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Old 11-06-2012, 08:01 PM   #1
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Lennox 80MGF high limit keeps tripping after 1minute


Then shuts off flame. It trips before blower fan comes on. We just replaced high limit sensor today. The exhaust chimney in that 1 minute that the burners are on gets really hot. Can't put your hand on it. Any help would be appreciated
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Old 11-06-2012, 08:17 PM   #2
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Lennox 80MGF high limit keeps tripping after 1minute


The circuit board may be faulty and not turning the fan on properly. Turn your fan to ON at the thermostat and see if it keeps running ( if you have AC).
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Old 11-06-2012, 08:27 PM   #3
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Lennox 80MGF high limit keeps tripping after 1minute


The fan does not run when turned to on position.
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Old 11-06-2012, 09:17 PM   #4
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Lennox 80MGF high limit keeps tripping after 1minute


Could be a bad circuit board or fan motor or motor capacitor.
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