Dyson HP02 Displays solid E and power light flashes red

As the title states, my Dyson fan is displaying a solid “E” on the display and the power button is blinking red. I don’t have the remote (ordered one, waiting for it to arrive) but was wondering if anyone could help. I’ve tried Googling the issue and haven’t found anything helpful. I’m not afraid to disassemble and work on it (I like to tinker with electronics) but I’d like some pointers as to what the problem might be. Thanks!