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Joined: 1/19/2011(UTC)
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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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Rank: Member
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Joined: 1/19/2011(UTC)
Posts: 3
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Rank: Member
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Joined: 1/27/2011(UTC)
Posts: 12
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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 Originally Posted by: giantsfan  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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Rank: Member
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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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Rank: Member
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Joined: 1/27/2011(UTC)
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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 Originally Posted by: giantsfan 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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