521 won't fire

if I screw my unit in all the way the 521 will not read or fire back the unit out some and it works but the read goes all over the place is a new unit ? Any suggestions 


  • Sorry for this inconvenience.

    Could you please send a picture or short video for this issue to our customer service center : support@coil-master.net ? We will feedback to our engineer for investigate . 

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