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The 33 error means a limit has opened. We must determine which one and if limit is bad or there is a problem that made it open.Do you know where the limits are on furnace?
Below is a photo of our furnace guts...Can you direct us?
Here is one limit with arrow point to it. Remove wires and connect them together to see if error code will go away. Then if not step back and take a picture of burner area and I will point out rollout limts.