The investigation was performed based on the provided complaint and service information.We were informed that after replacement of the bacteria filter the reported problem was resolved.Although the fabius is equipped with two bacteria filters on different positions only the one installed in the vacuum line (inside the fabius control box) can cause, if blocked, a ventilator failure as reported.A blockage of this specific bacteria filter will lead to a high membrane vacuum finally exceeding the maximum value for automatic ventilation (approx.-250mbar).The vacuum pressure is necessary to maintain proper function of the ventilator piston diaphragm.As a precaution in such case the ventilator is stopped and a corresponding "ventilator fail" alarm is posted.As automatic ventilation is not possible anymore the user can switch to manual ventilation as described in the instructions for use.Monitoring is still functional.The affected filter is part of the yearly preventive maintenance.As the 4 years old fabius is not under draeger service contract and as no information was provided when the last maintenance was performed it is unknown when the bacteria filter was replaced the last time before the reported event took place.The fabius has reacted as specified for the detected situation and has posted appropriate alarms to inform the user.
|