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-   -   Lennox 80MGF high limit keeps tripping after 1minute (http://www.diychatroom.com/f17/lennox-80mgf-high-limit-keeps-tripping-after-1minute-162430/)

jevon77 11-06-2012 08:01 PM

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

yuri 11-06-2012 08:17 PM

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).

jevon77 11-06-2012 08:27 PM

The fan does not run when turned to on position.

yuri 11-06-2012 09:17 PM

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


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