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Old 02-22-2012, 02:07 PM   #1
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lennox elite series blower runs but no heat?


error code is left flashes slowly and right is on. 2 stage system i believe. id fan never gets power to it. all roll outs closed. There is a brown square plate with 2 prongs for the push on connectors which conect to roll outs. this brown square device is open. it is in a tight spot. i did not remove it. Is this my problem and what is this device. it is located behind the main gas valve and below the chamber.

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Old 02-22-2012, 02:51 PM   #2
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lennox elite series blower runs but no heat?


probably the high limit cutout switch which may be blown from poor airflow. post the complete model # of the furnace and pics of it with both doors off. error code should be on the back of one of the doors. cozyparts.com for lennox stuff

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Old 02-22-2012, 03:05 PM   #3
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lennox elite series blower runs but no heat?


High limit is mounted to the wall under heat exchanger and behind main gas valve? I am not at furnace anymore and these are the only pics I have. Thank you for taking the time to answer me.lennox elite series blower runs but no heat?-photo049.jpglennox elite series blower runs but no heat?-photo050.jpglennox elite series blower runs but no heat?-photo051.jpg
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Old 02-22-2012, 03:35 PM   #4
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lennox elite series blower runs but no heat?


That brown part behind the gas valve is the limit and it's supposed to be closed. You can remove it and gently tap on the sensing end to try and reset. That usually works to get the heat back on but once they stick open I never trust them again and order a new limit.

PS not to sound like your dad or anything but changing the filter once a month will keep those parts from breaking.
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Old 02-22-2012, 03:38 PM   #5
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lennox elite series blower runs but no heat?


those pics are of the ac coil but the furnace looks like a G51 single stage and yes the limit control is above the burners by the gas valve. will have a number on it like L185-30F which is 185 deg cutout. the error code is on the back of one of the doors.
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Old 02-22-2012, 03:44 PM   #6
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lennox elite series blower runs but no heat?


Thanks Yuri and Marty. I was on the right track but not enough fuel to get there! Rein
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Old 02-22-2012, 04:03 PM   #7
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lennox elite series blower runs but no heat?


Don't even think about jumpering that limit out if tapping the end doesn't reset it. Not worth burning the house down if the blower fails.
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Old 02-22-2012, 04:07 PM   #8
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lennox elite series blower runs but no heat?


not me. im cautoius
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Old 02-22-2012, 04:12 PM   #9
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lennox elite series blower runs but no heat?


I would tap it ONLY to get the heat on and replace it the next day. It is a bi-metal switch and may fail to open in the future after tapping it. Then the house burns down. Make sure you pay attention to the orientation picture and replace it exactly as you took it out and not flip it upside down or it won't open properly.

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