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Lennox Conservator G8E Short Cycling

As the problem states, I have a Lennox Conservator G8E natural gas model that recently started short cycling. Furnace fires up, heats up the heat exchanger, fan starts, runs for about 15-20 seconds, and shuts down. The thermostat isn't satisfied and it waits about 60 seconds and does it all over again until the therm is satisfied. So I was wondering if anyone had wiring diagrams that could point me in the right direction for checking the limit switches on the Lennox Conservator G8E. Thanks for your time.

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  • carl carpenter
    carl carpenter May 11, 2010

    check your ground to the unit also you may want to try to clean the metal rod that is located by the burners this is your flame sensor

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Posted on May 22, 2010

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I have a new Delonghi portable AC PAC N115EC (11,500BTU), is it normal for the compressor in this particular A/C to be cycling on/off every 2 to 3 minutes?


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https://www.youtube.com/watch?v=3LBut8fWcw8
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When the gas furnace short cycles, and it does not bring the structure up ... have a frazier Johnson furnace with 9 blinks on diagnostic light. just ...

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Our Lennox Conservator G8E furnace goes through several ON-OFF cycles (we counted up to 10 clicks) before it stabilizes and stays ON. Once it's ON it works fine. - Any suggestions?


If its a gas furnace it could be the heat sensor on the pilot flame unit. When the sensor is failing it stops telling the control that the pilot is lit properly and the furnace goes thru another start up sequence.
You can try to scrape any flash and dirt off of the heat sensor rod to clean it or remove it and clean or replace the sensor or the pilot assembly. There are plenty or furnace parts on Amazon. The next most likely thing is the relay board is ready to fail that part is ~$80 but you need to get the part number right and be experienced with wiring.
WARNING-DANGER B4 you do anything to your furnace Turn Off The POWER first! If there is no plug or switch near by, shut of the circuit breaker! If you don't know what any of this means then you are likely not a good choice to mess with this device
Be Safe :)

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