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Old 11-21-2011, 06:54 PM   #1
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code 33 furnace error


Hi. We have a gas furnace with a code 33. The problem is that once it calls for heat it goes on for exactly 10 min, shuts of for exactly 1 min., then back on, 10 min, 1 min, continually, until it reaches temp, which can be quite long.

Technician replaced the main computer board - didn't help. Any thoughts??

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Old 11-21-2011, 07:06 PM   #2
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code 33 furnace error


If it is a Carrier/Bryant/Payne code 33 is open limit. means that not enough air is moving thru the furnace and it is cycling on the limit control. dirty ac coil, filters,ducts, vents closed could be the problem.

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Old 11-21-2011, 07:14 PM   #3
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code 33 furnace error


checked those things, but all seem to be fine. Heres one more piece that we just figured out. It only happens when the downstairs calls for heat, not upstairs. Thermostat was already replace downstairs, as we thought that was the original problem, but still continues.
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Old 11-21-2011, 07:26 PM   #4
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code 33 furnace error


I assume you have 2 furnaces? Yes?

Remove the tstat from the problem one and pack pink fibreglass insulation in the hole behind it in the wall. You may be getting a draft thru there and aggravating the tstat.

code 33 is temp related so it has to be a problem with airflow. if they share the same return air duct then one may be overpowering the other.
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Old 11-21-2011, 07:57 PM   #5
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code 33 furnace error


Hi Yuri.
No, we have one furnace with 2 zones. Is there a door?? for zone 1 and for zone 2?
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Old 11-21-2011, 08:12 PM   #6
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code 33 furnace error


I would literally have to see your setup. In some cases they have a "barometric damper" bypass pipe from the supply plenum so the excess air that gets blocked when 1 zone/damper closes can bypass back into the return duct. if that is out of whack/sticking or not set properly that may be why it is overheating.
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Old 11-21-2011, 08:17 PM   #7
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code 33 furnace error


Okay. Thanks Yuri. We'll have to contact someone here to help with that. I appreciate your response. I'll post the outcome.
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Old 11-21-2011, 08:21 PM   #8
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code 33 furnace error


Good Luck.

Make sure you ask them if they have worked on zoned systems as they are rare and most guys don't see them or know them well. Talk to the service manager and explain what you have.

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