HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

Lennox 80mgf burner flames keep going out - replaced the…

Customer Question
Lennox 80mgf burner flames...

Lennox 80mgf burner flames keep going out - replaced the filter and replaced the flame sensor

Contractor's Assistant: I'll do all I can to help. How long have you been dealing with this?

Server always years - in the replacing the flame sensor seemed to do the trick - replaced it again this fall and still going out

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

Several years

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

Not that I can think of

Submitted: 1 year ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 9 minutes by:
9/17/2017
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,838
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Verified

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your

issue. First I’ll need some more info so I have a more complete picture of your situation.

Wha are the LED's on the board doing? what's the flash sequence? Don't remove the blower access panel you should be able to see them through the viewing port.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Flashing red - flashes faster when heat comes on
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

You should get a sequence (flash >fast or slow or off)when it shuts down prematurely. LED's are deginated #1 & #2. #1 is on the left assumng the thermostat terminal strip is below it.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
I only see LED1 - flashing continuesly - flashes faster when heat comes on
Customer reply replied 1 year ago
We keep the air circ fan on always
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

Ok, you have 2. Apparently 1 is off. I need to know which one of the 2 is flashing and only when the unit shuts down prematurely. Blower on manually has no effect on furnace operation

Ask Your Own HVAC Question
Customer reply replied 1 year ago
It is labeled LED1
Customer reply replied 1 year ago
It is flashing now - when heat comes on it flashes faster
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

For the third time, what does it do when the unit shuts down?? It doesn't matter hwat it does when it's firing.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Keeps flashing fast
HVAC Technician: Rick, HVAC Supervisor replied 1 year ago

I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Please help me it looked like it flashed three times and then flashing fast
HVAC Technician: airheatman, HVAC Technician replied 1 year ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,532
Experience: Furnace, A/C and heat pump specialist.
Verified

OK here is what should happen with the led.

Power to furnace but no call for heat light should be flashing slow

On call for heat light should start flashing fast and continue until end of cycle.

If furnace fails before cycle is complete, flash should change.

So power off then back n.Then call for heat and once if fails count the flashes

It should at that time repeat ( example: blink blink blink pause, blink blink blink pause would be a 3 flash error.

Ask Your Own HVAC Question
Customer reply replied 1 year ago
Led flashing normal. This issue has been many years. when we have changed the flame sensor it the past it seemed to do the trick. This fall we changed the sensor but flame still goes out for 1 minute then comes back on for 3-4 minutes and cycles like this.
Customer reply replied 1 year ago
Airflow seems ok out the vents. Blower is very dirty.
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

If blower is dirty most likely cutting out on high limit,clean blower and we will go from there

Ask Your Own HVAC Question
HVAC Technician: airheatman, HVAC Technician replied 1 year ago

This video will give you an idea on how to remove and clean

https://www.youtube.com/watch?v=xUTvbr1kmDk

Ask Your Own HVAC Question
Customer reply replied 12 months ago
Cleaned the blower and changed the high limit -,still cutting out. I'm thinking it is the pressure switch. What do you think.
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 Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7,426
7,426 Satisfied Customers
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial

