This fault applies to non-IBC operation only. When this fault occurs, it means the system deflate time was exceeded. Maximum deflate time is configurable and is typically set to 15 minutes. This is not a critical fault. If it occurs frequently, check your air flow path between the pneumatic controller and the die for clogs. Note that a partially clogged air flow path will still allow inflation to work satisfactorily, but will restrict deflation flow to the point that it appears not to be working. You should also replace the pneumatic box filter located in the blue canister if it has been 6 months or more since you last changed the filter and you have been running the unit regularly during that time.