Rheem HVAC Error Code 31: How to Fix It

Q: What does Rheem error code 31 mean?

Rheem error code 31 indicates the hi-limit safety switch has opened due to overheating caused by restricted airflow or blower motor failure. This safety feature protects your system from damage.

Q: Can I reset Rheem error code 31 myself?

Yes, you can often reset the hi-limit switch by pressing the reset button on your furnace or waiting 30 minutes for it to automatically reset. However, you must address the underlying airflow issue or the error will return.

Q: How often should I change my air filter to prevent code 31?

Change your air filter every 1-3 months depending on usage, pets, and air quality. A dirty filter is the most common cause of restricted airflow leading to error code 31.

Q: Is it safe to keep using my Rheem HVAC with error code 31?

No, do not continue operating your system with error code 31. This error indicates dangerous overheating that could damage your equipment or create safety hazards. Address the issue before resuming normal operation.

Q: What causes restricted airflow in Rheem HVAC systems?

Common causes include dirty air filters, blocked vents, closed dampers, collapsed ductwork, debris in the blower, or a failing blower motor. These issues reduce airflow and cause the system to overheat.

Abstract

Rheem HVAC error code 31 indicates a hi-limit switch has opened due to restricted airflow or blower motor failure. This safety feature shuts down your system when it overheats to prevent damage. Common causes include dirty air filters, blocked vents, or a malfunctioning blower motor.