35
Rinnai
Abnormal Flame Detection Signal
Boiler shows error 35 and will not run; may occur after electrical storms or power surges.
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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
Flame detected when there should be none, Shorted flame rod to burner, Moisture bridging flame circuit, Control PCB flame detection failure
How to Fix / Troubleshooting
Safety first: Isolate power and gas. Do not attempt to run the boiler until the cause is identified.
- Inspect flame rod and burner: Remove the front cover and visually inspect the flame rod for carbon tracking, cracks, or contact with the burner.
- Check for moisture: Look for condensation or water leaks around the burner and control board. Dry thoroughly and correct any leaks.
- Verify wiring: Ensure the flame rod lead is not touching grounded metal parts and that insulation is intact.
- Reset after drying: Once everything is dry and secure, restore power and reset the boiler. If error 35 persists, the control PCB likely needs replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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