HVAC

Have HVAC questions? Ask an HVAC Expert for answers

Ask an Expert,
Get an Answer ASAP!

Lennox G26Q4/5-100-1 furnace does not light the pilot light…

Customer Question
Lennox G26Q4/5-100-1 furnace does...

Lennox G26Q4/5-100-1 furnace does not light the pilot light or make any kind of spark, changed out the intermittent spark control unit, no help... thinking maybe the gas valve is not responding to the controller input

Contractor's Assistant: Did you check the furnace's filters?

Yes

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

Yes

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

The combustion fan runs fine and the switch works because the control unit powers up, the overheat switch is functioning

Submitted: 9 months ago.Category: HVAC
Show More
Show Less
Ask Your Own HVAC Question
Answered in 6 minutes by:
11/2/2017
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 24,574
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. What is the flash sequence on the control board LED's

Ask Your Own HVAC Question
Customer reply replied 9 months ago
There is an led that comes on when the combustion fan sensor gets actuated, it then is steady for 85seconds while it try’s to light the pilot light with an electronic spark, if the pilot lights, the pilot sensor sends signal, the main gas valve opens and the furnace lights off and runs, if that does not happen, the control goes into a blinking led light ... for an hr then it will try again... my led light does this.
Customer reply replied 9 months ago
I hear no spark, I smell no gas
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

Service manual for this model shows HSI (hot surface igniter) not pilot with igition electrode. Your assumption that the draft switch is functioing is questionable. Try this, wait until the draft fan starts up then jump the 2 leads on the draft switch. Does the igniter initialize?

Ask Your Own HVAC Question
Customer reply replied 9 months ago
Since I am looking at the unit and it is NOT a HSI system, it seems questionable that I should do what you ask... you may be giving me bad info based on a different system. I believe the draft switch is working because until the switch actuated there is no led light on the ignition module. Response?
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

All I said was that's what the manual shows. Draft presure switch function is standard no matter the ignition type. Can you provide a clear pic of the wiring diagram of this unit?

Click on the link below for info on posting pics here

http://ww2.justanswer.com/help/how-do-i-send-photo-or-file-expert-hl

Ask Your Own HVAC Question
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

Neither one is the wiring diagram. It's usually pasted to the bcak of the blower compartment access panel. Did you try jumping out the draft switch? do you have a multi-meter?

Ask Your Own HVAC Question
Customer reply replied 9 months ago
I am not currently in front of the furnace, all I have with me were those photos. Yes I have a multi meter (and know how to use it) but until we are on the same make and model number I don’t think you can help me
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

I can't help without a wiring diagram. There is brief mention of your config at the end of the manual but no wiring diagram. I also can't help you unless you're onsite

Ask Your Own HVAC Question
Customer reply replied 9 months ago
Good bye
HVAC Technician: Rick, HVAC Supervisor replied 9 months ago

