Digital protector not working properly needs attention (Dodleston CH4)

Our community charity has found this digital protector to not be reliable I'm afraid. Sometimes it seems to not pick up the input although I think this can be a glitch that might not be insurmountable. But last time we used it the picture was blurred and it wasn't really usable.
Maybe someone can make it work properly and can use it?
Collection would be from Dodleston.
Thank you Nicola

       
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