HVAC

Have HVAC Questions? Ask an HVAC Expert for Answers

Ask an Expert,
Get an Answer ASAP!

HVAC
This answer was rated:

I have a Lennox furnace, but sure if the furnace is lit. My

I have a Lennox furnace...
I have a Lennox furnace, but i’m Not sure if the furnace is lit. My heater is not heating up. The red light on the furnace is flashing 3 beats at a time
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: This is a brand new house with a brand new furnace
JA: Do you plan on doing the work yourself?
Customer: For tonight, yes
JA: Anything else we should know to help you best?
Customer: I double checked the settings and increased it. It set at 78, but temp is still 70
Show More
Show Less
Ask Your Own HVAC Question
Customer reply replied 1 month ago
Ok.
Customer reply replied 1 month ago
Something looks unplugged inside the removable paneling area
Answered in 2 hours by:
10/29/2017
Daniel Plourde
Daniel Plourde, HVAC Technician
Category: HVAC
Satisfied Customers: 356
Experience: hvac technichian at performance plumbing and heating
Verified

HI I AM DAN I CAN HELP YOU WITH THIS. THE 3 FLASHES IS AN ERROR CODE SIGNALING THAT THERE IS SOMETHING WRONG AND WILL PREVENT THE FURNACE FROM COMING ON. IF YOU COULD POST A PICTURE OF WHAT YOU THINK IS DISCONNECTED INSIDE I CAN HELP YOU WITH RECONNECTING IT.

Ask Your Own HVAC Question

thank you for that. you are correct those 2 white plugs should be connected, make sure the power is off to the furnace, connect those 2 plugs together and turn the furnace back on. then it should start up and light. let me know if that works or if you get another error

Ask Your Own HVAC Question
Customer reply replied 1 month ago
White to white and black to black?

yes the plug should only go together one way

Ask Your Own HVAC Question
Customer reply replied 1 month ago
Do I have to wait for 5 minutes to drain the gas before lighting it?

no just turning it off and back on will be fine

Ask Your Own HVAC Question
Customer reply replied 1 month ago
I hear it going on! Steady red light in the furnace
Customer reply replied 1 month ago
Thank you!

ok glad it worked for you. if you have any more questions about this please let me know and if you could rate my service by selecting one of the 5 stars on your page I would appreciate it. thank you for using this service

Daniel Plourde
Daniel Plourde, HVAC Technician
Category: HVAC
Satisfied Customers: 356
Experience: hvac technichian at performance plumbing and heating
Verified
Daniel Plourde and 87 other HVAC Specialists are ready to help you
Ask your own question now
Customer reply replied 1 month ago
It didn’t work to bring the temp up. The thermostat is set to 77, but it’s still 69

IS THE FURNACE STILL RUNNING?

Ask Your Own HVAC Question
Customer reply replied 1 month ago
No. The red light is flashing 7 times now. Sorry. The furnace is in the attic, and I fell asleep
Customer reply replied 1 month ago
I fell asleep Downstairs.

OK CAN YOU PROVIDE ME WITH THE MODEL NUMBER OF THE FURNACE SO I CAN LOOK UP THE ERROR CODES

Ask Your Own HVAC Question
Customer reply replied 1 month ago
Where will the model number be? I searched for it earlier but unsuccessful locating it
Customer reply replied 1 month ago
I went through all the Lennox product pics, and looks like a Merit

it will be on the inside of the furnace on a sticker with a lot of other information.

Ask Your Own HVAC Question

this is a list of errors I get for that model. does the led flashing correspond to any of these

Ask Your Own HVAC Question
Customer reply replied 1 month ago
Not really. The red light looks like an alternating fast flash, but there’s no green light.
Customer reply replied 1 month ago
When it started last night I only saw the red light flashing slowly consistently.

ok next step is to turn the power of for 30 seconds and then back on and watch it stat up as it goes through te cycle watch to see when the error comes back and if the flame ever lights

Ask Your Own HVAC Question
Customer reply replied 1 month ago
It’s a solid red light. No green

.

Ask Your Own HVAC Question
Ask Daniel Plourde Your Own Question
Daniel Plourde
Daniel Plourde
Daniel Plourde, HVAC Technician
Category: HVAC
Satisfied Customers: 356
356 Satisfied Customers
Experience: hvac technichian at performance plumbing and heating

Daniel Plourde 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

6,877 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

Kenton Guidry

Kenton Guidry

HVAC Technician

963 satisfied customers

12 years install/service experience.

