Noritz Error Code 65: Main Flow Control Valve Abnormality
Warning: Your Noritz water heater is experiencing an issue with its main flow control valve. It's safe to use, but needs professional attention.
How to Fix Noritz Code 65
- Check if the error code is still displayed after turning the unit off and then back on again
- If the code persists, turn off the water heater and contact a licensed HVAC technician for repair
- Do not attempt to open the unit or repair the flow control valve yourself, as this can void the warranty and may cause safety hazards
How to Reset Noritz Code 65
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
What does 65 mean?
The Noritz 65 error code indicates an abnormality with the main flow control valve in your tankless water heater. This valve regulates the flow of water through the system. When it's not working properly, your water heater may not function as efficiently as it should. The error code is displayed on the control panel, and the unit will operate at a reduced capacity until the issue is resolved.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Flow Control Valve | NOR-123456 | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| 10 | Flame Failure | Warning |
| 11 | Ignition Failure | Warning |
| 14 | Thermal Fuse Failure | Warning |
| 29 | Condensate Drain Issue | Warning |
| 31 | Inlet Thermistor Failure | Warning |
| 32 | Outlet Thermistor Failure | Warning |
| 33 | Heat Exchanger Thermistor Failure | Warning |
| 43 | Water Level/Neutralizer Issue | Warning |
| 45 | Water Leak Detected | Warning |
| 51 | Fan Motor Failure | Warning |