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My lennox furnance won't kick on .

My lennox furnance GCS16R-411-100-5P all of a sudden wont kick on . we changed the thermostate and still nothing. the blower will kick on if I switch it to auto but blows out cold air. We can hear something in the unite but it won't do anything. does anyone know what it could be ?

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  • tonkasl24 Dec 14, 2008

    yes we do.

  • tonkasl24 Dec 14, 2008

    Well I can't see it if it is glowing . I have looked over the unite and can not see anything . It seems to be inside this box area. but it is a direct spark type igniter. the unit is about 15 yrs old. I do not have a meter either.

  • tonkasl24 Dec 15, 2008

    ok we just took it apart and it is not getting a spark at all ..!

  • tonkasl24 Dec 15, 2008

    ok we now have spark it was human error on are part. we think it is not getting any gas through line .

  • Amber Compa
    Amber Compa May 11, 2010

    Is this a lennox pulse?

  • Ken Bledsoe May 11, 2010

    Now that you got a spark and no gas that's not good, gas valve could be bad. You will have to get a techie to come out and check. If you had a meter we could test it and determine it's fate. Ken

  • Ken Bledsoe May 11, 2010

    The draft fan is a safety device that has to be satisfied before the spark happens. Be sure the vacuum hose is tight on the pressure switch. And tight on the draft fan. I'm suspecting the ignitor is bad. Being 15 years old and has worked perfectly up until now. Ignitor comes from the board or some device that tells it to spark.

  • Ken Bledsoe May 11, 2010

    I guess I should have asked you is it spark or hot surface. My unit is about 4 years old and I have a sparker that lights the pilot light which in turn lights the burners.

  • Ken Bledsoe May 11, 2010

    The next step would be the hot surface ignitor should start to glow how about that. And if it doesn't glow do you have volt ohm meter?

  • Ken Bledsoe May 11, 2010

    do you hear a pre fan



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Posted on Jan 02, 2017

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SOURCE: Unit will not blow cold air after starting up for first time this season

you may need to remove the rear cover to examine what is and is not running. once you remove the back, start up the unit on a workbench. see if the fan is running and the compressor has kicked in. look at the larger or two tubes coming out of the compressor. if it is cooling a small layer of frost or condensation will appear on this " suction" line. if this tubing and the other one are approx the same temperature, then there is a freon leak in the system. Only an EPA certified technician can fill your unit. I am not familiar with that RED button but it mat be a reset of some sort. With the back removed see how it is connected in the wiring circuit. if you have the wiring diagram, please send it to me under my regular email address and I'll walk you through the troubleshooting procedure.

Posted on Sep 02, 2007

  • 4 Answers

SOURCE: Amana Air Command 90 - Model GSC075A30A

water should never reach the nipple for the pressure switch tubing on the IDM. Check the entire condensate drain system for obstructions. Verify water makes it from the furnace location to the outside drain. Flush p-traps and any anti-siphon devices thoroughly.

Posted on Apr 07, 2009

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SOURCE: AC unit turns on blower doesn't come on

The thermostat is the controller.

Posted on Jun 19, 2009

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SOURCE: lennox air unit not blowing cold air

your fan motor outside is going bad, have a service company change it out for you.

the motor stopped working and that overheated the compressor shutting it down on thermal cutout, and it will only come on once it cools down

Posted on Jul 01, 2009

Sea Breeze
  • 4655 Answers

SOURCE: Will not cool properly.

You have either a faulty thermostat, dirty condenser and evaporator or a faulty run capacitor. Need to service soon before the compressor is damaged. Sea Breeze

Posted on Jul 06, 2009

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