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Old 12-16-2009, 02:20 PM   #1
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Carrier Weather Make 8000 58DLA Problem


My son has a Carrier Weathermaker 8000 furnace, model 58DLA090-14. It has four burners. It is used in conjunction with a heat pump. The heat pump provides heat OK until the outside temp drops below the threshold that automatically switches over to the furnace. The cycle starts and runs OK until ignition time. The inducer motor comes up to speed, igniter turns red hot, the gas is turned on and the burner on the left side where the igniter is located will ignite but the three other burners will not ignite. After about two or three seconds, the gas is shut off and the cycle starts again (pre-purge, igniter red hot, left burner ignite, two or three seconds and flameout). This occurs four times (as advertised) and code 33 is flashed on the LED and lockout occurs. By turning off the power and turning it back on, it repeats the above. After several power ON/Power OFFs, all four burners will ignite and the furnace will run smoothly. I assume that the burner on the extreme right where the flame-provided-sensor is located must be burning in order for the flame-provided sensor not to go into Ignition-Lockout. The furnace acts the same when the thermostat is in the Emergency position. What are some possible causes and some suggested fixes?


Last edited by hobbsje; 12-16-2009 at 02:25 PM.
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Old 12-16-2009, 03:11 PM   #2
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Carrier Weather Make 8000 58DLA Problem


You are correct that the flame must cross all the burners and hit the flame sensor. After so many attempts the furnace will lock out. Take the burners out and clean them and the little raceway (crossovers)on the front of the burners. They must be free of dust, dirt, rust, spider webs or anything else that can interfere with the gas flow.

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Old 12-16-2009, 04:07 PM   #3
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Carrier Weather Make 8000 58DLA Problem


Marty S.

Thanks for your reply. The son and I will attempt to clean as you recommend when we can get time. Will let you know the results.

John
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Old 12-16-2009, 09:15 PM   #4
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Carrier Weather Make 8000 58DLA Problem


Clean that flame sensor also while you have it apart.
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Old 12-29-2009, 02:55 PM   #5
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Carrier Weather Make 8000 58DLA Problem


Marty S.

Thanks to your input the son and I removed the burners and cleaned them and the flame sensor. However, we did not clean out the flame carryover gap. We didn't know what it was or where it was. The furnace still didn't work correctly. After some more research on the internet we were able to identify it, cleaned it and now it works. As good as the documentation I had on that specific furnace, it did not identify the carryover gap.

Thanks again.

John
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Old 12-29-2009, 04:36 PM   #6
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Carrier Weather Make 8000 58DLA Problem


Good to hear! Now take part of that $100 service call you didn't have to spend and donate it to your favorite charity.
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Old 12-29-2009, 10:41 PM   #7
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Carrier Weather Make 8000 58DLA Problem


I already have. Thanks again.

John

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