HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

Our furnace is no heating. I just changed the filter. It…

Our furnace is no...

Our furnace is no heating.

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

I just changed the filter. It doesn't seem to be lighting. The red LED is flashing 1 + 3 which indicates "Flame Sense out of sequence".

Contractor's Assistant: Do you plan on doing the work yourself?

Not sure, depends on how easy it is to get it going.

Contractor's Assistant: Anything else we should know to help you best?

I turned it off per the instructions, put the temp back up but still not heating.

Show More
Show Less
Ask Your Own HVAC Question
Answered in 17 minutes by:
11/20/2017
Gaztech
Gaztech, HVAC Technician
Category: HVAC
Satisfied Customers: 937
Experience: Owner at Gaztech
Verified

Hi I am Gaztech1, a independent technician, I will assist you with your issue.

Don't forget to rate the 5 star rating AT THE TOP OF PAGE after we are done. this will credit me for assisting you.

Can you give me the Make and model(inside furnace on side wall sticker)

are you ready?

Ask Your Own HVAC Question
Customer reply replied 9 months ago
It is a Lennox Elite.
M/N G61MPV-36B-071-10

OK so all you need to do is locate flame sensor, Its mounted in a way to sense the flame at the end of burners. held by one screw and one wire to it, looks something like this( press on link) take it out sand the end clean the put back in.

http://s3.supplyhouse.com/images/products/zoom/9006106205-3.jpg

Ask Your Own HVAC Question
Customer reply replied 9 months ago
Hello, anyone there?

Do you not see my answer? look again

Ask Your Own HVAC Question
Customer reply replied 9 months ago
now I saw your answer. Thanks. I'll go look for the sensor.
I assume the furnace has to be powered off prior to doing this, correct?

correct

Ask Your Own HVAC Question

Look under cumbustion chamber( metal box where burners are)

Ask Your Own HVAC Question

I am here

Ask Your Own HVAC Question

Or Your model you will need to remove access door where the round glass widow .of burner compartment to access it

Theres 4 or 6 5/16 screws on the picture

Ask Your Own HVAC Question

Your last picture is the blower compartment. Not there at all, burner box!! did youi find it?

Ask Your Own HVAC Question

Yes thats it.

Ask Your Own HVAC Question

Back of left side is the sensor, and it comes out from under the metal box like I said at first

Ask Your Own HVAC Question
Customer reply replied 9 months ago
that is really hard to get to. I don't know how I can get to the nut...

show me a clear picture of underside please

Ask Your Own HVAC Question

That is a tight spot, you could try sanding it if you can stick your hands inside box, or someone with small hands (child) or even glue sand paper on a small stick.

Other than that you could remove white plastic part that joins the fan to exhaust pipe.

screw is 1/4 inch hex driver.

Ask Your Own HVAC Question

Hello?

Ask Your Own HVAC Question
Customer reply replied 9 months ago
Yeah, really struggling to get at it.
Taking off the white/yellow tubing could be very difficult to get it back on.
Customer reply replied 9 months ago
I have a work phone call for the next 30min.
Ask Your Own HVAC Question
Customer reply replied 9 months ago
I was able to sand the sensor rod.
feels clean to touch.

Good job now does furnace work/?

Ask Your Own HVAC Question
Customer reply replied 9 months ago
Just about to try it.
Customer reply replied 9 months ago
Same thing! Red LED flashing 1 + 3 times, no apparent flame??

That should of worked?

is wire pluged in good to flame sensor?

do you get burner to light up for a few seconds?

Get someone to turn up t-stat while you are looking in the sightglass

Ask Your Own HVAC Question
Customer reply replied 9 months ago
The wire seems to be plugged in good.
I will have someone turn up temp while I am watching through the window.
Customer reply replied 9 months ago
I pulled the wire off, sanded down the end and put it back on.
I then god someone to dial it up while I watched and no flame.

Did the fan inducer start and Did you see the ignitor glowing orange?

Ask Your Own HVAC Question
Customer reply replied 9 months ago
The fan comes on, but no glowing orange igniter.
I am not sure if the fan inducer is something different from the fan at the bottom. The fans are definitely on.

