Error Code 90 indicates a “Decrease in Fan Motor Ventilation” on your Rheem Continuous Flow Water Heater. This issue signifies reduced airflow, potentially caused by fan malfunction, blockage, or dirt buildup, impacting the heater’s efficiency and safe operation.
Turn off electrical power at the isolation switch immediately. Reduced fan ventilation can pose safety risks due to incomplete combustion. Do not attempt to use the unit until professionally inspected. Contact Hilton Plumbing to arrange an urgent assessment and safe resolution.
Book online or call us directly at 1300 872 343.