bye

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 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
Is the Lennox g20 whisper heat suppose to bring the furnace
Is the Lennox g20 whisper heat suppose to bring the furnace on and off while the blower continues to blow?… read more
Appliance Guru
Appliance Guru
18,199 satisfied customers
I have a Lennox G26Q4/5-125-1 gas furnace. Unit calls for heat,
I have a Lennox G26Q4/5-125-1 gas furnace. Unit calls for heat, sequences but does not light. I tried it several times after and it lit off just fine.… read more
Appliance Guru
Appliance Guru
18,199 satisfied customers
can the bearings on a lennox hm30-100 combustion motor be changed and if so what do you do
can the bearings on a lennox hm30-100 combustion motor be changed and if so what do you do? the combustion motor makes a loud sound like the fan wheel is out of balance or the bearings might be bad.… read more
Phil
Phil
Mechanical Engineer
Degree, Mech Engr Technology
7,426 satisfied customers
My Lennox Furnace model # ***** 4E 100-2 has a pilot light
My Lennox Furnace model # ***** 4E 100-2 has a pilot light problem. The pilot light does not go out after the furnace finishes it's heat cycle. Then, it won't start the next time when heat is called f… read more
Appliance Guru
Appliance Guru
18,199 satisfied customers
My furnace would only run if it was switched off and turned
My furnace would only run if it was switched off and turned back on, once the set temperature was reached it would stop and not start when the thermostat dropped well below the set temperature. I repl… read more
Tim H.
Tim H.
Lead building engineer
Vocational, Technical or Trade Scho
3,962 satisfied customers
I have a Lennox Heat Pump with backup gas heat unit (G23).
I have a Lennox Heat Pump with backup gas heat unit (G23). The unit has a G77 Intermittant Pilot Ignition Control module and a White Rogers 36E Gas Valve. Overnight, the furnace has stopped working; i… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
lennox g11e-110v-4 no spark. if I hold a lighter to pilot,
lennox g11e-110v-4 no spark. if I hold a lighter to pilot, pilot lights, and burners light. no power at spark terminal on ignition module that's attached to gas valve. lennox says ignition module disc… read more
MRANSWER
MRANSWER
TECHNICIAN
Bachelor\u0027s Degree
6,158 satisfied customers
Need a wiring diagram for a Lennox mid-efficient furnace with
Need a wiring diagram for a Lennox mid-efficient furnace with intermittent spark pilot . Model # XXXXX XXXXX , S/N is 6385K 78322 . The original control was part of the gas valve . The replacement kit… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Hi I have a Lennox Furnace G11Q3-137 V-1, ser.# XXXXX Has
Hi: I have a Lennox Furnace G11Q3-137 V-1, ser.# XXXXX Has been working fine. Quit heating last night, pilot is on, fan is working, but will not light burners? Is this something I can repair myself? I… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
I have a 1992 Bryant 394GAZ024050 50,000 BTU gas furnace that
I have a 1992 Bryant 394GAZ024050 50,000 BTU gas furnace that the pilot doesn't always ignite. The ignitor and pilot assembly have been replaced. When the furnace times out, the ignitor is clicking an… read more
Tim H.
Tim H.
Lead building engineer
Vocational, Technical or Trade Scho
3,962 satisfied customers
MY furnace is a coleman evcon model 7995C856. The problem is
MY furnace is a coleman evcon model 7995C856. The problem is the burner won't stay lit after the furnace calls for heat. The pilot light and the burner both go out after about 30 seconds. It looks lik… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,010 satisfied customers
I have Lennox Whisperheat furnace which is about 16 years old.
I have Lennox Whisperheat furnace which is about 16 years old. I am starting the furnace for the forst time since taking up occupancy. The gas valve and the fan motor do not operate. The ignitor works… read more
Tim H.
Tim H.
Lead building engineer
Vocational, Technical or Trade Scho
3,962 satisfied customers
I have an older amana furnace and the pilot light starts up
I have an older amana furnace and the pilot light starts up fine after the thermostat triggers it but it takes a long time for the burners to light, if they do. Its it an ignitor problem or is it a pr… read more
Regan Land
Regan Land
General Manager
Vocational, Technical or Trade Scho
508 satisfied customers
We have a G23 Lennox gas furnace, s/n 5896L22537. the pilot
We have a G23 Lennox gas furnace, s/n 5896L22537. the pilot light operates intermittently. the thermostat which is new is at 65 and the furnace is set for 70.… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
What electrical power does the Lennox G8 gas furnace require
What electrical power does the Lennox G8 gas furnace require and what are the connections?… read more
Billy
Billy
Journeyman Service Technician
State Licensed Mechanical Contractor
9,330 satisfied customers
Furnace clicks but no gas to the pilot or burners Lennox Model
Furnace clicks but no gas to the pilot or burners Lennox Model G1604-100-1 Emery Antonucci [email protected]… read more
Rick
Rick
HVAC Supervisor
24,574 satisfied customers
The electronic ignition on my Rheem Quiet 80 furnace does not
The electronic ignition on my Rheem Quiet 80 furnace does not trigger. I have two identical furnaces. I tested the other and it works fine. On the functional unit, I can view the flame from the view w… read more
Rick
Rick
HVAC Supervisor
24,574 satisfied customers
Hi, I have a armstrong furnace and I know its outdated 1978
Hi, I have a armstrong furnace and I know it's outdated 1978 model Ultra II 97, but I'm a little tight on cash right now, so here goes. My furnace is LP feed. I have 2 new regulators, one on tank and … read more
Jim Eastwood
Jim Eastwood
Lead service
High School or GED
100 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