Had same on an HEQ5 - the pinion for the Dec motor would spin inside the supposedly pressed and peened cog - poor QC by Synta. So,it'd whirr away, no movement.
Tasco replaced the motor gratis. Worked perfectly after that.
Blinking red light - mine ALWAYS does it when slewing, regardless of what power source I use - battery or mains. When tracking, it is steady.
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