Carrier Intermittent Problem, Error 33 - HVAC - DIY Chatroom Home Improvement Forum

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Old 12-05-2010, 02:25 PM   #1
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Carrier Intermittent Problem, Error 33

I have a Carrier Cobra, Model # GB1AAV048111 furnace (original in ~1996 built house) that fails to operate intermittently, ~2x/week, error code is 33 "Limit or Flame Rollout Switch is Open". Cycling the power resets the error, and the furnace will work again for a few days until the problem is repeated.

To the best of my knowledge, this problem began with the start of the season. As a side, things different from last year include 1) my electric company company installed a new Honeywell Thermostat this summer as part of a summer energy managment program and 2) A new AC unit was installed which modified the filter enclosure to take a larger filter (the filter is brand new). I dont suspect either, but included as info just in case...

What are the troubleshooting steps to find the cause and repair?


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