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Hi Almost three years ago I installed a system at home (with a bit of assistance from this forum) based around a Scantronic 9651PD Panel; I also installed a number of Honeywell Is-215TQ Quad PIRs using FSL wiring. Zones have only one PIR connected. No modifications have been made and no works have been undertaken that might have interfered with the system since it was installed. At night, the system is part-set so that all the entrance doors and the ground floor are covered but the PIR on the first floor landing is excluded. Last night I attempted to part-set the system at bedtime as normal. The system beeped intermittently (as usual) as I crossed the hall and climbed the stairs (which is protected by Zone 4 PIR). However, the intermittent beeping continued after I passed the point where it normally stops. Even when, I was well clear of the Zone 4 PIR, the intermittent beeping continued. Then, instead of getting the short "double-beep" to confirm that the system was "part-set", I got an alarm situation. The Log reads: 23.03.00 Set Fail ZO4 [which is the hall PIR] 23.03.00 Burg ZO4 Restore 23.05.22 System Restore I have attempted to investigate the issue further this morning however I have encountered a rather odd problem (which may or may not be related): Some parts of the system seems to be working very, very, slowly. For example: when I open a door, the "chime" does not sound instantaneously as it used to - instead it takes anything from 10 seconds to several minutes to sound. When I attempt to set the system, I present the proximity tag and select my setting option but then the display returns to the "normal" unset display. Repeating several times does, eventually work. When un-setting the system, I present the proximity tag, the entry tone stops but I don't get the usual "double beep" to acknowledge it is unset. Instead, after the time runs out, I get an alarm condition. When viewing the alerts, the display takes some considerable time to return to normal after all alerts have been viewed. It is almost as if some parts of the system are running very slowly, so slowly in fact that time runs out on certain commands before the command is fully recognized and acted upon. [Finally (and this may simply be my memory at fault) I notice that the green mains light only shows when I am doing something (eg setting/un-setting, viewing logs etc). I thought it used to show continuously (except during mains failure).] Once again, any thoughts, advice or help would be greatly appreciated. Thanks.