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That is a 33 error meaning one of the rollout thermostat around the burner area have tripped open. Can you look around the burner area for these thermostats. Most have a reset button between the two wires that go to the thermostat that you can press in to reset them and others may not. One of them is reading open so the board is displaying that error code for you. The unit has overheated and tripped one or one may just have gone bad. Also check the filter and make sure it is clear as that can cause the unit to overheat and cause them to trip.
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You can put the wires together to each one to bypass each one and try it as some may not have a reset button on them.
It cannot be the rollout as they would need a manual reset. You say it comes and goes so this means the high limit is tripping. This can be from lack of air flow such as plugged filter, dirty blower motor wheel, duct work restricted...and also Bryant/Carrier/Payne had a issue with circuit boards HK42FZ not running the blower reliably.
First we need to check any air flow issues. Then if 33 is still present we want to check the limit which is a credit card sized flat plate on the front wall of the furnace behind the gas valve. This is not a button rest..it has to cool down to close..and if stuck sometimes tapping the switch helps.
So forget the rollouts and look at the limit on front wal...and anything that can impede air flow.
If no plate then you have a oval plate with a round switch and 2 wires attached..if you see this tap it a few times and tell me if code changes