Last year my Red Cube went inop so I tried the “flush” and no movement. While on the phone with Dynon support I blew through the Cube in the direction of flow. You will hear a Gazoo type sound and an immediate view into the passage you may see the very small impeller still turning. Mine did not so I bought a new one. Do not use compressed air to blow through the Red Cube.
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold