Ciea metal detectors large metal fault issue.

Dear guys,
Today I have been installed 2 no of ciea metector model G21-200.now my problem is if I power on first metal detector & observed it is working good and if I power on for 2nd metal detector then first metal detector is not working.I mean at the same time only one metal detector is working.I am trying run both detector at same time but both are showing large metal fault.
If somebody has any idea kindly help me to solve my problem.
Kind regards.

Jamal.

Dear guys,
My metal detector problem has been solved. It was malfunctioning due to both metal detectors are near by each other. Finally I changed configuration mode transmission channel TX 2 before it was 1.now one m/c TX 1 and other m/c TX 2.
Both m/c is working fine.
Thanks all and best regards.
Jamal.