92
Rinnai
Combustion Feedback or Fan/Gas Valve Coordination Fault
Boiler intermittently displays error 92; may occur during modulation or when demand changes rapidly.
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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
Incorrect combustion tuning, Faulty fan speed control, Gas valve modulation error, Control PCB combustion algorithm fault
How to Fix / Troubleshooting
Safety first: Isolate power and gas. Abnormal combustion faults must be addressed by trained personnel.
- Check venting: Ensure vent lengths and configurations are within Rinnai specifications and that terminations are unobstructed.
- Observe operation: With a technician present, observe fan speed and flame behavior during modulation to identify instability.
- Combustion tuning: A qualified technician should perform a combustion analysis and adjust gas valve offsets or replace faulty components.
- PCB evaluation: If mechanical components test good, the control PCB may require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Combustion Control System
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