Rheem HVAC Error Code 9: How to Fix It

Q: What does error code 9 mean on a Rheem furnace?

Error code 9 means the rollout switch is open. This safety device detects when flames are rolling out of the burner compartment, indicating a dangerous condition.

Q: Can I reset the rollout switch myself?

Yes, you can reset the rollout switch by pressing the reset button. However, if it trips again, there is an underlying problem that needs to be fixed, such as a dirty filter or blocked vent.

Q: How much does it cost to fix a Rheem error code 9?

DIY fixes like replacing an air filter or resetting the switch cost little. Professional repairs for a heat exchanger replacement can range from $500 to $2,000.

Q: Is error code 9 dangerous?

Yes, it can be. A rollout switch tripping may indicate a cracked heat exchanger, which can leak carbon monoxide. Turn off the furnace and call a professional if you suspect CO exposure.

Q: Why does my Rheem furnace keep showing error code 9?

Common causes include a dirty air filter, blocked combustion intake/exhaust, or a faulty rollout switch. If these are fine, the heat exchanger may be damaged, requiring professional replacement.

Abstract

Rheem HVAC error code 9 indicates the rollout switch is open. This is a critical safety feature that shuts down the furnace if flames roll out of the burner compartment. The most common causes are a dirty air filter, blocked combustion air intake, or a damaged heat exchanger.