Ricoh D117 Service Manual page 384

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Temperature and humidity sensor error
The thermistor output of the temperature sensor was not within the

prescribed range (more than 0.76V to less than 2.90V).
The thermistor output of the humidity sensor was not within the

prescribed range (2.4V or more).
498 C
Temperature and humidity sensor harness disconnected, loose,

defective
Temperature and humidity sensor defective

1. Check the connector and harness.
2. Replace the temperature and humidity sensor.
SM 6-23
SC Tables
D117/D118