Phil 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

7,426 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
I have a Carrier Carrier Weathermaker SXA080. The thermostat
I have a Carrier Carrier Weathermaker SXA080. The thermostat calls for heat. The burner fan comes on, about 10 seconds later the pilot comes on. It used to take at least a minute, sometimes more befor… read more
Heath.M
Heath.M
Refrigeration Mechanic
Vocational, Technical or Trade School
223 satisfied customers
I have a Lennox 80MGF. During the coldest weather, it intermittently
I have a Lennox 80MGF. During the coldest weather, it intermittently cuts out flame about 10 seconds after igniting. I'll pursue possible remedies that I've found online. But I am wondering if the fla… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Lennox 80MGF blower starts up ignitor lights gas
I have a Lennox 80MGF blower starts up ignitor lights gas burner for about 4 sec 4 times and then lockouts for 60 min. Both led lights flash fast.… read more
R G
R G
44 satisfied customers
My lennox furnace 80MGF does not want to stay on. The light
My lennox furnace 80MGF does not want to stay on. The light flashes 4 times suggesting it it is a Hi-limit or Roll-out switch Open. Any ideas how I can resolve this. Allan… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Lenox 80mgf series furnace. The control panel has
I have a Lenox 80mgf series furnace. The control panel has two alternating green lights, indicating the burners failed to ignite. How can I fix this problem?… read more
A-1 Tech
A-1 Tech
Service Manager
Vocational, Technical or Trade Scho
361 satisfied customers
I have a lennox innovator series custom heat. Thermostat set
I have a lennox innovator series custom heat. Thermostat set at 69 ... but furnace won't heat above 65. Furnace seems to start, starter glows, then all burners fire for about 2 seconds, then furnace s… read more
Heath
Heath
Vocational, Technical or Trade Scho
1,002 satisfied customers
I have a Lennox 80MGF series furnace. It is 17 years old. I
I have a Lennox 80MGF series furnace. It is 17 years old. I am having intermmitent trips. It gives me a flashing 2 LED sequence. In observing the lightoff sequence, sometimes flame is established (sol… read more
Tim H
Tim H
Lead building engineer
Vocational, Technical or Trade Scho
1,922 satisfied customers
I have a Lennox G60UH furnace. Giving error reading
I have a Lennox G60UH furnace. It is barely 4 years old. we have been getting a number of errors over the past 2 winters and have had various service technicians out here. It used to give us a 4+5 err… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
7,426 satisfied customers
Ive got an 80uhg3/4 gas furnace which is occasionally failing
I've got an 80uhg3/4 gas furnace which is occasionally failing to stay lit at start up. I think it's happening when it calls for ignition when it is already on a post burn cool down. It fires up and j… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
Have Lennox Diplomat Furnace with Ignition Control Board EGC-1.
Have Lennox Diplomat Furnace (80MGF4/5-100A-1) with Ignition Control Board EGC-1. Issue: Both Diagnostics LEDs are blinking together and fairly fast (indicating a "Heat" demand / Normal Operation). Th… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Lennox 80MGF 4/5-120A-1 furnace. Same symptoms as
I have a Lennox 80MGF 4/5-120A-1 furnace. Same symptoms as asked back 300 days ago by a different customer. Just need a little help with diagnosis. I'm able to troubleshoot with you. I have a Lennox M… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
i have a lennox home a/c heater system. one up stairs, one
i have a lennox home a/c heater system. one up stairs, one down stairs, the one down stairs when the heater comes on, you can hear the fire start, then go off, then start again, this happens several t… read more
HVAC_Doug
HVAC_Doug
Vocational, Technical or Trade Scho
My lennox Elite Series furnace Manufactory # G24M2-45A-12 serial#6399E
My lennox Elite Series furnace Manufactory # XXXXX serial#6399E 00881 is not working correctly. The thermostat is telling the furnace to turn on, but the furnace is not responding. If I flip the break… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
4,135 satisfied customers
I have a Lennox 80MGF and the LED diagnostic code shows it
I have a Lennox 80MGF and the LED diagnostic code shows it is in "watchguard mode". The igniter lights the gas that goes to the burner, but immediately shuts down. This retries several times before th… read more
BARRY
BARRY
owner
Associate Degree
56 satisfied customers
Hello, I have a Lennox Elite Surefire gas furnace converted
Hello, I have a Lennox Elite Surefire gas furnace converted to propane. Model #G23Q2/3-75-6. It's about 10 years old. The burners will light for about 2-3 minutes than shut off for about the same. Thi… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
My Lennox diplomat furnace is acting up. When it starts up,
My Lennox diplomat furnace is acting up. When it starts up, the exhaust blower runs the it ignites for a few seconds then goes out. The exhaust will continue to run and it will ignite again for a few … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Amana guc090b35b with a W/R 50e47-170 controler. Furnace will
Amana guc090b35b with a W/R 50e47-170 controler. Furnace will light after normal start-up and run from 1 sec. to a full cycle. Most of the time it is between 1 sec. and 3 minutes. I have cleaned the f… read more
Mark Henley
Mark Henley
HVAC Controls DDC
3,209 satisfied customers
My furnace is a Lennox Elite series. It works but has the
My furnace is a Lennox Elite series. It works but has the following symptoms. Sometimes the igniter will spark but only about 3 times. Usually it sparks repeatedly in succession until the pilot lights… read more
coolman1973
coolman1973
AC/Heat Tech
Vocational, Technical or Trade Scho
162 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