From https://www.justanswer.com/ythi
JustAnswer Customer: i have an error code 271 on my lennox display screen
Pearl Wilson: Assistant: How old is the appliance?
Pearl Wilson: Assistant: Have you gotten error messages before?
JustAnswer Customer: 3 years old.
JustAnswer Customer: Had a service call last year and he showed me how to re set the furnace but I don't remember the code number.
Pearl Wilson: Assistant: Do you plan on doing the work yourself?
JustAnswer Customer: no
Pearl Wilson: Assistant: Anything else we should know to help you best?
JustAnswer Customer: We had an error code earlier today (about an hour ago) of 223 and I reset the furnace then this 271 code came up.
JustAnswer Customer: That's when I got on line.
Rick: HVAC Supervisor: Welcome to Just Answer, my name is * * I will do my best to help you with your issue.
Rick: HVAC Supervisor: If my initial response doesn’t answer your question then let me know and we can continue our conversation.
Rick: HVAC Supervisor: Please be patient it can take a few minutes for me to respond.
Rick: HVAC Supervisor: Both these errors refer to a draft pressure problem.
Rick: HVAC Supervisor: The most common cause of this issue this time of year is a blocked exhaust vent or air intake.
Rick: HVAC Supervisor: Insects and other critters often build a nest in the exhaust or intake over the Summer.
Rick: HVAC Supervisor: Making sure these are not blocked is the first thing to do.
Pearl Wilson: Assistant: If you have a home improvement or appliance question and want to chat with an expert now visit justanswer.com/ythi