70
Rinnai
Main Control PCB Fault
Boiler displays error 70 and will not operate.
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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
Internal PCB failure, Damage from power surge, Corroded PCB due to moisture, Incorrect or corrupted firmware
How to Fix / Troubleshooting
Safety first: Isolate power. Do not attempt to repair the PCB at component level.
- Inspect for moisture: Remove the front cover and check the control board area for signs of water ingress or condensation. Address any leaks before replacing components.
- Check wiring harnesses: Ensure all connectors to the PCB are fully seated and free of corrosion or burning.
- Power quality: Verify that the boiler is supplied from a stable power source. Consider installing surge protection if power quality is poor.
- PCB replacement: Error 70 typically requires replacement of the main control PCB by a Rinnai-authorized technician, followed by safety and combustion checks.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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