Rheem Water Heater Error Code 65: How to Fix It

Q: What causes Rheem error code 65 on tankless water heaters?

Error code 65 is typically caused by a malfunctioning water flow control valve, clogged inlet filters, low water pressure, electrical connection issues, or valve sensor failure that prevents proper flow detection.

Q: Can I still use my Rheem water heater with error code 65?

No, you should not use your water heater with error code 65 active. This error indicates a flow control issue that can prevent proper operation and may cause damage to the unit if ignored.

Q: How much does it cost to fix Rheem error code 65?

Repair costs vary from $0 for simple filter cleaning to $200-400 for professional flow control valve replacement. Most issues can be resolved with basic maintenance, but valve replacement requires professional service.

Q: Is Rheem error code 65 covered under warranty?

Flow control valve malfunctions may be covered under your Rheem warranty if the unit is still within the warranty period and the issue isn't due to improper installation, maintenance neglect, or water quality problems.

Q: How do I prevent Rheem error code 65 from happening again?

Regular maintenance including cleaning inlet filters every 6 months, maintaining proper water pressure, annual professional inspections, and using a water softener in hard water areas can help prevent flow control valve issues.

Abstract

Rheem water heater error code 65 indicates a malfunction with the water flow control valve, which regulates water flow through your tankless unit. This is a high-severity error that can prevent your water heater from operating properly and may require immediate attention to restore hot water service.