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Old 01-31-2011, 06:06 PM   #1
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payne furnace prob


after turning on the heat the furnace combustion box overheats causing manual limit switch to go off . i have the heat set to 66 degree however it only gets to 58 degrees. the furnace exhaust gets a natural gas smell outside. the furnace gives code 33, and blower motor runs until i reset furnace it was installed 97

i replaced cleaned
cleaned intake and exhaust pipe
thermostat
air filter
replaced burned out draft inducer
last yr replaced flame sensor and flame ign.
payne furnace model #490aav036060

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Old 01-31-2011, 06:16 PM   #2
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payne furnace prob


not getting enough air flow across the HX .dirty coil. closed off vents , not enough return air

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Old 01-31-2011, 06:22 PM   #3
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i cleaned the coil
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Old 01-31-2011, 06:23 PM   #4
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all vents open air comes out
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Old 01-31-2011, 06:26 PM   #5
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payne furnace prob


Is this 1 of the small limits that you reset by pushing a small button. If so it's a roll out limit & you need to have the H X or vent system checked
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Old 01-31-2011, 06:31 PM   #6
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yes it is one of the small ones u push in did and over heated ? could u be limit switch on fire wall
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Old 01-31-2011, 06:33 PM   #7
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payne furnace prob


Quote:
Originally Posted by drisco View Post
yes it is one of the small ones u push in did and over heated ? could u be limit switch on fire wall

Can't make out what this means. You need to have a PRO check your unit
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Old 01-31-2011, 06:55 PM   #8
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payne furnace prob


. [IMG]file:///C:/DOCUME%7E1/owner/LOCALS%7E1/Temp/moz-screenshot.png[/IMG][IMG]file:///C:/DOCUME%7E1/owner/LOCALS%7E1/Temp/moz-screenshot-1.png[/IMG]one of my friends thought that the Heat exchangers, are sooted and or limit switch on fire wall behind draft inducer is at falt
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Old 01-31-2011, 08:17 PM   #9
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payne furnace prob


Your secondary heat exchanger is plugged up.

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