Ricoh SC491 Error Code
Moisture has formed inside the machine, often after it was moved from a cold space into a warm office, or when room temperature swings sharply. The machine protects itself until conditions stabilize.
Environment
What This Means in Plain Terms
Moisture has formed inside the machine, often after it was moved from a cold space into a warm office, or when room temperature swings sharply. The machine protects itself until conditions stabilize.
Condensation on optics and sensors can look like a hardware failure. Ricoh operator manuals specifically call for waiting, not repeated resets.
Safe things you can try
- Turn the machine completely off.
- Leave it powered off for at least one hour so it can reach room temperature and any condensation can clear.
- Keep the machine in a stable indoor environment during that wait. Do not run heaters or fans directly into open covers.
- After an hour, turn the machine on once and wait for Ready.
Do not do these
- Do not keep turning the machine on and off while condensation may still be present.
- Do not open panels to wipe internal optics unless a technician directs you.
Never enter service mode or clear safety codes yourself. Those steps can damage the machine or leave a safety lock uncleared.
When to call for service
If the code is still present after a full acclimation wait and one clean power-on, schedule service.
Reference: Ricoh operator guidance for condensation / SC491. Guidance summarized for San Diego County offices; model details can vary.
All error codes· Troubleshooting checklist· IM C series models
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