Radionics D7214G Ground fault detection

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I have a customer with a D7412G, doesn't appear to detect ground faults
Ground fault detection is enabled by the little wire switch under terminal  
The ground is good, but I can leave a jumper on all day from ground to any  
of the terminals that are supposed to detect a GF with no fault detected.
I tried a different panel with the same results, as far as I can tell there  
are no program options for ground fault detection, just the wire switch
The first panel was version 6.10, the second 6.40 according to the manual  
any version 6.10 or higher should work.
Anyone have ideas what could be wrong, is there some option I am missing? I  
can't imagine that both panels are bad, they both appear to work in every  
other respect

What am I missing, it should be simple but for some reason I'm struggling.


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