The error code your getting is not what furnace is doing??

better get tech in to check it.

Ask Your Own HVAC Question
Customer reply replied 9 months ago
I will. Thanks for trying.
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,367
Experience: Furnace, A/C and heat pump specialist.
Verified

Hello my name is ***** ***** a totally different tech.

Ask Your Own HVAC Question
Customer reply replied 9 months ago
ok, hello.

The error code you are getting has nothing to do with a dirty flame sensor.Sorry for all the trouble you went through to clean it. The error is stating that there is actually a flame present when it should not be

Ask Your Own HVAC Question
Customer reply replied 9 months ago
Correct, no flame.

If board is sensing flame but flame never lights, replace the control board.These boards are known for developing stress cracks and giving erratic readings

Ask Your Own HVAC Question
Customer reply replied 9 months ago
Sounds a bit complicated changing the board.

It is really pretty much plug and play. However the board is pretty expensive .I personally would recommend having an onsite tech verify before spending the money for the board, but 90 per cent of the time, when we get a false flame or flame out of sequence it is going to be the board.

On rare occasions the issue could be something so silly as a loose ground causing erratic behavior but almost always the board

Ask Your Own HVAC Question
Customer reply replied 9 months ago
I will bring someone in.
I appreciate your comments. I must say a little frustrated that the first technician had it wrong. I could have had someone in this afternoon if I had know it was the board earlier.
Customer reply replied 9 months ago
Do you how much a new board might cost?

My apologies,I have no control over what other technicians tell you and cannot see the question until they opt out.If your issue was with a dirty flame sensor, the error would have been 1+2 (low flame current)

The board runs around 250.

Can you verify if this is your board?https://www.amazon.com/63W27-Lennox-Replacement-Furnace-Control/dp/B00FQHSR8E

airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,367
Experience: Furnace, A/C and heat pump specialist.
Verified
airheatman and 87 other HVAC Specialists are ready to help you
Ask your own question now
Customer reply replied 9 months ago
It sure looks like the same board. Thank you for your help. I wish we spoke earlier.
Cheers,
Mark

Thanks again for allowing me to help you.

Ask Your Own HVAC Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a hvac technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask airheatman Your Own Question
airheatman
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,367
9,367 Satisfied Customers
Experience: Furnace, A/C and heat pump specialist.

airheatman is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Phil

Phil

Mechanical Engineer

7,634 satisfied customers

Retired HVAC/ Electrical & Boiler contractor. Industrial

Rick Mather

Rick Mather

HVAC Technician

3,133 satisfied customers

35 years experience, HVAC

Matthew

Matthew

HVAC Technician

2,014 satisfied customers

14 years experience in the HVAC field of service, installation, Manual J & D calculations

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

1,024 satisfied customers

I have been an HVAC/R mechanic/technician for 30+ years.

