Metre not working

My prepay metre has a blank screen and doesn’t show my balance.

My prepay metre has a blank screen and doesn't show my balance.

I am copying this from a Bulb article:

Blank display
The display turns itself off to save battery.
Press the red A button on the meter to wake up the display.

Please see: https://help.bulb.co.uk/hc/en-us/articles/360006306551-What-do-the-prepayment-meter-errors-mean-