Brian HVAC Guy

Brian HVAC Guy

HVAC Technician

953 satisfied customers

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

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 lennox furnace and no heat and giving LED code is
I have lennox furnace and no heat and giving LED code is slow flashLED1 and Steady ON on LED2 … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a lennox furnace. the heat will come on for a few
I have a lennox furnace. the heat will come on for a few minutes and the control board shows a red and green light flashing quickly. then, it shuts off and shows a single green light flashing slow. my… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a Lennox furnace, model 80MGF3/4-100A-1. It's cycling
I have a Lennox furnace, model 80MGF3/4-100A-1. It's cycling the heat on and off - gas is lit, burns for about 30 - 40 seconds, then shuts off. Tries again after 45 second purge. Only LED code is fast… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a lennox furnace and itis not owrking. The LED light
I have a lennox furnace and itis not owrking. The LED light isn't on and I'm not getting any response at all after turning on the thermostat. It's alomost as if thewhole unit has been turned off. I t … read more
HVAC_Doug
HVAC_Doug
Vocational, Technical or Trade Scho
0 satisfied customers
My thermostat on my Lennox furnace suddenly has gone
my thermostat on my Lennox furnace suddenly has gone completely blank, and thus the heat is not running. I assumed the battery might need replacing, but now I don't think there is a battery. Do I need… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Have a Lennox furnace that keeps popping 3 amp breaker and
Have a Lennox furnace that keeps popping 3 amp breaker and won't light pilot … read more
Iohn Keffer
Iohn Keffer
HVAC Tech
Associate Degree
30 satisfied customers
My 20 year old lennox furnace only works when the blower is
my 20 year old lennox furnace only works when the blower is left on … read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a Lennox furnace that's not working. It has a
I have a Lennox furnace that's not working. It has a flashing green light. The label says check flame sensor. Where is this sensor?… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
I have a Lennox furnace and I am getting rollout switch open
Hello, I have a Lennox furnace and I am getting rollout switch open code. I am having a hard time finding it. Outside of calling a technician what can I do? … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a Lennox furnace, but sure if the furnace is lit. My
I have a Lennox furnace, but i'm Not sure if the furnace is lit. My heater is not heating up. The red light on the furnace is flashing 3 beats at a time … read more
Daniel Plourde
Daniel Plourde
HVAC Technician
356 satisfied customers
I have an old lennox furnace that the pilot light won't stay
I have an old lennox furnace that the pilot light won't stay lit. I have replaced the thermocouple. The pilot flame when lit is nice and correctly hitting the thermocouple. But it slowly loses flame a… read more
HVAC Guru
HVAC Guru
Service Technician
Associate Degree
682 satisfied customers
I have a Lennox furnace and a problem with it. I need the
hi.....I have a Lennox furnace and a problem with it. I need the control circuit board. Where can I get that? … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I have an old 1950's model Lennox furnace. It has been
I have an old 1950's model Lennox furnace. It has been turned off for months at the thermostat. The fan came on on its own, and I can't turn it off. Unfortunately it is not on a separate breaker, so t… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Sorry for the delay, i have a Lennox furnace and ac unit in
i have a Lennox furnace and ac unit in my condo, and the problem started over 2 years ago. The ac unit works fine, but after a cooling cycle the unit makes a loud noise of variable lengths and noise. … read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
I have a Lennox furnace mod. G40UH-35A-070-11 another
I have a Lennox furnace mod. G40UH-35A-070-11 another technician replaced the circuit board, but it didn't fix the problem. So I went to to the Lennox store to get the right circuit board and they got… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Where is the fuse in my Lennox furnace. I have a fuse from
I have a fuse from the last time this happened, can I do it myself? … read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I had a technician tell me yesterday my Lennox Furnace G71
I had a technician tell me yesterday my Lennox Furnace G71 MPP Series had an A4 error code, but he didn't know what that meant! Before I call for a $400 service call, is this something I should be con… read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
My Lennox furnace will not turn on, I changed the filters a
The model is CX34 .. one of the status lights blinks red and then stops… read more
gmac2905
gmac2905
hvac tech
Vocational, Technical or Trade Scho
18 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