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Rick Ridley

Rick Ridley

UK Heating Engineer

871 satisfied customers

Retired But have had 30 years on the tools, Ex CORGI

Tom

Tom

HVAC Technician

770 satisfied customers

16+yrs HVAC/R service. Residential Commerical Industrial

< Previous | Next >

Related HVAC Questions
The power went out and since then my AirFlo AF80MPA075B3B
The power went out and since then my AirFlo AF80MPA075B3B turns on but there is no heat and then shuts off. … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Lennox 80mgf burner flames keep going out - replaced the
Lennox 80mgf burner flames keep going out - replaced the filter and replaced the flame sensor … read more
airheatman
airheatman
HVAC Technician
6 years college
9,367 satisfied customers
I have a 310AAV furnace, installed new last year. It's on
I have a Bryant 310AAV furnace, installed new last year. It's on and warm around furnace but doesn't seem to be heating house. Any ideas? … read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
Ok, my gas furnace was not running again so I went to the
Ok, my gas furnace was not running again so I went to the thermostat and lowered it below the room temp and it clicked. I then raised the thermostat above the room temp and it clicked and started runn… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
my N9MP2 furnace blows seconds then stops regularly.
my N9MP2 furnace blows for 100 seconds then stops for 75 regularly. This seems like a very short on/off cycle. It's not keeping up when it's very cold out. Can i safely set it to heat and blow for lon… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
Phil. I have a problem with my furnace. Blowing cold air. American standard freedom 80
Phil. I have a problem with my furnace. Blowing cold air. American standard freedom 80 single stage. Red light blinking once every 2-3 seconds. Think that's system lockout -retires or recycles exceede… read more
airheatman
airheatman
HVAC Technician
6 years college
9,367 satisfied customers
MY Trane XE80 gas furnace blower continues to run after reaching
MY Trane XE80 gas furnace blower continues to run after reaching thermostat temp and the gas shuts off then it's blowing cold air unless I raise the temp on thermostat… read more
airheatman
airheatman
HVAC Technician
6 years college
9,367 satisfied customers
I have a Honeywell programmable thermostat. In the morning
I have a Honeywell programmable thermostat. In the morning when the temp is programmed to change the setting from 62 to 68 the furnace comes on but then aborts at about 66 degrees. I have to turn the … read more
airheatman
airheatman
HVAC Technician
6 years college
9,367 satisfied customers
Hey, I have a Lennox c33-24B-F. I notice that the furnace
Hey, I have a Lennox c33-24B-F. I notice that the furnace seemed as though it wanted to kick on, but then didnt after about 3 min. I tried to reset ignition switch and restarted. Again, the same thing… read more
hvacexpertjoe
hvacexpertjoe
Electronics Technician
Vocational, Technical or Trade Scho
80 satisfied customers
rheem rgpl furnace will not stay lit. Replaced the flame sensor,
rheem rgpl furnace will not stay lit. Replaced the flame sensor, reversed the polarity, added seperate ground to copper water pipe. Furnace cycles thru the lighting process 4 times like the manual say… read more
airheatman
airheatman
HVAC Technician
6 years college
9,367 satisfied customers
I have a Gibson KG6RC080C-16B furnace that is not heating... It
I have a Gibson KG6RC080C-16B furnace that is not heating... It uses Nordyne 624631-a control board and a 904081 gas valve. I am getting a constant flash from the red led on the control board. After r… read more
airheatman
airheatman
HVAC Technician
6 years college
9,367 satisfied customers
My rudd furnace seems to be developing issues that I am not
My rudd furnace seems to be developing issues that I am not sure if I should be concearned with? Example T-stat is set at 70, room temp is indicated to be at 68 system is on heat and auto fan setting.… read more
airheatman
airheatman
HVAC Technician
6 years college
9,367 satisfied customers
I have a york gas furnace FG8 125000 BTUH The air circulating
I have a york gas furnace FG8 125000 BTUH The air circulating blower was running continuous. The furnace started normally, but had 1 yellow 5 second flash diagnostic, (indicating false flame sense)? T… read more
airheatman
airheatman
HVAC Technician
6 years college
9,367 satisfied customers
Previous owner left without leaving manual. Dont know where
Previous owner left without leaving manual. Don't know where filters are. Front panels do not fit well. When anything jiggers the house -- such as road work or the roofer last week, the jets do not ig… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a White-Rodgers 50a50-298 controller, gas heat furnace.
I have a White-Rodgers 50a50-298 controller, gas heat furnace. The unit is continuously blowing cold air. Upon start up, once every 60 seconds, I see flame for 30 seconds. This occurs 3 times, and on … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Have spoken to M Ogalsbee (sp ) about our heater. Had to sign
Have spoken to M Ogalsbee (sp?) about our heater. Had to sign off before we resolved it. It is a carrier 58 STA/STX. The problem seems to be intermitant. Everything triggers fine but there is no flame… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
have a ruud silohuette 2 all of a sudden has decided not to
have a ruud silohuette 2 all of a sudden has decided not to work (the furnace part) fan works but nothing else. 2 green lights one flashing. Any suggestions? Thank you.… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
My furnace starts without lighting and then stops. Need Help.
My furnace starts to come on and then it just stops. The fan is blowing air for about 30 seconds. It sounds like it starts to light but won't stay lit. What do you think?… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x