Intermittent shutdowns with Code 19; unit may restart after cycling power
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker before opening the unit. Do not modify electrical wiring if you are not qualified.
Steps to check:
- Verify dedicated circuit: Ensure the Rinnai unit is on a properly sized, dedicated circuit as specified in the manual.
- Check ground connection: With power off, remove the front cover and confirm the ground wire is securely attached to the chassis and terminal block.
- Inspect wiring: Look for loose, burned, or damaged wires at the power terminal block and control board connectors.
- Monitor voltage: If you have a multimeter and are qualified, verify supply voltage is within the range specified by Rinnai.
When to call a professional: Persistent Code 19 indicates a need for an electrician or Rinnai technician to evaluate the electrical supply and possibly replace the control board.
Repair Difficulty
Required Part
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