Have HVAC Questions? Ask an HVAC Expert for Answers
Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.
A 33 error is an open limit error. Did you reset the rollout switch to gt it running again or does it just start back up on its own? when was the last time you replaced the filter?
Rollout looks like the attached pic. No ON/OFF just a button to push. It is just above the burners
That's the gas valve.
Yes that's the rollout. Then your issue is related to the limit control which is there to shut the furnace down if it gets too hot. One cause could be a dirty filter but you said it's changed regularly. Another possibility is a clogged AC coil if you have central AC. Another possibility is a bad limit or a bad connection. One other possibility is blocked vents in the house. So aside from changing the filter and moving the furniture away from the vents (if that's the issue) the other culprits would usually require a technician to pin down.
You might try changing the filter first.