Rinnai Water Heater Error Code 65: How to Fix It

Q: What causes Rinnai error code 65?

Error code 65 is caused by a malfunction in the water flow servo system, which can result from debris in the flow sensor, electrical connection issues, low water pressure, or a faulty servo motor component.

Q: Can I reset Rinnai error code 65 myself?

Yes, you can attempt a basic reset by turning off the power and gas supply for 10-15 minutes, then restarting the unit. However, if the error persists, further troubleshooting of the flow sensor and electrical connections is needed.

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

DIY cleaning and basic maintenance costs under $20. Professional service calls typically range from $150-300, while water flow sensor replacement can cost $200-400 including labor.

Q: Is Rinnai error code 65 dangerous?

The error code itself is not dangerous - it's a safety feature that shuts down the unit when flow control issues are detected. However, always follow proper safety procedures when working with gas appliances.

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

Regular maintenance including annual cleaning of the water flow sensor, maintaining proper water pressure, and keeping water lines free of debris can help prevent this error from recurring.

Abstract

Rinnai error code 65 indicates a water flow servo malfunction, which controls the gas valve operation based on water flow demand. This error prevents your water heater from properly regulating gas flow, causing it to shut down for safety reasons.