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lennox heater shuts off

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My Lennox heater starts up fine runs for about 4 to 5 mins. then the burners shut off.Everything else stays

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  #1 (permalink)  
Old 01-24-2011, 12:36 PM
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Default lennox heater shuts off
Model Number: G50DF{X}   Brand: -other-   Age: 5 - 10 years   

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My Lennox heater starts up fine runs for about 4 to 5 mins. then the burners shut off.Everything else stays running except the burners.The front panel lights up a open rollout switch which I replaced hoping that was the problem.But that did not fix it.HELP PLEASE


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  #2 (permalink)  
Old 01-24-2011, 12:38 PM
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keeps blowing air
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Old 01-27-2011, 10:28 AM
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It could be that the sensor in the heat exchanger is the problem. Some units have several heat sensors with or without a reset.

When the unit shuts down, disconnect each sensor and ohm them out before they cool down - if you get a reading across all the ones you checked then the problem is elswhere - could be in the board.

SteveKJR


Quote:
Originally Posted by giantsfan View Post
My Lennox heater starts up fine runs for about 4 to 5 mins. then the burners shut off.Everything else stays running except the burners.The front panel lights up a open rollout switch which I replaced hoping that was the problem.But that did not fix it.HELP PLEASE
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Old 01-27-2011, 12:41 PM
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Well come to find out what was wrong with my unit was that the installer built a box in my attic for a filter for my unit.Why they would do something so stupid is beyond me.I had to air draw to my unit come to find out so I started checking my ducts to see if the came loose or became torn by something.Come to find out when I started looking around I found the box with the filter and took it out and relocated it to a more convient place to get to change.
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Old 01-27-2011, 01:51 PM
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So, it sounds like the high limit was doing the job - the filter caused an air flow problem by reducing airflow across the heat excahnger (that is if the filter you found was completely clogged up). As a result, the temperature in the heat exchanger exceeded the temp on the sensor and the unit shut down.

Good find. Keep an eye on those filters - they can cause problems.

SteveKJR




Quote:
Originally Posted by giantsfan View Post
Well come to find out what was wrong with my unit was that the installer built a box in my attic for a filter for my unit.Why they would do something so stupid is beyond me.I had to air draw to my unit come to find out so I started checking my ducts to see if the came loose or became torn by something.Come to find out when I started looking around I found the box with the filter and took it out and relocated it to a more convient place to get to change.
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