Code: C-0639
Classification: PF: Heater low temperature abnormality
Cause:
1st tandem PF-703 dehumidification heater /3 (HTR3) low temperature software abnormality.
The temperature sensor /7 (TEMS/7) detects the heater temperature lower than 0 C a specified period of time after the heater is turned ON.
Measures to take when alert occurs:
The main body and the option stop immediately.
Estimated abnormal parts:
- Lower tray fan heater (HT-505)
- AC drive board /2 (ACDB/2: HT-505)
- PF drive board (PFUDB- PF-703)
Correction:
Turn OFF/ON the power switch (SW2) of the main body when releasing an abnormal condition.
Note: The message "Please call service" is displayed on the panel.
Solution:
- Check the connection between ACDB/2 and the noise filter of PF-703.
- Check the connector connection and the wiring between ACDB/2 and the fan heater, and repair it if any abnormality.
- Check the connector connection and the wiring between PFUDB and the fan heater, and repair it if any abnormality.
- Check the connector connection and the wiring between PFUDB and ACDB/2, and repair it if any abnormality.
- Check the temperature and the installation of the fan heater, and repair it if any abnormality.
- Replace the fan heater.
- Replace ACDB/2.
- Replace PFUDB.