Code 65
Rinnai Water Control Valve Fault

Unit displays Code 65 and may not respond correctly to water flow changes

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Defective water control valve, Stuck valve due to scale, Loose or damaged wiring to water valve, Control board output failure

How to Fix / Troubleshooting

Safety first: Turn OFF power and close water isolation valves. Relieve pressure before removing any water components.

Steps to check:

  • Inspect wiring: Ensure the water control valve connector is secure and wiring is undamaged.
  • Check for scale: If water is hard and maintenance has been neglected, the valve may be scaled. Professional descaling of the unit is recommended.
  • Reset and test: Restore water, power, and gas, then reset the unit.

When to call a professional: A technician should test and, if necessary, replace the water control valve assembly and verify proper modulation.

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Repair Difficulty

Hard 4/5

Required Part

Water Control Valve
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