... circuit still has malfunction, try several times, then must reset manually.♦Main Technique IndexO Current display range: 0~100A, ... C-AlarmCircuit protecting, Load opensCircuit protects ever, but already reset automaticallyG The meaning of the nixietube display:In normal, ... normal temperature state ,press “∧” “∨” during 3 seconds, if the password is right, the screen displays “Fxx”, "xx” is two numbers ...