HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

I have an old Lennox elite series gas furnace from 1985-90.

Customer Question
I have an old...

I have an old Lennox elite series gas furnace from 1985-90. When it turns on, it runs for maybe a minute and then shuts off, even if the thermostat is signalling for more heat. Any suggestions are welcome. Thanks!

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

I think they are both okay, but I will get new filter.

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

If possible

Submitted: 4 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 4 hours by:
12/29/2017
HVAC Technician: gotoman for ac, HVAC Technician replied 4 months ago
gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5,335
Experience: 51 years of experience install design and repair of all makes and models of AC
Verified

Russ here. Does he fan turn on. Russ

Ask Your Own HVAC Question
Customer reply replied 4 months ago
the fan turns on when the furnace fires up. If the furnace doesn't turn on when it's supposed to based on thermostat, it seems to reset by turning furnace wall switch off for a few minutes. Then when switched back on, furnace works okay for several hours or even days.
HVAC Technician: gotoman for ac, HVAC Technician replied 4 months ago

Ok. On the furnace check to see if you have a furnace board in blower compartment. Really need the model number.Russ

Ask Your Own HVAC Question
HVAC Technician: gotoman for ac, HVAC Technician replied 4 months ago

That is furnace board. The bot***** *****ghts should be lit. Russ

Ask Your Own HVAC Question
Customer reply replied 4 months ago
Both are currently flashing while heat is working.
HVAC Technician: gotoman for ac, HVAC Technician replied 4 months ago

The furnace door has to be closed for them to light

Ask Your Own HVAC Question
Customer reply replied 4 months ago
True. But what do I do when it stops working again?l?l
HVAC Technician: gotoman for ac, HVAC Technician replied 4 months ago

Does the furnace fir and wirk.

Ask Your Own HVAC Question
Customer reply replied 4 months ago
I have already explained the problem in some detail if you look at my previous comments. Currently, the furnace is working properly. But 6 times in the past few days, it has stopped working while the temp in the house drops significantly. At those times, I restarted the furnace by turning off the furnace wall switch for several minutes and then flipped the switch on again. So far, each time the furnace started working but later fails at random times.
HVAC Technician: gotoman for ac, HVAC Technician replied 4 months ago

Opt out.

Ask Your Own HVAC Question
Was this answer helpful?
Ask Phil Your Own Question
Phil
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6,938
6,938 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

6,938 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 a Ruud achiever Super quiet 80 which runs the heat upstairs...
I have a Ruud achiever Super quiet 80 which runs the heat upstairs... thermostat tells it to turn on but all we're getting is cold air blown thru the up stairs. Basically it won't ignite. I installed … read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
I have a Trane XL 80. Error codes is flashing 4 times, which
I have a Trane XL 80. Error codes is flashing 4 times, which I believe is "Open High Temperature Limit Device." Furnace runs and circulates air, but no heat. What do I do to fix it?… read more
Shane D
Shane D
HVAC Service Manager
32 satisfied customers
The furnace will not turn on it is just humming,it is a GH
The furnace will not turn on it is just humming,it is a GH60-100S-1… read more
Tim H
Tim H
Lead building engineer
Vocational, Technical or Trade Scho
1,922 satisfied customers
My honeywell Thermostat went black I opened it but I do not
My honeywell Thermostat went black I opened it but I do not see the batterie … read more
Phil
Phil
Mechanical Engineer
6,938 satisfied customers
We have a H8neyeell FicusORO TH6320R. Same problem. Flashing
We have a H8neyeell FicusORO TH6320R. Same problem. Flashing No Signal. Have replaced batteries. Next ?… read more
Chris Wagner
Chris Wagner
None
27 satisfied customers
Lennox 80uhg where is the error lights on the control board?
lennox 80uhg where is the error lights on the control board? … read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,808 satisfied customers
Nest thermostat is giving error 74, no power to the RH
Nest thermostat is giving error 74, no power to the RH cord... we've done all the troubleshooting suggested by Nest... how can we fix it?… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I replaced my thermostat with a new Honeywell one it is
Good morning I replaced my thermostat with a new Honeywell one it is having the same issues the thermostat doesn't come on in the morning...and we need to shut off the heat (via the thermostat) and tu… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,808 satisfied customers
I have an old Lennox elite series gas furnace from 1985-90.
I have an old Lennox elite series gas furnace from 1985-90. When it turns on, it runs for maybe a minute and then shuts off, even if the thermostat is signalling for more heat. Any suggestions are wel… read more
gotoman for ac
gotoman for ac
HVAC Technician
5,335 satisfied customers
I have a Lennox Model CH33-36A-2F that stoppped working.
I have a Lennox Model CH33-36A-2F that stoppped working. Both led lights are off, the fuse is good, and when i press the door switch, i hear a slight hum. … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
I have a furnace mod. #cmf80-po, it runs for awhile then
I have a miller furnace mod. #cmf80-po, it runs for awhile then starts kicking off and on and I'm having problems getting anyone to work on it. … read more
Rick the plumber
Rick the plumber
Owner
9,857 satisfied customers
Natural gas furnace: Conquest 80 Circuit board: Honeywell
Natural gas furnace: Conquest 80 Circuit board: Honeywell S9200U1000 Universal Hot Surface Ignition Integrated Furnace Controlfurnace shut of itself after around every 20 minutes, although still under… read more
Gaztech
Gaztech
Technician
Vocational, Technical or Trade School
1,808 satisfied customers
Code on Norddyne furnace shows one hour lock out. How do I fix it?
Have a Norddyne furnace. Code shows one hour lock out. How do I fix it? Furnace's filters are clean and had a tech clean the flame sensor. Still does it. They are trying to rip me off on parts. It was… read more
Airheatman
Airheatman
Heating & Air Conditioning Contractor
6 years college
1,836 satisfied customers
Trane XV95 furnace will not run and does not send power to
Trane XV95 furnace will not run and does not send power to the thermostat... Green Led blinking once per minute... Red LED blinking once per 20 sec... What is holding out the system from powering up a… read more
Mark Henley
Mark Henley
HVAC Controls DDC
3,209 satisfied customers
Tappan furnace red fault lite is blinking
My tappan furnace model #FGRRA096C-16B red fault lite is blinking 1 time but its not lighting and the fan continues to run.… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
I have a red light on my furnace and it wont light. Why
I have a red light on my furnace and it won't light. Why?… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
I have a miller gas / propane trailer furnace. lately the furnace
I have a miller gas / propane trailer furnace. lately the furnace will stop heating. when i get to furnace the burner motor is running but no heat. When i open the furnace door the motor stops as it s… read more
A-1 Tech
A-1 Tech
Service Manager
Vocational, Technical or Trade Scho
361 satisfied customers
Trane xv95 will not fire, solid red ad green immediately after
Trane xv95 will not fire, solid red ad green immediately after reboot which indicates blown fuse or internal error. I've checked the one fuse i could find on the control board but no luck… read more
Wvfan79
Wvfan79
Mecanical Designer & Estimator
High School or GED
775 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