Rinnai Error Code 65: Water Flow Control Valve
Warning: Your Rinnai water heater is locked out due to a water flow issue. It's safe, but needs professional attention.
How to Fix Rinnai Code 65
- Step 1: Turn off the power to your water heater at the circuit breaker for safety.
- Step 2: Check if the water pressure is within the correct range (20-80 PSI). If not, adjust it or call a plumber.
- Step 3: Call a professional HVAC technician to diagnose and fix the issue.
How to Reset Rinnai 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.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Rinnai Error Code 65 Mean?
Error code 65 on your Rinnai water heater indicates a problem with the water flow control valve. This valve ensures water flows at the correct rate for heating. If it's not working properly, your heater may not function or could overheat, leading to a lockout. This is a yellow hazard level as it's safe to use your heater, but it needs to be fixed by a professional.
Common Causes
- Faulty water flow control valve
- Clogged or restricted water inlet or outlet
- Incorrect water pressure
- Wiring or electrical issues with the valve
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Heater is locked out | Water pressure at the inlet | 20-80 PSI |
| Water pressure is within range | Flow control valve for continuity | No continuity (open) or continuity (closed) |
Applicable Rinnai Models
- CU(gas)
- HE(dual_fuel)
- HE++ Series(gas)
- I-SERIES(gas)
- NCB(gas)
- NPE(gas)
- RE(gas)
- REP(gas)
- RL(gas)
- RU(gas)
- RUCS(gas)
- RX(gas)
- RXP(gas)
- Rinnai NCB Series(gas)
- Rinnai NPE Series(gas)
- Rinnai R Series(gas)
- Rinnai RL Series(natural_gas)
- Rinnai RU Series(natural_gas)
- Rinnai RUR Series(gas)
- Rinnai VSP(gas)
- V(gas)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Water Flow Control Valve | RIN-1000000000000 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Rinnai model families as 65.
| Code | Description | Severity |
|---|---|---|
| 02 | Stagnant Water Detection | Warning |
| 10 | Air Supply/Exhaust Blockage | Warning |
| 11 | No Ignition | Warning |
| 12 | Flame Failure | Warning |
| 14 | Thermal Fuse | Warning |
| 16 | Over-Temperature | Warning |
| 19 | Electrical Grounding | Warning |
| 25 | Condensate Overflow | Warning |
| 29 | Condensate Neutralizer | Warning |
| 31 | Inlet Thermistor Failure | Warning |