
answer
709
views
furnace high limit switch turning off burners
I have a goodman furnace model gcs90904cxa. All filters are brand new blower replaced last year new limit switch vents open in house exhaust and incoming air vents clean inducer motor free turning. ...
- 1
3
votes
1
answer
565
views
Why is my heater constantly on?
I have a heat-only electric furnace. Bypassing the thermostat, the R and W terminals on the control board are always connected. The thermostat is good but something is causing the control board to ...
- 31
0
votes
1
answer
420
views
Is 2 stage furnace worth it in dual fuel setup?
I am replacing a gas furnace with AC unit with a gas + heat pump system.
Looking at 2 stage furnaces I was left to wonder if its advantages hold in that setup. If gas is only used for temperature ...
- 109
0
votes
0
answers
920
views
Why vent on first floor blows cold air mostly and hot air sometimes?
My house has 3 floors and gas furnace is on 3rd floor. First floor has total of 3 vents but one of those blows cold air most of the time and hot air rarely. The other 2 vents on the same floor blows ...
- 223
1
vote
1
answer
97
views
Would it be dangerous to tap an existing flame sensor circuit to create a common connection for my thermostat?
I'm considering using this answer to connect a common wire to my thermostat. I have the exact same setup, and have verified with my multimiter that the red T terminal outside F terminal beeps, while ...
- 125
0
votes
0
answers
76
views
Servicing my furnace
So every year I would have a technician come out and service our furnace. I'm not sure what all it entails to service our furnace, aside from changing the filter, but last year I learned quite a bit ...
- 401
0
votes
0
answers
1k
views
Cracked heat exchanger or bad inducer motor causing pressure switch stuck open?
15 year old York GY9S furnace won't fire due to pressure switch stuck open. It has two pressure switches. One switch connects to the collector box & is set to close at -.40 inH20. I got -2.20+/- ...
- 31
2
votes
1
answer
4k
views
Inducer motor turns off immediately after the pressure switch closes
My furnace is not working properly (ICM2805A control board, or Nordyne 624631A). When I turn it on, the inducer motor will start spinning and shut down immediately, the board will reset, and try again ...
- 51
0
votes
1
answer
27
views
Criterion 2 electronic ignition 3 rd burner not lighting
On my furnace all sequences run thru fine but occasionally the first burner ignites the second takes off but the third doesn’t what could this be
1
vote
1
answer
1k
views
Should I run my furnace fan constantly to distribute heat and moisture? [closed]
I have a house with four heating zones, three of which are pertinent to this question. A standard summer day might look like this:
Top floor - 23c-24c (slightly too warm, AC on most of the time on ...
- 191
2
votes
0
answers
291
views
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 ...
- 21
3
votes
2
answers
2k
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 ...
- 111
0
votes
1
answer
537
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 ...
1
vote
1
answer
2k
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 ...
- 19
1
vote
0
answers
343
views
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:
...
- 11
1
vote
1
answer
488
views
Force Furnace Blower to Run on Separate Schedule to Circulate Air
Appreciate any and all insights you might provide. I could tamper with this until I figured it out but I'm hoping that your collective expertise will save me some time and keep me safe! I've got an ...
0
votes
0
answers
42
views
Bryant Furnace problem
I have a Bryant furnace model #355CAV060100 when the thermostat is set in heat mode and on auto the heat comes on but the blower fan runs in low speed. If i switch the selector on evolution thermostat ...
0
votes
1
answer
1k
views
Furnace blower sometimes won't come on
I have a gas-powered forced air furnace. The last time I had a repair man look at it, he said it's 30 years old, so it's getting harder to find replacement parts.
It recently developed an intermittent ...
- 2,229
7
votes
2
answers
6k
views
Why can't a swamp cooler and a furnace be active at the same time?
New to living with a swamp cooler. I've been told by several sources (people and internet) that the swamp cooler and the furnace can't be on/active at the same time, and indeed my landlord switches ...
- 417
6
votes
4
answers
26k
views
Does my furnace suck air from outside?
I've tried Googling this but the stakes are quite high and I don't want to be wrong, so I'm asking here.
Wildfires are raging in California where we live, and the Air Quality is nearing the 'hazardous'...
- 171
1
vote
1
answer
221
views
What vent type and configuration does my furnace use?
I am trying to replace my 33 year old furnace. The brand is Carrier and model is 395BAW048095.
I couldn't figure out the correct vent type and configuration (down-flow, multi-position, up-flow).
I ...
- 361
0
votes
1
answer
1k
views
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 ...
- 11
2
votes
0
answers
2k
views
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 ...
0
votes
2
answers
6k
views
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 ...
- 231
0
votes
0
answers
66
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 ...
1
vote
3
answers
469
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 ...
- 37
1
vote
1
answer
1k
views
Dropped item in furnace duct
While trying to stop the ticking noise coning from my furnace ducts, I accidentally dropped a small piece of fire retardant foam (as you can see in the below photos) in one of the vertical furnace ...
- 272
1
vote
6
answers
6k
views
Connect two thermostats in parallel
I saw a thread about connecting two thermostats in parallel.
I could not add comment to that thread, so I put question here.
My tenants always shut off thermostat or reduce temp when they are not in ...
- 21
1
vote
2
answers
1k
views
Where is my furnace air filter?
We moved in to a house a few months ago and for the life of me I cannot find the air filter for the furnace anywhere. The furnace is a Payne brand. It's kind of old. In our hallway ceiling, we have ...
- 111
1
vote
1
answer
118
views
Half of furnace turned off?
I moved into this house about 10 years ago, I noticed on the furnace that one of the breakers for the electric coils is off with a note saying "Leave breaker off". After cleaning out the blower for ...
- 11
1
vote
1
answer
722
views
Why did a technician jump W to G on my furnace? [closed]
I have a York diamond 80 furnace and the control board burned out so Lowe’s came and replaced it. I’ve been using the heater because it’s winter right now but the other day I accidentally hit the cool ...
0
votes
1
answer
102
views
Propane wall furnace not firing
I have a propane wall furnance that is'nt firing, the thermostat is not appearing to trigger the unit. The pilot is fine and the thermostat is a simple unpowered one with mercury that appears to be in ...
- 105
1
vote
0
answers
2k
views
How to stop the humming noise coming from my gas furnace when on Auto Heat?
My gas furnace makes a humming noise when on Auto Heat, like as if the blower motor or capacitor was bad.
However, the blower turns on and sounds fine when thermostat is set to fan ON rather than ...
- 11
5
votes
1
answer
49k
views
Why does my furnace only work after power reset?
I’m having issues with my furnace sometimes not kicking on.
I hear the furnace start, But then it will not fire.
However, If I go down to the basement and flip the power switch off and on the ...
- 51