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Lennox Conservator III G16, Furnace, Burners stay lite for 90 seconds; no blower; but exhaust fan runs continuous. If I use a jumper from the white heat wire (including white heat wire) to the green blower wire terminal (removed the green thermostat wire) the blower fan runs (non-stop) & igniter & burners restart every 10 mins. when I remove the jumper (& wire to specs from the thermostat to the furnace) igniter & burners kick on for 90 seconds then nothing on the unit works except the exhaust fan which runs non-stop. In order to reignite the furnace I have to turn the thermostat heat switch off then on again. Can anyone tell how to troubleshoot this problem(s)?

Posted by Anonymous on

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

JetJedi221
  • 25 Answers

SOURCE: The furnace burners won't stay lit

Could be a couple things. First and easiest is to check your intake combustion air supply. If it is blocked by anything or just not enough flow, it will put out the flame. Next would be the flame sensor, usually a temperature probe near the flame front. If it's not reading an increase in temp within a pre-programmed time, it will kill the flame. It can be checked with a multimeter.

Good luck!

Posted on Jan 25, 2008

wbwill
  • 68 Answers

SOURCE: Carrier Weathermaker SX model 58SX060-CC Blower runs all the time

Remove all power from the furnace, it is likely the brain in the furnace is need of being reset, from the battery replacement, why did you change the battery, was there an indicator telling you to change it?

Many times just removing all the power to the furnace will do the trick with a reset, if not let me know and we will go from there, but it sounds like the main brain is confused or bad, more likely confused, so try the power removed first.

Than let me know wbwill@sbcglobal.net

Posted on Nov 22, 2008

  • 2 Answers

SOURCE: Rheem gas furnace pilot lights, but no burners or fan

If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

Posted on Jan 06, 2009

  • 2920 Answers

SOURCE: Furnace fires for 10 seconds then cuts off

have the thermocoupler checked

Posted on Jan 17, 2009

  • 1 Answer

SOURCE: Why Wont My Bryant Furnace Stay Running

You have a dirty flame sensor, it needs to be replaced

Posted on May 03, 2009

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