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Thread: Lennox Furnace not kicking on unless thermostat is turned off then on

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    DIY Junior Member sharkbait's Avatar
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    Dec 2010
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    Default Lennox Furnace not kicking on unless thermostat is turned off then on

    Issues with furnace not kicking on…. I have a Lennox G12Q4E-137-7 furnace and White Rodgers Digital Comfort II thermostat. All will work fine for most of the day or into the night but then at some point it does not kick on. It usually happens at night. I had the cover off to get the model number off the furnace and it kicked on while I was looking inside. Everything looked and sounded fine to my untrained eyes and ears. Every time we are able to fix it by manually turning the thermostat to OFF, waiting 30-45 seconds and then turning it back on. I replaced the batteries in the thermostat but that did not help. I am tired of waking up cold every morning…any ideas????
    Thanks!
    Dan
    Last edited by sharkbait; 12-27-2010 at 09:04 AM. Reason: O should be Q in model number

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