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Furnace error code 42

I am having an error code 42 on the bryant furnace. I ran the component test and it passed, but error code still exists. if I shut the power off and then back "on" again, 9/10 times the furnace will start again. but I am not sure what is causing this.

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  • 24 Answers

Have to know the model and serial of the furnace.
locate code list usually inside or on the back of a door.
Operation sequence= call for heat--inducer blower motor--makes pressure switch--signals board to bring on hsi--after a set time gas valve opens and you have ignition--main blower motor comes on after a set time

Posted on Mar 02, 2014

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Posted on Jan 02, 2017

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The HVAC Guy
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SOURCE: Coleman Evcon Furnace Model G8T10012UHB11A

you probably have a cracked heat exchanger which is causing the rollout switches to trip.even the tiniest of cracks will cause the fan to blow the flame back into the unit and cause them to trip. check the heat exchanger for even the tiniest of cracks if so replace it. and be sure to have a carbon monoxide alarm in your home.

Posted on Oct 30, 2008

  • 1 Answer

SOURCE: Why Wont My Bryant Furnace Stay Running

You have a dirty flame sensor, it needs to be replaced

Posted on May 03, 2009

  • 2 Answers

SOURCE: Code #33 on Bryant 355MAV 90i Furnace

'Limit or flame rollout switch is open'. In my case, the flame rollout switch had tripped due to an overheating? I had to push the button between the wire leads to reset the switch. Then when I turned the power back on, the furnace started up like normal.

Why did the switch overheat and trip? My current theory is that there was a rubber grommet around a pipe near the switch that had slid down and was no longer sealing the furnace?

Posted on Dec 21, 2009

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