Honeywell Galaxy Dimension mystery (moved)

Hi
Last night my keypad sounded (alarm off at the time) and it showed a fault of +RF Entrance Hall
It emitted a tone a few times before I entered my code to see the fault. It did it again this morning. Cant find this fault code in the manual. I think it relates to the wireless door sensor I have. On inspection, the sensor seems fine. Anyone have any idea what the cause may be? The system has been running fine for years and nothing has been altered recently.
Thank you

 

Try posting on the alarm section .....galaxy guy will shed some light on it ....but at a guess the hall wireless detector had some type of RF blocking ....? Wireless heating controller with low battery ?