Carrier Infinity limit switch fault #33


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Old 02-19-14, 10:32 AM
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Carrier Infinity limit switch fault #33

I have a carrier 58mvc that Iím getting a code 33. The FRS isnít tripping but the LS is, I have a humidifier application on it and with the humidifier cover and screen removed along with the air filter door removed the LS is still tripping. The combustion chamber/flame box seems to be excessively hot. I ran a function test by flipping dip switch 6 on sw1 and everything ran fine with no codes. Can anyone help I recently had both heat exchangers replaced and have had this problem since
 
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Old 02-19-14, 10:10 PM
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Is this a new thread on the same existing problem ?
 
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Old 02-20-14, 06:05 AM
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Haha no it isnít i can see where you are getting at i have been having a lot of issues the same furnace my first issue was a problem with the furnace not working at all with a yellow LED light on solid all the time which was a result of a improper ground, the electrical board only had around 13 or 14 volts where it needed at least 24. now my problem is that the furnace is getting proper voltage and running as it should but after about 5 min it will shut down throw code 33 and just run the blower till it cools off i removed the air filter and filter door along with the humidifier screen and cover eliminating the theory of restricted air flow and im still getting the same fault of 33 resulting in a final lockout of code 13 could this be a bad or cracked LS or maybe a cracked heat exchanger i did notice a light natural gas exhaust smell lastnight when the blower kicked on
 
 

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