If the detector is hard-wired, check the cabling and connections from the panel to the detector, and EOL resistor, especially if there is only one PIR on that zone.
Check the voltage at the PIR is 12-14VDC.
I have a DSC PC1565 Alarm System that has been going strong for almost 20 years that has developed a problem with a DSC PIR on one of the keypad zones.
The PIR on zone 7 triggers every 2 to 3 minutes but all the other pir's and door switches are still fine.
I thought the PIR must have gone bad so first thing I tried was replacing the PIR with a new Bosch ISC-BPR2-W12 Blue Line Gen2 PIR but it is doing exactly the same thing.
Have tried covering the lens on the new pir with paper but still get the same problem. Nothing else has changed in the room, it is my office and my wireless router (ASUS RT-AC68U) is in the room but it has been in there for years. Any thoughts on how to troubleshoot/fix this would be appreciated.
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If the detector is hard-wired, check the cabling and connections from the panel to the detector, and EOL resistor, especially if there is only one PIR on that zone.
Check the voltage at the PIR is 12-14VDC.
argus357 (10-10-19)
Yes, only one PIR on the zone, I moved the EOL resistor from the old PIR to the new but did not check its value so will do that tonight. Voltage at PIR was just over 13VDC from memory but will check it again. I also checked and tightened connections at both ends, they did not appear to be loose. Cabling comes down the wall cavity to the PIR so can't really check its condition easily.
Edit: You made me think, I haven't checked the zone connection at the keypad yet, only the cable join in the panel from the PIR and the keypad so one more thing to check tonight.
Last edited by argus357; 10-10-19 at 12:43 PM.
You haven't enabled chime on that zone accidentally have you?
Easily done. Hold the chime button down.
Time for a new panel with features..
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Did all the checks mentioned above and everything looks fine.
Some Googling led to people discussing wifi interfering with PIR's connected to RPi's and Arduinos, at my wits' end I stuck the router under the desk and believe it or not the triggering every 2 minutes stopped.
It then clicked I had upgraded the router firmware at around the same time as the problem started. Rolled back to the previous firmware, put the router back on the desk and (touch wood) the PIR has not triggered for the last hour.
Well Done
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