I have a large home with a KX-TA624 system, several KX-T7030s, KX-T7135s and three cordless KX-TD7895s.
Two of the cordless phones work fine. The remaining phone gives a dial tone when I press the blue "PHONE" button (and I can press 9 for an outside line), but the "Flexible keys" F1 and F2 do not pick up one of the two outgoing COs. Also, the INT (intercom) button does not pick up so I can dial an intercom number. These functions work fine on the other two phones.
I do have the ability to program the KX-TA624. Can you provide any tips on what might be wrong?