How JustAnswer Works:

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

Ask Phil Your Own Question

Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5448
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

my heater shut off of a lennox furnace I am trying to relight

Resolved Question:

my heater shut off of a lennox furnace I am trying to relight the pilot but I cant find it. The directions say to manually light the pilot while holding the red button and switch to pilot but need to know where pilot burner is???
Submitted: 4 years ago.
Category: HVAC
Expert:  Phil replied 4 years ago.

Hello, There is a 1/4" diameter aluminum tube running off the main gas valve. follow that tube.. at the end of it is the pilot light.

 

Turn the gas valve knob to 'pilot'.. depress at knob or button, hold it down while you use a long match or barbeque pit lighter to lite the pilot... KEEP HOLDING THE BUTTON DOWN for at least 60 seconds. when you let up on the button the pilot should stay lit

 

THEN carefully rotate the knob to ON,... be sure you do not pass the OFF position but go directly to ON... this will put gas to the burners if your thermostat is calling for heat.

 

Please click the 'accept' button if this helped, Phil



Edited by Phil on 3/16/2010 at 5:00 AM EST
Customer: replied 4 years ago.
okay I have turned on the pilot and it does stay lit but now the heat does not turn on. In the thermostat I have it on all the way can you help??
Customer: replied 4 years ago.
okay now the pilot is lit last step is to turn on the electric switch then turn thermostat to desired room temp. Where do I locate the eclectric switch???
Expert:  Phil replied 4 years ago.

Hmmm. That should have lit the main burner. And you say the thermostat is ON as usual... something else is killing power to the gas valve in that case. are you sure you rotated the gas valve knob back to the ON position? check that, its easy to misread the pointer.

 

Do you have an electrical tester? My guess is no... I will advise for now on how to diagnose the problem without one.

 

Try the following and get back to me:

 

Pull the plastic cover off of the thermostat, if it is an OLD thermostat, with NO mercury bulbs in it... it will have a big spring looking thing inside, attached to a tiny set of electrical contacts...those will be very low voltage as a rule...if they are low voltage take a finger nail file and clean them up,,, if the gas comes on, that was the problem.

 

If there is no such issue with the thermostat, then follow each wire (2) from the gas valve until it runs into a control of some sort, probably a high limit controller, press the red button on that baby.

 

If the furnace starts it was off on the high limit... if it goes off again on that switch it willl be a defective fan, real dirty air filter, or bad high limit switch... act accordingly.

 

Good luck, if this set of answers and diagnostic instructions helped, please click the 'accept' button. then post back if there are any other issues, I will be glad to help further, Phil



Edited by Phil on 3/16/2010 at 5:28 AM EST
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5448
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Phil and 5 other HVAC Specialists are ready to help you
Customer: replied 4 years ago.
sorry but let me see if i get this straight um the wires from the gas valve go to a like an aluminum box do i need to open that? There are only 2 wires that come from the gas valve. And is this the last step I need to do to turn on the control switch?

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. Jimmy Bagley, IA
< Last | Next >
  • 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. Jimmy Bagley, 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
< Last | Next >
  • http://ww2.justanswer.com/uploads/SE/ServiceTechRus/2012-6-7_2119_056.64x64.JPG gotoman for ac's Avatar

    gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    3888
    Retired HVAC/ Electrical & Boiler contractor. Industrial
  • http://ww2.justanswer.com/uploads/skibum0101/2008-12-16_015819_just_answer.jpg Rick Mather's Avatar

    Rick Mather

    HVAC Technician

    Satisfied Customers:

    3132
    35 years experience, HVAC
  • http://ww2.justanswer.com/uploads/RY/Rygis20/2011-5-7_3143_DSC5324.64x64.JPG Matthew's Avatar

    Matthew

    HVAC Technician

    Satisfied Customers:

    1994
    14 years experience in the HVAC field of service, installation, Manual J & D calculations
  • http://ww2.justanswer.com/uploads/KE/kentguidry/2011-9-26_214316_0059.64x64.jpg Kenton Guidry's Avatar

    Kenton Guidry

    HVAC Technician

    Satisfied Customers:

    962
    12 years install/service experience.
  • http://ww2.justanswer.com/uploads/solarman1947/2009-12-13_223915_phpkKBcXq_c2PM.jpg Rick Ridley's Avatar

    Rick Ridley

    UK Heating Engineer

    Satisfied Customers:

    871
    Retired But have had 30 years on the tools, Ex CORGI
  • http://ww2.justanswer.com/uploads/Ironheadfan/2009-12-18_222416_pump_005.jpg Tom's Avatar

    Tom

    HVAC Technician

    Satisfied Customers:

    770
    16+yrs HVAC/R service. Residential Commerical Industrial