3M Versaflo alarms

[SkyBlue63]

Hi all
Had my versaflo Tr-300 for a while (about 2-3yrs) , started getting alarms on battery and filter. Battery is fully charged and filter only just changed.
Anyone offer any thoughts or help.
Cheers Geoff

 

[Sideways]

If you run it with the filters completely removed, do the alarms stop ? And if you gradually restrict the flow by moving your hand across the end of the hose, does the fan ramp up to try and maintain airflow and then sound the alarm when you restrict it too much ?

Of course you can't use it this way but these tests will prove that the functions of the fan unit are working as intended, or not.
If it does work, then either the filter is restricting the airflow more than the old one used to, or the way the unit senses pressure has changed calibration.

 

[SkyBlue63]

I've removed the filters and the alarms still go off.
I haven't tried restricting the flow.