Well, if the H9 is flashing on and off regularly, that would indicate that it has a bad flash. But if it’s flashing on and off erratically, it does sound like it has a bad power socket and the power socket needs to be replaced.
With regards to the ‘No Alg’ message, could you try pressing the ‘Preset’ switch and turning the wheel?
Tried pressing preset and turning the wheel. Nothing. I think it must be the power because it won’t stay on.The slightest jarring of the pedal knocks it offline.