The master code is 654321 i know it sound silly but thats the default code out of the factroy if that does not work then the engneer that put the unit in has changed the code
Default your panel to factory code and the master code will come back to 1234
SOURCE: GE simon 3 security system How to reset master code?
The default master access code is 1-2-3-4, try it to see if this works.
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