C06, C16, and C17 point to the relevant filter on compatible Hitachi units: dryer blockage, filter installation, or lint buildup. The code and model determine which access point to check.
| Code | Indicated check |
|---|---|
| C06 | Blocked dryer filter; also verify the supply required by the model. |
| C16 | Improperly installed lint filter. |
| C17 | Lint buildup. |
The associations come from the official Hitachi FAQ; check the manual for the location and type of filter installed in your unit.
Turn it off and let it cool before performing authorized maintenance. Remove lint only from user-accessible parts and reinstall them fully. A clean but improperly seated filter may leave the C16 condition unresolved.
Do not extrapolate the alert to the pump filter or open internal air or water ducts. If the message persists after cleaning or correctly reinstalling the indicated filter, request service.
Report which filter you serviced and which code returned; this helps confirm that the maintenance matched the indicated component.