Hi. I'm having same problem with the dwv902m. Tried looking for the causes of continious alarms. noticed, that when the extractor has no hose attached, it works fine. But when the hose (any size) is attached, the alarm starts in a few seconds. Some guys here mentioned "Y" connector. There's no such original part with this model, trying to adopt something to work sounds a bit wrong (because machine is not designed/created to work with self-made/adopted connectors). I'm using various power tools (mitre saw, plunge saw, planner, router) plugged into extractor, the machine is almost brand new, though this alarm problem started after few days of usage. First, I have ignored it, though tried looking for solutions online, but when started working in close quarters (smaller rooms), the sound is too loud to be ignored anymore.
Would appreciate on any advise.